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Old 12-05-2018, 08:35 AM   #1
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Hot Water from new Dometic very very HOT!

Replaced my Atwood GC10A-3E Water Heater with the Dometic (they bought Atwood) GC10A-4E. Started up with LP gas. Problem is the water seems to be very very hot, at least 150+ degrees F. as measured with dial thermo. Shut the unit down.

This does not seem normal? Should be 140 degrees F maximum. I can't find any spec information as to what temperature the gas and/or electric is shut down via the thermostatic controls.

Bad contact with tank or temp sensor wrong (180 degree ECO and 140 degree installed reversed)?

Does Dometic offer an adjustable thermostat?
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Old 12-05-2018, 08:50 AM   #2
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Go to bryantrv.com an download the service manual for your model, it should have all that information.
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Old 12-05-2018, 02:33 PM   #3
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Atwood GC10-4E uses a T-stat that OPENS at 140*F and an ECO (Energy Cut Off---Hi Temp) that OPENS at 180*F (Will trigger RED Fault Light if it trips)


Just the one set of t-stats...controls heating for both electric & propane


T-stat & ECO have different size terminals/spade connectors
T-stat are smaller ---Brown wire
ECO......Red wire


IF water is HOTTER then 140*F that suggests the T-stat is NOT being held TIGHT against tank wall so temp goes higher before t-stat senses it and Opens




The Atwood 'XT' models that have mixing valves use a 155*F t-stat and 180*F ECO
BUT the XT T-stat uses a PIN connector vs spade






Atwood does offer an optional adjustable t-stat
110*F to 150*F
Atwood 93105








Yes I know Dometic acquired Atwood last year
Still an Atwood
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Old 12-05-2018, 03:03 PM   #4
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I just got a chance to search for an Atwood adjustable thermostat. I don't know if this one fits your model. Sorry I didn't have a chance last evening.
Like old-biscut said, make sure your 'stats are held tight against the tank and have adequate insulation covering them.
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Old 12-06-2018, 09:27 AM   #5
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Quote:
Originally Posted by Old-Biscuit View Post
Atwood GC10-4E uses a T-stat that OPENS at 140*F and an ECO (Energy Cut Off---Hi Temp) that OPENS at 180*F (Will trigger RED Fault Light if it trips)

Just the one set of t-stats...controls heating for both electric & propane

T-stat & ECO have different size terminals/spade connectors
T-stat are smaller ---Brown wire
ECO......Red wire

IF water is HOTTER then 140*F that suggests the T-stat is NOT being held TIGHT against tank wall so temp goes higher before t-stat senses it and Opens

The Atwood 'XT' models that have mixing valves use a 155*F t-stat and 180*F ECO
BUT the XT T-stat uses a PIN connector vs spade

Atwood does offer an optional adjustable t-stat
110*F to 150*F
Atwood 93105

Yes I know Dometic acquired Atwood last year
Still an Atwood
WOW
What a great info. response! Doesn't get better than this.
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