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Old 03-20-2023, 12:39 PM   #1
Join Date: Dec 2018
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hot water heater

I have a gc6aa-10e Atwood heater, works on both gas and electric, however when we try to use the electric heat it doesnt shut off at temp and blows the PRV.
It works fine on propane. Is this a control board problem? Or what might be the solution.

Tks Bob
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Old 03-20-2023, 12:56 PM   #2
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Please make sure you're comfortable working on and near electricity before you do anything you're not familiar with.

Sounds like the 120 VAC control relay to the element is stuck closed or the controller is not turning off after sensing the correct temperature (the thermostat and over temp sensor work for both the gas and 120 VAC side of the unit or so it appears - so, if the gas is working okay, those sensors are probably good).

I'd start with the relay, disconnect it and verify the contact are open when it's not powered using an ohm meter. If they open when de-energized it's likely the control board.

You could also try pulling the brown wire off of the controller (either one) and see if the relay turns off (thus turning off the heating element).
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Old 03-20-2023, 01:08 PM   #3
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I would look at the electric circuit thermostat.

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Old 03-20-2023, 01:09 PM   #4
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Atwood GC6AA-10E
Combo Gas/Electric that uses Common 12VDC for controls, Common Set of T-stat/ECO, common Thermal Fuse and a circuit board

Circuit Board has separate circuits for gas & electric
Both Gas & Electric should heat to 140*F (same t-stat)
IF temp gets too hot on either heat source the ECO (Energy Cut Off) trips at 180*F. Locks out the Water Heater and triggers RED Fault light

T&P Relief Valve can 'weep' when heating occurs ....water swells when heated/pressure increases
AN Air Pocket in top of tank helps control the pressure increase

If issue was T-stat.......would affect both gas & Electric

If circuit board electric circuit was an issue......should OVERHEAT/ECO trip/T&P Blow
*DC Relay triggers AC to element (Yellow wire sends DC to that Relay and if Relay fails AC can go to element w/o any controls)


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You stated :

we try to use the electric heat it doesnt shut off at temp and blows the PRV.

The DC Relay is stuck closed.....AC to element will be continuous'
T&P Blowing is the only safety device preventing water heater from over pressurizing

Located on backside of WH Tank under the protective cover ...same place element is

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Old 03-21-2023, 05:56 AM   #5
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Here's a document which may help
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File Type: pdf Water Heater Service Manual - Atwood.pdf (981.0 KB, 10 views)
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heat, heater, hot water, water, water heater

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