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Old 02-16-2021, 12:48 PM   #1
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Suburban SW10DE circuit failure

Suburban water heater circuit failure
Posted Today at 11:34 AM by monaco2000
Some one PLEASE help !! my SW10DE water heater lights but shuts off immediately . RV dealer sold me a new gas valve , control board and thermostat !! Still doesn't work !!!!!
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Old 02-16-2021, 12:59 PM   #2
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Quote:
Originally Posted by monaco2000 View Post
Suburban water heater circuit failure
Posted Today at 11:34 AM by monaco2000
Some one PLEASE help !! my SW10DE water heater lights but shuts off immediately . RV dealer sold me a new gas valve , control board and thermostat !! Still doesn't work !!!!!
Make him take all that crap back. Get someone with a voltmeter and some electric knowledge to troubleshoot the problem and find out what is wrong. As you have found out, Electric ain't easy.
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Old 02-16-2021, 01:24 PM   #3
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Troubleshooting procedures for Suburban water heaters

http://www.airconditionercontractors...ban%20V1.3.pdf
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Old 02-16-2021, 01:36 PM   #4
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Suburban water heater circuit failure

I have read the troubleshooting manuals 50 times !! Flip the switch , new board , light comes on , no reaction !! Old board , ignites but goes out immediately !! 120v works fine , LP , not working !!!
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Old 02-16-2021, 01:43 PM   #5
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Lights off then goes out...that is Flame Proving Signal Failure

Not the Gas Valve
Not the Thermostats (come as a set)
Could be circuit board but new one didn't fix it so NO

Spark Electrode has DUAL purpose
It supplies the High Voltage for ignition of the propane
*Gas valve and electrode get DC at same time

When Flame lights the spark electrode is used as return path for the milliamp signal generated by flame rectification.
This milliamp signal is sensed by the circuit board---no flame signal return then DC gets dropped off gas valve so raw fuel doesn't accumulate

Return the gas valve
Return the set of thermostats
Return the circuit board

Buy new spark electrode

Throwing parts at a problem will eventually fix the problem
BUT at what costs
Simple troubleshooting is cheaper and easy to do
****I would be very hesitant to have NAY work preformed by that RV Dealer!!!!

Suburban Spark Electrode
https://pdxrvwholesale.com/products/...e-232258%20%20


Could just be dirty electrode...soot/carbon build up----clean electrode using emery cloth
Could just be loose/dirty wire connection...unplug from electrode/clean both ends/then tighten/reinstall
Could be cracked ceramic insulator...replace spark electrode
Could be wire is loose inside the ceramic insulator...replace
could be spark gap...adjust 1/8" - 3/16"

Easiest is to replace it

But not gas valve (or there would be NO flame)
But not thermostat (or there wouldn't have been a flame---thermostat controls firing but when bad they don't allow ANY firing or don't Stop the firing)
But not circuit board (sometimes the vlave circuit fails but then you would not have flame)

Flame lighting off thengoing out----FLAME PROVING---Spark ELectrode Circuit
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Old 02-16-2021, 01:50 PM   #6
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Suburban water heater circuit failure

I have read the troubleshooting manuals 50 times !! Flip the switch , new board , light comes on , no reaction !! Old board , ignites but goes out immediately !! 120v works fine , LP , not working !!!
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Old 02-16-2021, 01:53 PM   #7
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Get a voltmeter
Learn have to use it
Trace the DC circuit and find where it isn't---fix that problem



DC comes from a FUSED source
Junction box for DC is on rright side of WH Tank (looking from the backside)
T-stats are under the Push To Reset Cover above gas valve
**Left side---black wires---120VAC for element
**Right side---red wires---12vDC for propane

Circuit board on backside of WH Tank

Gas Valve in outside compartment....red wires DC+/black wires ground

Spark Electrode....inside the combustion chamber...Large Orange wire (comes from transformer on circuit board)

That should be enough info for you to find/fix the gas circuit
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