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Open Roads Forum  >  Tech Issues

 > Atwood Water Heater Will not Ignite or Stay Lit

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mando_man

Aloha, OR

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Posted: 06/23/22 03:55pm Link  |  Quote  |  Print  |  Notify Moderator

I'm having a problem with my Atwood water heater. It attempts to ignite, but then fails. I've replaced the TSTAT, ECO, thermo fuse (circled in green). You can see and hear the spark when it's attempting to ignite, but never catches (circled in blue). What I do see sometimes is ignites, but I see a small flame for a second or two where it's circled in red which does not seem right. Any thoughts?

Picture of Water Heater

enblethen

Moses Lake, WA

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Posted: 06/23/22 05:14pm Link  |  Quote  |  Print  |  Notify Moderator

Start by checking the ground on the gas valve. It is hidden behind the mounting bracket.
Check continuity on the TWO gas valve coils. They should read the same resistance.
I don't care much for the wires at the circuit board being so tightly twisted.
Forgot ask does your other appliances work OK?

* This post was edited 06/23/22 05:31pm by enblethen *


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dougrainer

Carrolton, Texas

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Posted: 06/23/22 08:09pm Link  |  Quote  |  Print  |  Notify Moderator

1. Small flame indicates a clogged orifice. Remove the orifice and clean with spray carb cleaner and compressed air.
2. Also indicates LOW or marginal LP gas pressure. Light the Stove/Range burners all 3 or 4. They should have a full blue flame
3. When it tries to ignite, tap on the gas valve with a hammer. IF the flame then comes ON, your gas valve is bad.
4. If the W/H is in a slide room, then the rubber gas line may be pinched. Doug

JimK-NY

NY

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Posted: 06/23/22 08:32pm Link  |  Quote  |  Print  |  Notify Moderator

The original post was confusing. Was the ignitor replaced? If not, that should be first on the list.

Next make sure all the connectors are clean and seated especially the connector array, upper right.

mando_man

Aloha, OR

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Posted: 06/23/22 08:45pm Link  |  Quote  |  Print  |  Notify Moderator

Igniter was not replaced, it’s sparking. Connections look good, all removed, cleaned and securely attached. All gas appliances work fine (fridge, heater, stove, oven). Continuity looks good. Have not checked orifice or banged on gas valve. Will try that next. That’s for everyone’s suggestions.

StirCrazy

Kamloops, BC, Canada

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Posted: 06/24/22 06:39am Link  |  Quote  |  Print  |  Notify Moderator

I would check that the ignightor is still properly gapped, althought it sounds like it is sparking, and before your go nuts try spraying compressed aire throught the compustion path and make sure there is nothing causing interferance with the air flow. I had a simular problem and it ended up being bugs.


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JimK-NY

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Posted: 06/24/22 06:51am Link  |  Quote  |  Print  |  Notify Moderator

Again, replacing the ignitor should have been the first step. Maybe something else has failed but ignitor failure is pretty common.

dougrainer

Carrolton, Texas

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Posted: 06/24/22 08:00am Link  |  Quote  |  Print  |  Notify Moderator

JimK-NY wrote:

Again, replacing the ignitor should have been the first step. Maybe something else has failed but ignitor failure is pretty common.


Remember, he stated that AT the exit from the orifice he had a small flame. THAT would NOT indicate an Electrode problem. FYI, the main cause of electrode failure is the white porcelain has microscopic cracks and "bleeds" the spark voltage. Resulting in no or diminished spark. What the OP has found out, is, you cannot just start replacing parts. It gets expensive. Doug

dougrainer

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Posted: 06/24/22 08:03am Link  |  Quote  |  Print  |  Notify Moderator

To the OP, IF that water heater is more than 10 years old, I would REPLACE the gas valve. Atwood gas valves usually fail to "seal" after many years of service. What they do is, if you have the W/H OFF, spray soapy water all over the orifice and wait got 5 minutes, keep the orifice wet with soapy water. Odds are you will get bubbles indicating a leak. When I do a Manometer test on older RV's and it fails, this is the FIRST place I look. Most times it is leaking. This is NOT the cause of your problem, but I would do the test and replace if it fails. Doug

BluegrassBill

Woodland, Wa. USA

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Posted: 06/24/22 09:22am Link  |  Quote  |  Print  |  Notify Moderator

The air/gas tube is plugged-up (the part that is circled). Remove and clean, good to go. Spiders and stink bugs love to nest in the tube.


Bill & Kathy Francis
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