Dometic fridge RM7361 gas not working (1 Viewer)

[GeoffnDee]

If you have not already ,it would be worth checking the continuity of the wires in particular the ground/earth ones , the other thing, I suppose, that could be faulty is the ionisation probe but I do not know if this was the case what the effect would be.

 

[Chevy]

Thanks but it’s not even clicking

 

[Chevy]

Hi Geoff checked all wiring and earths with meter

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[Andycap]

Did you manage to get your fridge sorted

 

[Chevy]

No still not working I’m trying to find out why the new ignition unit isn’t clicking when I apply the 1.5volts to it on the correct pins.
Must be a simple way to test it but no one seems to know and Ive exhausted all the help on the web?

 

[GeoffnDee]

The ionisation probe seems to control when it should spark as it sits in the flame and seems to stop the sparking when it is burning and allow it when there is no flame , are you able to find a way to test it or maybe it needs to be in the circuit to allow sparking.

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[Chevy]

There maybe two types of electrodes present in your gas boiler: ignition electrodes and flame-sensing electrodes (sometimes also known as an ionisation probe). The ignition electrode, as you can probably guess from its name, is responsible for creating a spark that will ignite the gas supplied by your boiler. The ionisation probe acts as a safety device. It is able to sense when there is a flame present in the burner. If it cannot sense a flame, it will turn the gas off to prevent the boiler from supplying gas that isn’t being burnt.
The problem is I’m not getting a spark nor the gas to create a flame so I believe the ionisation probe isn’t in the equation at the moment .
I will try and force the situation by operating the gas valve with 2.5v battery and using a lighter to get a flame at the gas burner and see if the ionisation probe will allow the gas to be maintained

 

[Andycap]

I Know this might sound daft but have you checked out the the three way switch to turn it from 12v to gas. Is ignition unit getting supply.

 

[Chevy]

Hi yes I did change the mes pcb out, it does supply the voltage to the ignition unit

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[mitzimad]

why are you adding battery power to your system? you need to ascertain where the existing 12v supply is failing

 

[Chevy]

I have 12v at the fridge mes pcb, the 1.5v is applied by the pcb when switched to gas to drive the ignition unit

 

[Chevy]

Just thought I would let you know I have fixed the fridge, it turned out to be a combination of both pcb board and the wiring harness.

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[Andycap]

Well done how did you manage to identify the faults

 

[Chevy]

I removed the terminal plug from the igniter and at close inspection noticed 2 of the pins were broken so I made up a new connecter and tested continuity with a meter, as it still didn’t ignite I changed the fridge pcb as I didn’t believe the sense wire was working for the thermostat to the igniter and hey presto

 

[Andycap]

Good to know for future reference. Glad you got it fixed.

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