Worcester 24i fan

[nowtaboutnowt]

Hi
Could someone please tell me how to correct a problem with the fan on my Worcester 24i combi.
The fan comes on when the boiler is activated (normal) and after a certain period would switch off again (normal) Now though, it will not switch off, I have to switch the power supply off the kill the the fan.
Any ideas you good people?

Cheers

 

[Agile]

Sounds as if there is an over run circuit controlled by a stat which may have failed.

Alternatively it may be a timed over run controlled by the PCB and the PCB has failed.

Obviously if I was fixing it I would be seeing what controls it but for free advice its only generality.

Tony

 

[nowtaboutnowt]

Thanks for the response.....
Is there anything obvious that would tell me what is wrong, what would a stat look like for instance and is there anyway of testing it, or would it be a case of replace it and see.

Cheers

 

[Agile]

The first thing to do is identify from the MI what the mechanism involved is.

they can be tested but that needs a heat source and testmeter, usually outside the capabilities of a DIYer.

Tony

 

[nowtaboutnowt]

Tell me where to get the heat source and where to test and I will. I am competent and capable you know.............!

 

[namsag]

On other worcesters fan stays on for 15 seconds after demand has gone.. which would suggest built in timer on the board as opposed to seperate stat.

 

[nowtaboutnowt]

Hi
Are we talking microchips for timers, stats etc or are they easily identifiable. This problem occurred previously but corrected itself after about 4 months, would this suggest a loose connection. When I say fan I mean the bit that extracts all the fumes out of the flue.

Cheers

 

[ChrisR]

The information is not published. There is no separate device which controls the fan alone.
We're talking component failure, maybe on the board. Like a leaky electrolytic capacitor, or a sticking relay, or...
But nobody's going to suggest you try to mend the board.

 

[nowtaboutnowt]

Thanks Chris
Replace the whole circuit board makes sense, I'll try the worcester website for the part.

Cheers