Fridge Gas Ignition issue. - Motorhome Forums, Motorhome Discussion, Motorhome Chat

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post #1 of 35 (permalink) Old 24-07-2021, 17:13 Thread Starter
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Fridge Gas Ignition issue.

Hi,
I am not new to 3 way fridge on gas problems but this one different for me.
Brief introduction, RM6401L (old!).
Burner assembly changed 2 years ago and chimney swept! All well.
Recently would not light on gas, burner removed and blockage of jet remove with compressed air.
Now lights on gas and stays lit after release of knob.
So far so good.
However the ignition continues without ceasing. Now I believe the thermocouple current holds the gas valve open, which it does, BUT why does the ignition continue? The thermocouple is obviously giving an output to the gas valve.

Does anyone know how the igniter is designed to know that the burner is lit and therefore cease?
Attached is a diagram that I worked on the last time I was wrestling with the fridge. At that time I commented that I could not see how the ignition ceased.
Any advice gratefully received.
Attached Files
File Type: pdf Control Switch.pdf (418.0 KB, 11 views)
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post #2 of 35 (permalink) Old 24-07-2021, 21:58
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Logic would suggest that the thermocouple alerts the gas valve to stay ope
n and to shut the power to the spark off.

I would give the valve a study and see how many wires come out of it and where they go.
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post #3 of 35 (permalink) Old 25-07-2021, 07:45
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I cannot answer your question but:-

I did have this issue in our last Bessie "However the ignition continues without ceasing" I'm not sure of the cause, but after the fridge was lit I took the outside vent cover off and removed the black wire from the ignitor, this stopped it from clicking, and I had to put it back and repeat each time I went from 12v, not a proper fix but it worked while we were away, I never got around to fixing it as I sold the van.
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post #4 of 35 (permalink) Old 25-07-2021, 18:39 Thread Starter
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Thanks for the response,

I'll ease out the fridge and take another look at the gas valve connections. I'll also change the thermocouple for an old one that I have.

The fridge is 19 years old so not a bad innings but the cost of a new one is substantial!
Is it likely that a new model is available to fit exactly the space occupied at present?
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post #5 of 35 (permalink) Old 25-07-2021, 18:40
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Google fridges at O,Brians
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post #6 of 35 (permalink) Old 27-07-2021, 08:19 Thread Starter
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Pudsey Bear. Response from O'Briens "Unfortunately Obriens business has ceased trading.".
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post #7 of 35 (permalink) Old 27-07-2021, 08:23
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That's a shame as they were great for getting replacement fridges, they placed importance on the actual sizes

http://www.obrienscamping.co.uk/Gas-Fridges.htm
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post #8 of 35 (permalink) Old 27-07-2021, 16:32 Thread Starter
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A renewed look at the gas control valve.
There are 4 connections.
1. Gas in
2. Gas out.
3. Thermocouple.
4. 2 terminals, connected to energy type selector switch.


These terminals at present (fridge out, and disconnected) are internally shorted together, I assume because the gas valve is closed.
The selector switch provides an external short to these terminals except when gas is selected.


There is an attachment (thermostat) to the gas valve assembly which I think is connected to the temperature control which has no function when the fridge is on gas.


In other words, I fail to see how the ignited knows when to stop.
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post #9 of 35 (permalink) Old 27-07-2021, 22:09
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I'm sure we have some gas engineers on here so just giving your post a bump.

Jean
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post #10 of 35 (permalink) Old 27-07-2021, 22:16
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Quote:
Originally Posted by Borisd0 View Post
A renewed look at the gas control valve.
There are 4 connections.
1. Gas in
2. Gas out.
3. Thermocouple.
4. 2 terminals, connected to energy type selector switch.


These terminals at present (fridge out, and disconnected) are internally shorted together, I assume because the gas valve is closed.
The selector switch provides an external short to these terminals except when gas is selected.


There is an attachment (thermostat) to the gas valve assembly which I think is connected to the temperature control which has no function when the fridge is on gas.


In other words, I fail to see how the ignited knows when to stop.
I would presume that normally the thermocouple is at room temperature on firing up, once the pilot lights it heats up and disconnects the ignition sequence. I am not a gas engineer but would think it is a thermocouple failure - not generating the required voltage.
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