Cannon Oven taking long time to get hot help please

[electrofix]

well from what I can think its either the board or the probe. tried to find values for the probe to no avail but its likely the upper and lower probes will have similar resistance values at a given temperature so if you like you could disconnect then and measure the resistance of each one
is the cooling fan running ? not sure if it does with the lower oven but normally does to keep board cool

Dave

[happyhero]

Hi Dave, I have now come to the probes. I think the board has gone but this is what I found.

The 2 probes have different connectors and so are not interchangeable without cutting wires. The resistance on both of them is 540ohms. The oven wont run with the probe unplugged and gives an error code on the front display of FO3 which I suppose is what it is supposed to do if a probe becomes open circuit.

I have now started getting fluctuating voltages on the only element that is being supplied (the fan element). It climbed to over 400V which is crazy and I was surprised it didn’t cause a problem (I switched off before it could get any higher).

I doubled checked everything here thinking maybe it’s me doing something silly but all looks as it should as far as my testing. I even tested the live on the element to earth to give my testing a level to test from but still the voltage was giving silly readings. Is this the board messing up on everything do you think?

[electrofix]

cant see any reason for the silly voltages apart from a meter fault. did you test live in to the cooker

but probes seem ok as they match so it looks like a board problem which even I could not fix as it needs to be programmed

Dave

[Author]

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