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Old 09-04-2022, 12:42 PM   #1
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Join Date: Jan 2018
Location: SARASOTA, FL
Posts: 276
Atwood water heater no power

Hello All -

Doing some maintenance and tried to turn on my water heater and it appears that there is no power going to the unit. I've owned this coach for 3 years and have never used the water heater as I live in Fl and haven't had the need for it but will in the next few months. I base the no power on the following:

Control Panel does not light up (pilot light) when turned on (pic 1)
Fusible link checked and appeared to be in tack (not blown)
All appliance fuses and breakers inside coach are in working order (not blown or tripped).

I don't want to start throwing parts at this "old" heater so I'm looking for help.

Water heater is ATWOOD Model G6A-8E (pic 2 & 3).
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Old 09-04-2022, 01:57 PM   #2
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Did you start the water heater with the drain plug out ?
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Old 09-04-2022, 01:58 PM   #3
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For the LP system do the easy free things first. The 12V connections get a film of corrosion on them. Unplug each connection, clean with pencil eraser, then reattach a few times. The plug on the control box also corrodes and must be cleaned.
Propane pressure in the system is only !0.4psi, so it takes a long time for the system piping to equalize. Start the LP cooktop for a few minutes to insure the system is pressurized. Does the refrigerator run on LP?

Even then it might require 3-5 lighting attempts.
2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA." My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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Old 09-04-2022, 09:08 PM   #4
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Atwood G6A-8E is Gas Only model

Uses 12VDC for controls
So need to verify you have 12VDC to On/Off Switch
*fed from fused source

Got 12VDC to switch
Check that you are getting 12VDC to circuit board in outside compartment
*2A Fuse next to connector good

Clean up that outside compartment.........lots of dirt/dust
Clean wire connections

12VDC goes from fused source to Switch
From switch to to/thru Thermofuse to/thru T-stat to circuit board
*Brown wires
From circuit board to/thru ECO to gas valve solenoid to ground
*Red wires

Pilot Out
Fault Light ----comes on when gas fails to ignite and prove it lit
*Blue wire from circuit board to Pilot Out

Simple DC circuit
Use Voltmeter and follow the circuit

T-stat closes at/below 110*F for Heat Cycle (t-stat closed--DC thru t-stat back to circuit board)
T-stat opens at 140*F.......DC to/thru Thermofuse but not thru T-stat

ECO Opens at 180*F....closes at 150*F
IF it trips/t-stat failed.....Water Heater controls lock out---reset by turning switch off then back on
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atwood, heat, heater, no power, power, water, water heater

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