I have a Dometic 15,000 btu single zone air conditioner. I’ve had some minor issues with it, but it continues to work and blow cold air, as it should. Last night, for the second time, it began giving the “E4” code. It flashed E4 and the set temp back and forth, on air and heat.
I couldn’t recall how I corrected it last time, or if it corrected itself. The ac continued to work. I then read several posts on the internet by fellow owners that had, and maybe solved the issue by various procedures. This error code indicates an open circuit, having to do with the heat pump. Since I do not have a heat pump, the ac continued to work. I tried doing a reset on the thermostat, and the screen began to freak out a bit. Then the ac wouldn’t shut off. I removed the outer cover and turned it off with the inner posts. I left the cover off the rest of the night.
Today, I tried another suggestion. I turned off all electricity, 120 and 12v. The thermostat works off of 12v. After a couple of minutes, I turned everything back on, then I put the thermostat cover back on (I was willing to leave it off if I needed to). I turned on the air conditioner, and everything is working well with no error code.
I suspect that the culprit in this case is the thermostat. I will be looking into replacing it. I have the three button, black, square thermostat.
I thought this this might help someone else with this issue.
I couldn’t recall how I corrected it last time, or if it corrected itself. The ac continued to work. I then read several posts on the internet by fellow owners that had, and maybe solved the issue by various procedures. This error code indicates an open circuit, having to do with the heat pump. Since I do not have a heat pump, the ac continued to work. I tried doing a reset on the thermostat, and the screen began to freak out a bit. Then the ac wouldn’t shut off. I removed the outer cover and turned it off with the inner posts. I left the cover off the rest of the night.
Today, I tried another suggestion. I turned off all electricity, 120 and 12v. The thermostat works off of 12v. After a couple of minutes, I turned everything back on, then I put the thermostat cover back on (I was willing to leave it off if I needed to). I turned on the air conditioner, and everything is working well with no error code.
I suspect that the culprit in this case is the thermostat. I will be looking into replacing it. I have the three button, black, square thermostat.
I thought this this might help someone else with this issue.
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