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Old 08-04-2019, 10:54 PM   #1
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Dometic A/C Thermostat E1 Error

So went to move my thermostat an made the mistake of not unplugging the 12v power causing wires to touch and a spark now the thermostat keeps blinking an E1 error. I have tried to do the reset method of holding power and + but doesn't seem to do the trick. Does anyone know how to fix this problem? The thermostat is a Dometic 3316250.000 and the AC unit is H541915.
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Old 08-06-2019, 12:16 AM   #2
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Press and hold the '+' button.
Press and hold the 'On/Off Mode' button.
Hold both buttons down for about three seconds until the screen shows a ----.
Release both buttons and press the 'On/Off Mode' button again to turn system off.

Press 'On/Off Mode' to turn back on.





E1 Communication error between t-stat and module box (in ceiling)
Check the 'orange wire' connections
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Old 08-06-2019, 07:18 AM   #3
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Quote:
Originally Posted by Old-Biscuit View Post
Press and hold the '+' button.
Press and hold the 'On/Off Mode' button.
Hold both buttons down for about three seconds until the screen shows a ----.
Release both buttons and press the 'On/Off Mode' button again to turn system off.

Press 'On/Off Mode' to turn back on.





E1 Communication error between t-stat and module box (in ceiling)
Check the 'orange wire' connections
Did those things but still get the error. I read elsewhere might have to replace tstat
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Old 08-12-2019, 03:47 PM   #4
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Replaced thermostat today but still getting the E1 error code. Manufacturer just says to take it in to get serviced but that's not a option I don't know if there's people who will come to you to service it or if this is a simple fix that can be done under the cover on the roof?
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Old 08-16-2019, 04:57 PM   #5
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Originally Posted by Brucebwp2 View Post
Replaced thermostat today but still getting the E1 error code. Manufacturer just says to take it in to get serviced but that's not a option I don't know if there's people who will come to you to service it or if this is a simple fix that can be done under the cover on the roof?
Replaced circuit board and now works fine.
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Old 08-20-2019, 09:30 PM   #6
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Quote:
Originally Posted by Brucebwp2 View Post
Replaced circuit board and now works fine.
What circuit board did you replace? T-stat board? Our units are temperamental in that they will cycle on the fan for 10 secs and shutoff. Then after several cycle they will stay on and cool. All 3 do the same thing. Just now they will not come on at all with 79 degrees OAT and set to 60 on the tstat. We don’t have an on/off button. It’s a slide switch on the bottom of the tstat. How can I reset this one?

Is there a control board on these things? Is that where you replaced the board? If so where would that little jewel be located on a 2010 DS?

I’m hoping you replaced the board on the tstat. BTW, the tstat reads out all modes, temps, and zones correctly. Model is 630516.301

Thanks for any help offered.
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