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Old 07-27-2021, 07:05 AM   #1
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Atwood water heater problem

I am having a problem with an Atwood GC-10A-4E propane/electric water heater. It is in a 2004 Holiday Rambler, Ambassador motor home. It had a bad circuit board and T-stat, I replaced both of them. The propane now works fine but the electric still does not. The heater element is operated through a 12 volt relay and the relay is fine. I get 12 volts at and out of the rocker switch but I do not get 12 volts to the circuit board (white wire). The rocker switch has two small white wires, one larger black wire and a ground.
I am sure the problem is between the rocker switch and the white wire going to the circuit board.
Any suggestions would be appreciated. Thank You
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Old 07-27-2021, 07:20 AM   #2
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Welcome to the Forum:

Download these files. Look at the EMS panel file to see if it is the same as yours.
There are numerous files on the Atwood that should provide help.



https://1drv.ms/u/s!Aqrv2TUdbV6xjzZU...we_GR?e=uKA3AE
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Old 07-27-2021, 07:56 AM   #3
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A couple of pictures would help but there are a couple of experts that will know your setup without looking at them.

My water heater is controlled through a panel that has two switches. One for propane and one for 110 volts.

The files are more specific to my setup but covers quite a few others.

The switches on the EMS panel can be a bit confusing at first. And finding a ground for a voltmeter can lead to false readings. A 12 volt test light is your friend because it puts a bit of a load on the line and you are less likely to be fooled by a reading that goes away under load.

To get a ground for your meter or test light, grab an extension cord and plug it in. Cover the two vertical holes with tape for safety. Then use an alligator clip or whatever you have to make a connection to your voltmeter via the round ground hole in the cord.

Tape this mess up so you don't have intermittent connections. I built a ground cord with a new plug and just connected the ground wire and added an alligator clip to the end of a long wire. It has worked very well for me.
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Old 07-27-2021, 09:14 AM   #4
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Here is the wiring diagram for your heater.


Your description of the rocker switch seems to indicate you may have two separate locations for turning on the electric element as the wiring diagram doesn't match your description. Regardless, you do need 12v power to the board through the white wire, and from there, the yellow wire on the relay should power up and activate the relay.


Be sure the white wire that connects to the board has continuity to the white wire you find at your switch. The diagram is simplified, but the path of 12v will be the same.

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Old 07-27-2021, 09:34 AM   #5
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Quote:
Originally Posted by shade23 View Post
I am having a problem with an Atwood GC-10A-4E propane/electric water heater. It is in a 2004 Holiday Rambler, Ambassador motor home. It had a bad circuit board and T-stat, I replaced both of them. The propane now works fine but the electric still does not. The heater element is operated through a 12 volt relay and the relay is fine. I get 12 volts at and out of the rocker switch but I do not get 12 volts to the circuit board (white wire). The rocker switch has two small white wires, one larger black wire and a ground.
I am sure the problem is between the rocker switch and the white wire going to the circuit board.
Any suggestions would be appreciated. Thank You
The Gas & Electric use 12VDC to function
Typically they use common DC from a Fused Source which is jumpered between the hot side of the on/off switches

You stated you have 12VDC AT the switch and FROM the switch...
DC From switch connects to the OEM White that goes to circuit board for the Electric Operation

The connection to that OEM White wire is typically done at backside of WH Tank using 'Wire Nuts'

Access rear of water heater tank and check the wiring connections
WHITE----Electric
Orange----GAS
BLUE-----FAULT Light
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