Dometic Thermostat E4 CodeAir conditioner mode of operationwill be locked out. Action: Check White plug is connected on main board. An E-4 error is an out of range outdoor temp sensor and ONLY applies to a heat pump model. It is usually Continue reading Troubleshooting Dometic 3 Button Thermostat Problems (Guide). 0:00 6:02 Dometic RV Thermostat Replacement 2manytoyz123 946 subscribers Subscribe 35K views 3 years ago Today I replaced the thermostat in our travel trailer. On cooling, the thermostat may be set too cold or supply air may be short cycling causing the evaporator coil to freeze: Check thermostat setting and/or redirect supply air so that it is not directed into the return air stream. If this 2-pin connector is loose you can get an “E4” error code. The E4 fault indicates that the unit is going into defrost mode, and somehow it causes your unit to malfunction, and the result is the system gets too cold. • Simultaneously press and hold the MODE and ZONE buttons. Dometic 3313192 thermostat troubleshooting. E2: Open circuit or out of range Indoor Temperature Sensor. If you are under warranty do not touch the system. Dometic Furnace Thermostat (Heat Only) - Black. FAQ, Product Manuals & Brochures. " Open circuit or out of range Outdoor Temperature Sensor (select models). It may be best to call Dometic to get feedback on the code and its meaning, before replacing parts. (As noted in post above E4 is a defective outdoor temp sensor. You need to remove the shrouds on each A/C unit to get to the telephone jack blocks. The "smart" thermostat is telling you that the Outdoor Temp sensor is open or bad (i. There is the chance that a defective temperature sensor causes your AC to go into defrost mode. Clock Setting Press the CLOCK button to initiate the clock setting sub-menu on the CCC 2 ther-mostat. The code should contain the zone that has lost communication and that information should appear on the display screen. 000_B) ©2016 Dometic Corporation LaGrange, IN 46761. Air Conditioner, Fan and Furnace operationcan continue to operate. Came back to my 3731FL to find the error code flashing. This unit cannot be serviced. We recently purchased a 2018 Reflection 337 RLS. INTRODUCTION This Capacitive Touch thermostat (hereinafter referred to as “CT thermostat” or “product”) is designed and intended for use in a Recreational Vehicle (hereinafter referred to as RV). Posts: 3,990. An E4 error is shown when the distance detected between the open and closed positions of the valve is too short. Have looked at manuals, checked the online archives and find no. We don't have an outdoor temperature sensor. In hot climates, it is vital to have a way to cool your home. Brief troubleshooting guide for the Dometic CCC2 dual AC “E1 error” issue: Issue. all sudden the remote will not + - the temp settings changed batteries and nothing. Today the Dometic thermostat started reporting code E4, which means outdoor air temperature sensor fault. Dometic support will ask for the mfr number (on the label). Our thermostat was replaced for this issue at the Rally last year, and we have camped for 3 to 4 weeks since then. You may also get it if there is a problem with the Penguin II control board. In many cases, there is nothing wrong with the device. Switch unit into heat until the ice melts. Fan operation can continue to operate. For system reset procedure, see main heading, “System Reset Procedure” on page (19). My dometic ac is showing an E4 code. The E4 fault indicates that the unit is going into defrost mode, and somehow it causes your unit to malfunction, and the result is the system gets too cold. However, there is a second E4 code and it is for the Dometic CCC 2 thermostat. The E4 code for the Dometic 3313192 thermostat is as we reported earlier. There are home warranties that cover mini split air conditioners and electronics policies that cover portable air conditioners. Air conditioner thermostat is flashing E4 code with temperature. HeatPump operation will be locked out. E4 is a fault in the outside temp display. RV Mechanic: Randall Ask Your Own RV Question it runs the A/c and heater single zone standard That usually is an indication of the thermostat failing as this model. It has also thrown anE3 read more Robert RV Mechanic Vocational, Technical or. I suggest locating a qualified technician as it can be a difficult process. By 2hams in forum General Tech Topics Replies: 9 Last Post: 09-05-2018, 10:48 AM. It says the same thing except it adds that the dehumidifier feature will be locked out as well. E4 error code on Dometic Thermostat. This problem needs to be tracked down as a wire or two may be loose or disconnected, broken, or corroded in some way. E4 = Outside temperature sensor is out of range. Came back to my 3731FL to find the error code flashing. Press the Power / Mode button on the CT Bluetooth thermostat until you reach OFF. An E4 code on your Atwood Air Command Rooftop RV Air Conditioner # AT15027-22 most likely indicates low refrigerant, the compressor is not running, or the thermistor is out of calibration. The E4 error code does not signify what is causing the unit to freeze or get too cold to operate without causing damage. Today the Dometic thermostat started reporting code E4, which means outdoor air temperature sensor fault. [updated 1/24/2018: Legal disclaimer added]In this Tech Tips video, Jeff explains what the E0 and E4 error codes mean, possible causes and some ways to resol. It has several features that are fairly easy to understand and a few features that need more. Yes we are going to fix it ourself. • Release the MODE and ZONE buttons. The fix here is a new thermostat. Single Zone CT Control kit for Cool/Furnace modes, White thermostat included. The E4 fault indicates that the unit is going into defrost mode, and somehow it causes your unit to malfunction, and the result is the system gets too cold. Our front air is showing an E4 code. I think resetting the thermostat will correct it. How can we help? Help me find the right product. Dometic Furnace Thermostat (Heat Only) - White. 10,500 BTU Under Bunk Air Conditioner, Non-Ducted Application. Home | Forest River Inc. If it's below 40 (F) outside and you are using the Heat Pump function, it's too cold for your heat pump to operate. This code is telling you that the thermostat cannot talk to the other components and get your AC unit working. It happens so often I think there must be a loose connection where the data cables to the 15,000 BTU unit and the 13,500 BTU unit where they are connected. • The LCD will display “IniT” and all available zones. Heat pump and dehumidification operation will be locked out. There is no external thermometer on a Montana so the E4 code is likely related to the thermostat having gone off the rails. I did find the definition, as an open circuit or out of range outdoor temperature sensor. Dometic 3313192 thermostat troubleshooting. The A/C unit is a Dometic. Use these instructions to ensure correct installation, function, and operation of product. Dometic CT Single Zone Thermostat Control Kit. Dometic 3313192 thermostat troubleshooting Dometic CCC 2 thermostat troubleshooting Code Description; E1: E4: Open circuit or out of range Outdoor Temperature Sensor (Select Models). In this video, we will look at the Dometic CT Single Zone RV Thermostat that comes in many RVs. 31K subscribers Subscribe 29K views 3 years ago A video outlining the use and common. Once modern technology got involved, electronic devices got far more complicated than they should be. Today the Dometic thermostat started reporting code E4, which means outdoor air temperature sensor fault. This discussion is proudly sponsored by: Please support our sponsors and let them know you heard about their products on iRV2 Thread Tools Join the #1 RV Forum Today - It's Totally Free!. I guess if the car won't start because it's too cold why not the heater. According to his profile, the OP has a 2018 model. INTRODUCTION This Capacitive Touch thermostat (hereinafter referred to as “CT thermostat” or “product”) is designed and intended for use in a Recreational Vehicle (hereinafter referred to as RV). Does anyone know how to remove the inside cover on the Dometic Penguin II units? I am continually getting an E1 code. Use a spanner or a similar tool to move the pin in and out to unblock the valve. On cooling, the thermostat may be set too cold or supply air may be short cycling causing the evaporator coil to freeze: Check thermostat setting and/or redirect supply air so that it is not directed into the return air stream. The "E1 error" - which is common - occurs when there is either a disruption in the communication from one or more of these cables, OR if there is a problem with the Dometic Penguin II AC control board itself. To learn more about this part and its location and purpose, just continue to read our article. Tech Tips: How to Resolve the E0 and E4 Error Codes (L) Mitsubishi Electric Trane HVAC US 23K subscribers Subscribe 266K views 5 years ago Tech Tips [updated 1/24/2018:. dometic AC unit & remote have been working fine since we bought 2005 keystone montana Jan 2016. Does anyone know how to remove the inside cover on the Dometic Penguin II units? I am continually getting an E1 code. 0:00 / 3:08 Tech Tips: How to Resolve the E0 and E4 Error Codes (L) Mitsubishi Electric Trane HVAC US 23K subscribers Subscribe 266K views 5 years ago Tech Tips [updated 1/24/2018: Legal. You may need to press and hold the RV thermostat’s zone and mode buttons simultaneously. Our thermostat was replaced for this issue at the Rally last year, and we have camped for 3 to 4 weeks since then. To reset the thermostat, follow these steps: Turn off the power to your RV or camper’s HVAC system. To learn more about the E7 error code and how to fix it just continue to read our article. Arrive, plug into 50a and Turn ACs on. This problem needs to be tracked down as a wire or two may be loose or disconnected, broken, or. To connect to a Bluetooth® device from the Dometic CT Bluetooth app, choose Add New Connection. Checking for a blown breaker is one way to fix this issue. Make sure the CCC 2 thermostat is in the OFF condition. In your case, I bet you will see zero volts. (Thermostat E4 Code) RV Air Conditioner / By James V. Page 2 TECHNICAL MANUAL for IBIS ROOFTOP CARAVAN AIRCONDITIONER ERROR CODES & THEIR MEANING: E1: Room sensor fault. Is not a v tried with shore power, generator power and disconnected all with same result. , A Berkshire Hathaway Company. What Happens When Your AC Goes Into Defrost Mode?. This code is telling you that the thermostat cannot talk to the other components and get your AC unit working. • Press the ON/OFF button to exit system set up. E4 Open circuit or out of range Outdoor Temperature Sensor (select models). Dometic air conditioner error codes When a Dometкм rv air conditioner is experiencing an issue, most of us are tempted to request a service engineer visit. What red wire bypass are you referring to get the compressor to kick in, and is it gonna hurt the unit?. 5K BTU Single-Zone Air Conditioner w/Heat Pump - Black. 501 Installation Instructions Manual. Heating and cooling operation will be locked out. See page 3, Quick reference to control buttons. Remove the thermostat’s cover to access the reset button. If it is apparent that the compressor is running, then check the temperature differential across the evaporator by measuring the temperature of the return air at inlet. Dometic thermostat displays various codes to indicate the status or an issue with the system. Dometic thermostat error E4 iRV2. My Dometic thermostat is giving a code of E4. My Dometic thermostat is giving a code of E4. I was told it had Answered in 5 minutes by: RV Mechanic: Ask Your Own RV Question Good morning! Thank you for bringing your. Air conditioner, furnace, heat strip and fan operation can continue to operate. Dometic Corporation 46 Zatonski, Unit 3 Brantford, ON N3T 5L8 CANADA Service Center Dealer Locations Please Visit www. Today the Dometic thermostat started reporting code E4, which means outdoor air temperature sensor fault. If it's a CA1000, Error code E4 states the following. Dometic Corporation 46 Zatonski, Unit 3 Brantford, ON N3T 5L8 CANADA Service Center Dealer Locations Please Visit www. The E1 error code is indicating that one of the 4 cables used to connect the thermostat to the dual AC CCC2 system has lost communication with a sensor or control board. Thermostat E4 code. The RM3662 has a method to check the Dometic thermostat which regulates the fridge Use the control panel 'TEMP. I’ve had some minor issues with it, but it continues to work and blow cold air, as it should. code is On; code is On; HTML code is Off; Forum Rules. Our thermostat shows an E4 code on it. E4: Indicates either a lack of refrigerant, the compressor is not running, or the thermistor is out of calibration. The thermostat threw a code of an E4 and we changed the adaptor we were using and it seemed … read more Wayne Grand Pa Vocational, Technical or Tra 3,330 satisfied customers Want to know if a dometic awning number 926p121. E4 Open circuit or out of range Outdoor Temperature Sensor (Select Models). Usually a faulty connection (plug), damaged lead or a faulty sensor itself. I remember seeing this problem before, but darned if I can find it. Dometic fridge showing E4 error dc out of range. Does anyone know the meaning and what the solution might be? FYI, Dometic owns Atwood but for some reason their manuals do not show that. Use this setting and the Dometic Service Manual Repair Specification. Press and hold the reset button for 10-15 seconds. Dometic Thermostat E4. E4 Open circuit or out of range Outdoor Temperature Sensor (select models). com Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts. Self-contained air conditioner & heat pump for recreational vehicle (16 pages) the The Comfort Control Center configuration relates to setting thermostat wires are attached to the two (2) blue wires from the dip switches and. The E1 code may signal a communication issue between the indoor unit and the fan/condenser unit, which is outside. The RM3662 has a method to check the Dometic thermostat which regulates the fridge Use the control panel 'TEMP. The dometic thermostat can tell you temperature in the room. An E4 error is shown when the distance detected between the open and closed positions of the valve is too short. 301ul will fit 2016 forest river work and play ultra bumper tow. This code is telling you that the thermostat cannot talk to the other components and get your AC unit working. E4 error code on Dometic Thermostat. Air Conditioner Dometic 39626. Open circuit or out of range Indoor Temperature Sensor. In case of a minor malfunction you may diagnose the problem by an error code. RV Dometic "soft touch" thermostat - YouTube 0:00 / 3:15 RV Dometic "soft touch" thermostat MR RV TECH 7. Review settings below and adjust the settings to your personal comfort level. E4 = Outside temperature sensor is out of range. This is a Dometic Single Zone thermostat. E4 Open circuit or out of range Outdoor Temperature Sensor (Select Models). The following are the various error codes and what they mean: E1- Loss of communication between the. We don't have an outdoor temperature sensor. Air condi-tioner mode of operation will be locked out. Dometic thermostat displays various codes to indicate the status or an issue with the system. E5 Open circuit or out of range Freeze Sensor. That loss of power is for all power modules connected to the system. The Dometic thermostat is one such device. the thermostat setting, or if one changes the setting to '3', and then wait 5 seconds, the cabinet temperature is displayed. This is a good point since the E4 code may actually be reporting a real issue. Front AC thermostat flashes E4 and the fan runs but compressor will not kick on. The thermostat threw a code of an E4 and we changed the adaptor we were using and it seemed … read more Wayne Grand Pa Vocational, Technical or Tra 3,330 satisfied customers Want to know if a dometic awning number 926p121. Dometic Cool Cat - 10. my Dometic air conditioner control is flashing error E4 There is power to the unit as the fan still runs but does not produce cold air. Code Description; E1: Loss of communication between the Single Zone LCD thermostat and the module board. We don't have an outdoor temperature sensor. If you only have two units, one of the jack on unit 2 should be open. On Heat Pump systems, the heat pump has an ambient outdoor sensor and they use THAT sensor to give outside temps on the wall display The ORIGINAL installs from a few years ago when this system was new, they installed a few ambient sensors on regular AC units to give that temp display. ) If your unit does not have a temp sensor, the error code is probably due to a bad main board - PN 3313107. An E4 error code indicates a non-repairable, non-serviceable refrigerant leak (confirmed per Dometic's technical support line). My dometic ac is showing an E4 code. The freeze sensor (mounted to the condenser fins) has 2 wires that plug into the control module box at the front of the air conditioner unit. Loss of communication between the Single Zone LCD thermostat and the module board. I also have a E4 issue on a Georgetown GT5. Heat Pump operation will be locked out. Other operations like Air Conditioner, Fan and Furnace operation continue to operate. Check resistance of thermistor & cable by measuring with a multimeter. E4 = Outside temperature sensor is out of range. However, it is not always necessary. You may need to press and hold the RV thermostat’s zone and mode buttons simultaneously. Ask an Expert Car Questions RV Questions ★ Air conditioner thermostat is flashing E4 code with Ask Your Own RV Question Ask Your Own RV Question RV Mechanic: Ask Your Own RV Question Randall, RVIA Certification. 0:00 / 3:08 Tech Tips: How to Resolve the E0 and E4 Error Codes (L) Mitsubishi Electric Trane HVAC US 23K subscribers Subscribe 266K views 5 years ago Tech Tips [updated 1/24/2018: Legal. BTW, my front A/C unit will come on and work but when I change the thermostat to HP ( heat pump) the unit will not come on and I get the flashing E4 code! 03-26-2019, 01:56 PM # 3. When you see this code, the system is telling you that all 120 AC power has been lost and the system cannot operate as it should. Maintenance, upgrade or service. To reset the thermostat, follow these steps: Turn off the power to your RV or camper’s HVAC system. A unit low on refrigerant charge will cause evaporator icing. You can use the old control board as that is the same one for most models. This code is telling you that there is a lack of communication between the CCC 2 thermostat and the power module boards or an individual power board module. This can be an indicator that the radiator valve is blocked by calcification. my Dometic air conditioner control is flashing error E4 There is power to the unit as the fan still runs but does not produce cold air. My dometic ac is showing an E4 code. 301ul will Want to know if a dometic awning number 926p121. (Thermostat E4 Code) RV Air Conditioner / By James V. The E4 error code does not signify what is causing the unit to freeze or get too cold to operate without causing damage. It will be real inconvenient to take it to Camper. The air conditioner mode of operation will be locked out. Related Manuals for Dometic 3109228. There are home warranties that cover mini split air conditioners and electronics policies that cover portable air conditioners. Air Conditioner, Fan and Furnace. I cannot find that information in any of the booklets we received with our Ask an Expert Car Questions RV Questions Answered in 13 minutes by: RV Mechanic: Randall Ask Your Own RV Question Single zone RV Mechanic: Randall Ask Your Own RV Question RV Mechanic: Randall Ask Your Own RV Question. Rear temp sensor (behind rear TV) and Rear AC. com CAPACITIVE TOUCH THERMOSTAT MODEL COOL/FURNACE 3316410. If it is apparent that the compressor is running, then check the temperature differential across the evaporator by measuring the temperature of the return. “E4” refers to the freeze sensor located in the air conditioner on the roof of your RV. The E4 error code does not signify what is causing the unit to freeze or get too cold to operate without causing damage. Dometic Corporation 2320 Industrial Pkwy. “E4” refers to the freeze sensor located in the air conditioner on the roof of your RV. Elkhart, IN 46516 Phone: 574-294-2511 825127003 ©2006-2007 Dometic Corporation LaGrange, IN 46761 ® WARNING 2320 Industrial Parkway Elkhart, IN 46516 For Service Center Assistance USER manUal REfRigERatoR foR lP-gaS & ElEctRic oPERation POUR vOTRE SéCURITé Si vous sentez une odeur de gaz: 1. The following are the various error codes and what they mean: E1- Loss of communication between the thermostat and all system power module boards. What is the E7 code on a Dometic thermostat? When you see this code, the system is telling you that all 120 AC power has been lost and the system cannot operate as it should. If you are electrically trained, this can be measure using a digital volt meter. E4: Indicates either a lack of refrigerant, the compressor is not running, or the thermistor is out of calibration. To reset the thermostat, follow these steps: Turn off the power to your RV or camper’s HVAC system. It flashed E4 and the set temp back and forth, on air and heat. There is the chance that a defective temperature sensor. Dometic support will ask for the mfr number (on the label). Air condi-tioner, furnace, and fan mode of operation can continue to operate. Furnace Thermostat. What does E7 mean on power XL fryer?. How can we help? Help me find the right product. E4 is a fault in the outside temp display. Any time the CCC 2 is in an idle stage (not illuminated) you will need to. Or one of the other components or the thermostat has gone bad. RV Dometic "soft touch" thermostat - YouTube 0:00 / 3:15 RV Dometic "soft touch" thermostat MR RV TECH 7. Air conditioner, furnace, heat strip, and fan operation can continue to operate. You don't mention what model of Dometic AC you have. CCC 2 thermostat will require a system reset. Have a 2019 GT5 31L5 and the thermostat for the front a/c is flashing E4. Have looked at manuals, checked the online archives and find no reference to this error. When in this menu, the hour digits will flash first. This code is telling you that there is a lack of communication between the CCC 2 thermostat and the power module boards or an individual power board module. My Dometic thermostat is giving a code of E4. Unfortunately we are in MYrlte Beach were it is gonna be 85 degrees today. An E4 code on your Atwood Air Command Rooftop RV Air Conditioner # AT15027-22 most likely indicates low refrigerant, the compressor is not running, or the thermistor is out of calibration. LCD will cycle between E1 and the previous mode setting. BTW, my front A/C unit will come on and work but when I change the thermostat to HP ( heat pump) the unit will not come on and I get the flashing E4 code! 03-26-2019, 01:56 PM # 3. Last night, for the second time, it began giving the “E4” code. BTW, my front A/C unit will come on and work but when I change the thermostat to HP ( heat pump) the unit will not come on and I get the flashing E4 code! 03-26-2019, 01:56 PM # 3. The E1 error code is indicating that one of the 4 cables used to connect the thermostat to the dual AC CCC2 system has lost communication with a sensor or control board. Page 2 TECHNICAL MANUAL for IBIS ROOFTOP CARAVAN AIRCONDITIONER ERROR CODES & THEIR MEANING: E1: Room sensor fault. This discussion is proudly sponsored by: Please support our sponsors and let them know you heard about their products on iRV2 Thread Tools Join the #1 RV Forum Today - It's Totally Free!. com Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts. The E4 code has nothing to do with the Oasis unit, but with the heat pump/AC unit located on the rear roof of your coach. it runs the A/c and heater single zone standard That usually is an indication of the thermostat failing as this model has no outside temp sensor and that is what the E-4 error code is for. The E4 code for the Dometic 3313192 thermostat is as we reported earlier. Plug the test cable into this and the other end into the telephone jack. E4 Open circuit or out of range Outdoor Temperature Sensor (select models). If it begins with 64 that indicates that it does not have a heat pump. it runs the A/c and heater single zone standard That usually is an indication of the thermostat failing as this model has no outside temp sensor and that is what the E-4 error code is for. To display it the thermostat must be OFF then hit either the up or down arrow. Its duty is to make sure those coils do not freeze. 2018 Ask an Expert Car Questions RV Questions My dometic ac is showing an E4 code. There is a sensor for everything. I was told it had something to do with the outside temperture sensor. I see this happen fairly often. If you've run through the list of generic procedures to clear the E1 code on your two-part unit with no success, it's probably time to call a pro. If you only have two units, one of the jack on unit 2 should be open. Dometic air conditioner error codes When a Dometкм rv air conditioner is experiencing an issue, most of us are tempted to request a service engineer visit. The correct location for the AC freeze sensor is halfway up the coils on the left-hand side. You don't mention what model of Dometic AC you have. Your Dometic CCC 2 thermostat has been pre-programmed. Enter the 2-digit code that appears on the CT. Enter the 2-digit code that appears on the CT Bluetooth thermostat LCD twice in the Device Authentication window of the app and choose Enter. Dometic thermostat error E4 iRV2. Error Code E4 06-05-2019, 06:47 PM I have a Dometic 15,000 btu single zone air conditioner. This unit cannot be serviced (recharged) by your dealer; the entire unit rooftop AC unit must be removed and replaced. E4: Indicates either a lack of refrigerant, the compressor is not running, or the thermistor is out of calibration. The hour can be adjusted using the ∧ or ∨ buttons. If they do, you could damage your AC unit and have to replace it. The "smart" thermostat is telling. Diagnosing this requires specialty tools and knowledge of HVAC wiring that few. XXX COOL/FURNACE/HEAT STRIP COOL/FURNACE/HEAT PUMP REVISION B Form No. Ray _____ 2020 Georgetown GT5 34H5 Tags: thermostat:. Found this online which may indicate a problem depending on the unit or an issue with the initial setup of the thermostat. Action: Check that the compressor is running by listening. Or it may not shut the AC unit off. I cannot find that information in any of the booklets we received with our Ask an Expert Car Questions RV Questions Answered in 13 minutes by: RV Mechanic: Randall Ask Your Own RV Question Single zone RV Mechanic: Randall Ask Your Own RV Question RV Mechanic: Randall Ask Your Own. Press the Power / Mode button on the CT Bluetooth thermostat until you reach OFF. Dometic E4 Code on Front Air. Select your CT Bluetooth thermostat from the list that appears on the app and choose Pair With Selected Thermostat. The E4 code has nothing to do with the Oasis unit, but with the heat pump/AC unit located on the rear roof of your coach. There are home warranties that cover mini split air. swoyer Well-known member Dec 11, 2020 #3 Dane, That's actually funny! It's so cold the heater won't work. (As noted in post above E4 is a. Dometic RV Thermostat Change From Celsius to Fahrenheit According to Dometic, the way to change your thermostat reading from Celsius to Fahrenheit is to press both the up and down buttons at the same time. XXXXXXXXX Answered in 6 minutes by: RV Mechanic: Michael Reush does your thermostat look like this? Ask Your Own RV Question RV Mechanic: Michael Reush. Only the time of day will display when the CCC 2 thermostat is in the OFF condition. An E4 code on your Atwood Air Command Rooftop RV Air Conditioner # AT15027-22 most likely indicates low refrigerant, the compressor is not running, or the thermistor is out of calibration. Yes, here is the exact description of the E4 error code from the Dometic Manual: E4 Open circuit or out of range Outdoor Temperature Sensor (select models). The Dometic thermostat is one such device. Remove the thermostat’s cover to access the reset button. Most Dometic furnaces will cap out at 90 degrees F which is roughly 30 degrees C. E4: Open circuit or out of range Outdoor Temperature Sensor (select models). Only the time of day will display when the CCC 2 thermostat is in the OFF condition. An E4 error code indicates a non-repairable, non-serviceable refrigerant leak (confirmed per Dometic's technical support line).