Ultrastore on gas not staying lite ,

[rowtrak098]

Ultrastore on gas not staying lite , I have spark and gas lites for 10 seconds and the led goes red plenty of gas and regulator is working fine

 

[Jcloughie]

Similar problem to this thread, it might point you in the right direction.

Dometic fridge won't run on gas

We have a 2010 Bailey Pegasus 554 with a Dometic RM 8550 fridge (according to the sticker behind the vege tray). After much effort and help from several of you, I solved a problem with a stuck corroded igniter battery, thank you, and I was able to start and use the fridge successfully...

forums.practicalcaravan.com

John

 

[rowtrak098]

No it's the water heater not the fridge.

 

[Jcloughie]

No it's the water heater not the fridge.

But the issue is the same.

John

 

[rowtrak098]

Well it's a 12volt circuit board that has ignition probe and I replaced that , as I said I have flame but it goes out after about 3-5 seconds, board has a fault is my guess

 

[Mel]

Welcome to the forum. Apologies, I only know basic technical stuff so that is all I can suggest.
I don’t know the age of your van or your experience with it. But some older vans had an external flue cover and the heater would not stay lit unless that was removed.
Also we had a faulty regulator but it only became apparent when there was high demand on gas. So a couple of gas rings on the job worked fine but if you added in the oven, or gas heater or fridge then the gas died.
Doubt this helps much but it is all I have got.
Hope you get it sorted
Mel

 

[Buckman]

Well it's a 12volt circuit board that has ignition probe and I replaced that , as I said I have flame but it goes out after about 3-5 seconds, board has a fault is my guess

Have you removed the cover over the gas vent on the outside?

 

[Dustydog]

John and Mel have covered 99% of the issues that may cause your problem.

I assume by “probe” that is the thermocouple you have replaced?


This video follows up on Mel’s suggestion.

 

[ProfJohnL]

John and Mel have covered 99% of the issues that may cause your problem.

I assume by “probe” that is the thermocouple you have replaced?

The Ultra store does not use a thermocouple, it is fully controlled by the printed circuit board, which powers the gas valve and the ignitor, and detects the flame electronically.

The symptoms suggest the circuit board is unable to detect the flame, so it goes to "lock out"

The appliance uses almost a full circular burner. It is arranged so the ignition starts at one side of the break, and it relies on the gas flame to spread so it progresses all the way round the burner to other side of the break, where the flame detection electrode is positioned.

If the flame does not make fully round the burner, the flame will not be detected and the PCB will time out and go to lockout.

There can be several causes for this type of fault.:-

First of all, lack of gas, blocked air intake or exhaust or failed ignitor Which the OP has discounted
PCB failure
Broken wires
Electrodes corroded or bent or moved
Burner bar obstructed or damaged (older models used to suffer from rusting)

Without first hand inspection we cannot realistically indicate what the actual problem is

As with all gas installations and appliances you should not attempt repairs unless you are fully competent to do so in accordance with the regulations and you have the full suite of required equipment to perform the necessary testing.