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 > Suburban water heater wont relight after first start

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SMOKESKULL

Kamloops BC

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Posted: 07/09/18 07:12pm Link  |  Quote  |  Print  |  Notify Moderator

If you turn the switch off and back on it restarts but wont otherwise. Its in a new to us camper so history is unknown. Could it be a faulty thrrmostat? Testing method? Thanks in advance.

Yosemite Sam1

Under the pines.

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Posted: 07/09/18 09:47pm Link  |  Quote  |  Print  |  Notify Moderator

If it's manual, try doing a pilot light first. It's counter-intuitive but my water heater won't bypass the pilot-light stage to go straight on.

enblethen

Moses Lake, WA

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Posted: 07/09/18 10:07pm Link  |  Quote  |  Print  |  Notify Moderator

Post exact model number of the water heater


Bud
USAF Retired
Pace Arrow

2003 Chev Ice Road Tracker


SMOKESKULL

Kamloops BC

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Posted: 07/10/18 12:01pm Link  |  Quote  |  Print  |  Notify Moderator

SW6-D is the model number

enblethen

Moses Lake, WA

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Posted: 07/10/18 02:09pm Link  |  Quote  |  Print  |  Notify Moderator

Appears to be a DSI water heater.Manual

I would start by cleaning the ignitor/flame sensor.
Make sure they are adjusted properly.
Switch should be left in the "on" position.
Make sure the ground connection for the gas valve is clean and tight.
It is possible that the unit is shuting down by the ECO opening rather then the thermostat.
Does the red light adjacent to the switch come on?

theoldwizard1

SE MI

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Posted: 07/10/18 05:05pm Link  |  Quote  |  Print  |  Notify Moderator

I had a similar problem on a Dometic Water Heater. 3 trips to the dealer could not solve the problem. I would say this was about a 90% cure. Remove both thermostatic switches. Clean the face of the switches with a Scotch Bright pad as well as the face of the tank where they touch the tank. It you want to get fancy, apply a bit of thermal heat compound they use CPU cooler (NOT the adhesive type !)

For some reason the gas valve were just not opening up !

SMOKESKULL

Kamloops BC

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Posted: 07/10/18 08:01pm Link  |  Quote  |  Print  |  Notify Moderator

I let the tank cool down and had the wife run some hot water. I stood by the heater and it made no noises. Finally the fault light came on. I had her cycle the switch off and on and it lit up immediately. I guess in a way its a built in gas saver. Its easy enough just to cycle the switch once in a while begoe you need hot water.

enblethen

Moses Lake, WA

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Posted: 07/10/18 08:50pm Link  |  Quote  |  Print  |  Notify Moderator

It could be the ECO or thermostat not closing.
Fairly easy to replace and available at most RV parts store. Not that expensive.
Example of what they look like. Verify your part number.
ECO/thermostat

SMOKESKULL

Kamloops BC

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Posted: 07/11/18 04:05am Link  |  Quote  |  Print  |  Notify Moderator

Ya i am thinking the t-stat might be wonky too. Last year when i used the camper water would drip out of the releif valve but its not doing it this year. I will report back thanks again.

SMOKESKULL

Kamloops BC

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Posted: 07/11/18 05:19pm Link  |  Quote  |  Print  |  Notify Moderator

I took the t-stat out and realize it was installed crooked and not seating properly on the tank. I cleaned the surface and install correctly and it works perfectly now. Imagine its been like that since new. It would have drove me crazy. Camper is a 2004 Lance.

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