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Old 11-05-2014, 11:17 AM   #1
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Water Heater power supply issue

Hello: I am new to this site as well as a new motor home owner. I recently purchased a 2003 Jayco GreyHawk that includes a monitor panel. Inside of this panel is a 110 volt switch for the Atwood 6 gallon water heater that runs on gas only. When I activate the switch it lights to indicate it is on but I do not get 12volts at the water heater. I have checked the heater and all of its systems are good. I can connect 12 volts directly to it and if fires right up. Somewhere between the 110 volt switch and the heater it looses its "juice" and fails to supply the 12volts needed to activate the water heater. Fuses and breaker are all ok. I am having trouble identifying what wires feed the 12 volts to the heater. Any suggestions? Will this require removal of the heater to access the back side to check connections or is there somewhere else to check first?
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Old 11-05-2014, 11:34 AM   #2
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Quote:
Originally Posted by CasinoAl View Post
Hello: I am new to this site as well as a new motor home owner. I recently purchased a 2003 Jayco GreyHawk that includes a monitor panel. Inside of this panel is a 110 volt switch for the Atwood 6 gallon water heater that runs on gas only. When I activate the switch it lights to indicate it is on but I do not get 12volts at the water heater. I have checked the heater and all of its systems are good. I can connect 12 volts directly to it and if fires right up. Somewhere between the 110 volt switch and the heater it looses its "juice" and fails to supply the 12volts needed to activate the water heater. Fuses and breaker are all ok. I am having trouble identifying what wires feed the 12 volts to the heater. Any suggestions? Will this require removal of the heater to access the back side to check connections or is there somewhere else to check first?
CasinoAl
I'm confused
If your Atwood 6 gallon water heater "runs on GAS ONLY", (as you said), your RV SHOULD NOT have a "110 volt switch" for the Atwood 6 gallon water heater.
Mel
'96 Safari
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Old 11-05-2014, 12:25 PM   #3
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Lets back up a step. I have two switches on mine. 1 is for the 110 VAC heater and one is for the 12 VDC controller. My tank has both.

Given that you only have 1 switch I would check the voltage accross the open switch. AC or DC? If it is AC it's for a heater you do not have or do not know you have. If it's DC you have a wiring or fuse problem if you can supply 12 VDC to the controller and everything works. I'd sort that out first. You may have had a tank replaced or somebody might have added something like a hotrodd heater in the past.

As to access I have a screwed in panel in our Fourwinds that hides the back of the tank. 2 screws, 2 miinutes to get it out of the way. You probably need to find that as the bypass valves are probably also back there. Good luck with your looking.
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Old 11-06-2014, 07:55 AM   #4
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Thanks for your replies. Mel it confuses the devil out of me too but the water heater switch is 110 volt somewhere within it has to step down or convert to 12 volt. I have to dig deeper into the wiring but access to the back side of the water heater is restricted at best. I guess the next step is to disassemble the 110 volt switch and see if I can begin tracing that wiring path. Wondering if anybody else has experienced this issue and how they solved it.
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Old 11-07-2014, 07:42 AM   #5
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I cannot see why anyone would add the cost of a separate power supply for the water heater control board when they have 12 VDC sitting there to tap into. I will be very surprised if you find one.
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Old 11-07-2014, 07:54 AM   #6
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Maybe it had one of them Hot Rods in it, at one time and the switch is for that.
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Old 11-08-2014, 02:36 PM   #7
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I hate to admit but after closer inspection and search I found a small 12 volt switch tucked out of the way. All Works fine now. Thanks to all for your replies
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