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01-18-2022, 03:25 PM
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#1
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Junior Member
Join Date: Jan 2022
Posts: 7
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Atwood Water Heater Fuse Keeps Blowing
Good evening, everyone! I've got a water heater issue on our 2019 Atwood GC6AA-10E. Had hot water all day, this evening we have no hot water. Found the 2 amp fuse on the circuit board mounted on the water heater blown. Replaced 2 amp fuse, turned the hot water electric switch on and immediately blew the 2 amp fuse within 2 seconds. Replaced 2 amp fuse again, turned the hot water propane switch on and immediately blew the 2 amp fuse again within 2 seconds. Cleaned the thermocouple/resister terminals and checked continuity; we have continuity. Replaced the thermal cutoff, have continuity between the circuit board and the brown wire, checked behind the wall panel inside and verified the connections are good behind the electric and propane on/off switches. Checked wire splice connections in water heater compartment and are all good. Im running out of things to check besides the water heater circuit board. Thoughts?
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01-18-2022, 03:45 PM
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#2
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Senior Member
Damon Owners Club
Join Date: Apr 2020
Location: Clovis NM
Posts: 4,389
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http://waterheatertimer.org/pdf/Atwo...ice-manual.pdf
page 23 tells how to OHM test the circuit board. Sorry, I'm not more help than that.
__________________
2006 Damon Daybreak 3276 35'with 5 Star Tuner. 3 200 Amp Lithium batteries and 2000 watt PSW inverter/charger. 2013 Elantra on a Master Tow dolly.
Retired USAF
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01-18-2022, 03:48 PM
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#3
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Registered User
KZ RV Club
Join Date: Sep 2015
Location: Elephant Butte, NM
Posts: 1,197
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have you checked the heating element it self? Here's a good trouble shooting video;
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01-18-2022, 04:31 PM
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#4
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Junior Member
Join Date: Jan 2022
Posts: 7
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Quote:
Originally Posted by HarryStone
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I'll try that. Been calling local RV dealers to see of they can test the circuit board and say it'll be a $100 diagnostic fee. I can get a new circuit board for that price or cheaper.
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01-18-2022, 05:20 PM
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#5
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Junior Member
Join Date: Jan 2022
Posts: 7
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I have not. I didn't know how to. I'll try that tomorrow when it's light out. Thanks
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01-18-2022, 05:30 PM
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#6
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Senior Member
Join Date: Nov 2015
Posts: 26,837
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2A Circuit Board fuse blowing whether on Electric or on GAS means circuit has shorted
Continuity on 'Power Track' (Brown wire contact and Green wire contact)
Continuity on 'Valve Track' (Red wire contact and Green wire contact)
*Circuit board has to be disconnected/removed to test
'Valve Track'......is not just for GAS
When on Gas 12VDC goes from circuit board to ECO then to Gas Valve
When on Electric Millivolt DC goes from circuit board to ECO then to Gas Valve---just enough current to place ECO in control loop (Hi Temp T-stat) but not enough to energize the gas valve solenoids
If Red Wire circuit is shorted. 2A fuse blows
If Brown Wire Circuit is shorted. 2A fuse blows
****Element shorted would trip the 15A Circuit Board...120VAC not blow the 2A DC fuse
__________________
I took my Medication today. HAVE YOU?
Dodge 3500 w/Tractor Motor
US NAVY---USS Decatur DDG-31
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01-19-2022, 02:38 PM
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#7
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Junior Member
Join Date: Jan 2022
Posts: 7
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I tested the power track (green to brown) and got no continuity.
I tested lamp track (green to blue) and got no continuity.
I tested the valve track (green to red) and got continuity or at least read some resistance.
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01-19-2022, 03:33 PM
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#8
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Junior Member
Join Date: Jan 2022
Posts: 7
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Quote:
Originally Posted by Old-Biscuit
2A Circuit Board fuse blowing whether on Electric or on GAS means circuit has shorted
Continuity on 'Power Track' (Brown wire contact and Green wire contact)
Continuity on 'Valve Track' (Red wire contact and Green wire contact)
*Circuit board has to be disconnected/removed to test
'Valve Track'......is not just for GAS
When on Gas 12VDC goes from circuit board to ECO then to Gas Valve
When on Electric Millivolt DC goes from circuit board to ECO then to Gas Valve---just enough current to place ECO in control loop (Hi Temp T-stat) but not enough to energize the gas valve solenoids
If Red Wire circuit is shorted. 2A fuse blows
If Brown Wire Circuit is shorted. 2A fuse blows
****Element shorted would trip the 15A Circuit Board...120VAC not blow the 2A DC fuse
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Also checked the Brown circuit and the Red circuit. Had continuity on both.
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01-19-2022, 05:37 PM
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#9
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Senior Member
Join Date: Jul 2021
Location: Northern Nevada
Posts: 460
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Quote:
Originally Posted by Mjfirth161
Also checked the Brown circuit and the Red circuit. Had continuity on both.
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Old Bisquit boiled down: 2A fuze blows, short on board 99% chance= Bad Board.
RealNiceTent: Fuze blown Replace Board be done.
__________________
Dave & Kandi & Indica the Chorkie pup "Big Blue"
2001 Holiday Rambler Admiral 30D w/ 2nd slide
2000 P32 7.4 4L80E wide track J71 18/21K
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01-19-2022, 09:32 PM
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#10
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Senior Member
Join Date: Nov 2015
Posts: 26,837
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Quote:
Originally Posted by Mjfirth161
I tested the power track (green to brown) and got no continuity.
I tested lamp track (green to blue) and got no continuity.
I tested the valve track (green to red) and got continuity or at least read some resistance.
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Power track.....no continuity.......board has shorted
Replace with a Dinosaur Electronics Board...better quality circuit board and same/cheaper than OEM Board
https://www.dinosaurelectronics.com/UIB-64.html
__________________
I took my Medication today. HAVE YOU?
Dodge 3500 w/Tractor Motor
US NAVY---USS Decatur DDG-31
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01-19-2022, 11:24 PM
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#11
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Senior Member
Join Date: Jun 2018
Location: Los Angeles area
Posts: 1,416
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^^^ I second Dinosaur Electronics. ^^^
They have re-engineered a number of RV circuit
boards and done a wonderful job of it.
Dometic, Norcold, Atwood, Suburban, Servel, Onan...
Made in the USA, and a 3 year warranty.
My Norcold had one in it and it worked fine... impressed
with the printed circuit board quality. unfortunately
one of the cooling unit pipes rusted through. Had to
trash the fridge and chose to get a residential fridge.
Mike
__________________
Semi-retired technogeek...electronics / computer / 2-way / ham radio... WA6ILQ (45+years)
1985 Fleetwood 32' Southwind (Chev P30/454/TH400), dubbed "Lazarus" by friends... I resurrected it from the dead...
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01-20-2022, 07:57 PM
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#12
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Registered User
KZ RV Club
Join Date: Sep 2015
Location: Elephant Butte, NM
Posts: 1,197
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Quote:
Originally Posted by Old-Biscuit
2A Circuit Board fuse blowing whether on Electric or on GAS means circuit has shorted
Continuity on 'Power Track' (Brown wire contact and Green wire contact)
Continuity on 'Valve Track' (Red wire contact and Green wire contact)
*Circuit board has to be disconnected/removed to test
'Valve Track'......is not just for GAS
When on Gas 12VDC goes from circuit board to ECO then to Gas Valve
When on Electric Millivolt DC goes from circuit board to ECO then to Gas Valve---just enough current to place ECO in control loop (Hi Temp T-stat) but not enough to energize the gas valve solenoids
If Red Wire circuit is shorted. 2A fuse blows
If Brown Wire Circuit is shorted. 2A fuse blows
****Element shorted would trip the 15A Circuit Board...120VAC not blow the 2A DC fuse
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Resident expert here, not the first he's helped.
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01-21-2022, 04:05 PM
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#13
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Junior Member
Join Date: Jan 2022
Posts: 7
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Thanks for all the help and experience here. I've ordered a new dinosaur circuit board, should be here on Monday. I'll update once installed and fired up. Thanks again.
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01-27-2022, 07:51 AM
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#14
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Junior Member
Join Date: Jan 2022
Posts: 7
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Installed the new circuit board and it fired right up. I've got hot water using electric and propane again. Thanks for the help everyone!
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