Troubleshooting your Dometic thermostat can help resolve a number of issues that it may have. It should be the first thing to try before calling service since in some instances the problems are not that complicated. They would quickly clear after performing simple troubleshooting procedures. We have given the various steps for troubleshooting common problems with these thermostats, as well as how to perform various operations.
How Do I Reset My Dometic RV Thermostat?
To reset the thermostat:
- Make sure the Single Zone LCD thermostat is in the Off Position.
- Press the + button and, while holding it, also press and hold the On/Off Mode button for 3 seconds.
- The LCD will show –, press the On/Off Mode again to turn system off. This completes the system initialization.
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How Do I Reset My Dometic 5 Button Thermostat?
- Turn the switch off.
- Now at the same time press both the mode and zone buttons while turning the switch back to ON.
- The letters FF should appear in the digital display as you are doing that, and will remain there until you release both the zone and mode buttons.
- Hold the zone and mode buttons until these letters appear, then release the buttons when they do. Your system should be reset and ready to work.
- All Dometic Thermostat Error Codes and Their Meaning
- Dometic thermostat displays various codes to indicate the status or an issue with the system.
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The following are the various error codes
E1– Loss of communication between the thermostat and all system power module boards. System will shut up.
E1– Loss of communication between the thermostat and an individual system power module board. The LED will display will display error code “E1” and the zone number that lost communication. Any additional zones that lose communication will blink in addition to the current zone.
E2– Open circuit or out-of-range Indoor Temperature Sensor. All heat and cool operation will be locked out. Manual fan operation will continue.
E3– Shorted Indoor Temperature Sensor. All heat and cool operation will be locked out. Manual fan operation will continue.
E4– Open circuit or out-of-range Outdoor Temperature Sensor. Heat pump operation will be locked out. Air conditioner, furnace, heat strip, and fan operation will continue to operate.
E5– Open circuit or out-of-range Freeze Sensor. Air conditioner operation will be locked out. Heat pump, furnace, heat strip, and fan operation can continue to operate but displays the last temperature set-point.
E7– Loss of 120 Vac power to all power module boards on the system. The system will shut down.
E8– Invalid zone configuration. The heat pump and heat strip DIP switches are both set to the ON position in one zone. Heat pump, heat strip and air conditioner operation will be locked out in the affected zone.
E9– Invalid zone configuration. The dehumidifier DIP switch and either the heat pump or heat strip DIP switches are set to the ON position in one zone. Heat pump, heat strip, and air conditioner operation will be locked out in the affected zone.
Common Dometic Analog Thermostat Problems and How to Fix Them
Wiring problem
- A wiring problem can sometimes be the reason your thermostat is not working or doesn’t work as it should.
- To troubleshoot this problem, start by taking a voltmeter and checking if the thermostat is receiving any power at all. If there is no current flowing into the device then this likely points to a problem with the wiring.
- You will need to establish where the wiring might be damaged by using a voltmeter or tester. If you are a DIY guy you can then fix on your own, but if not, have the wires fixed by a professional.
AC or heat is non-responsive
If your AC or heat will not turn on or not turn off, this might indicate that there is an issue with your thermostat. For an analog thermostat move the slider well past the current temperature in the direction you want the temperature to go. If you do not hear an audible “click” then it is likely your thermostat is the problem. The “click” is a relay closing sending a signal to your heater or AC that it is time to turn on. You should also hear a “click” when your room temperature has come to the correct temperature +/- one or two degrees Fahrenheit or there about.
If you hear a “click” sound it is possible your thermostat may not be the issue. You can continue troubleshooting your thermostat to confirm it is not the problem.
How Do I Reset My Dometic Comfort Control Thermostat?
Performing a system reset on your Dometic Comfort Control thermostat restores the factory default settings. In the event of system memory loss or dip switch setting change, the thermostat will require a system reset.
System reset on a Dometic Comfort Control thermostat, follow these steps:
- Make sure the thermostat is in the OFF mode.
- Then, simultaneously press the MODE and ZONE buttons. The LCD will display “IniT” and all available zones.
- Release the MODE and ZONE buttons.
- Press the ON/OFF button to exit system set up.
- How to Turn Dometic Comfort Control Thermostat ON/OFF
- To turn ON Dometic Comfort Control Center (CCC 2) thermostat when the back light is OFF.
- First press any button to wake up the thermostat.
- Then press and release the ON/OFF button. The LCD will display the last programmed settings.
To turn OFF the CCC 2 thermostat:
- Press the ON/OFF button and release.
- Only the time of day will display when the thermostat is in the OFF condition.
- How to Tell If Your RV Thermostat is Bad.
- There are several signs that you can look for to tell if your RV thermostat is not working properly or not working.
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