perfoma 30he hot water onl when heating on

[opps]

Hi all

Heating left on all night. She who must be obeyed turned off the heating this morning and then went for a shower- not hot water...

The Fan/Flue light was flashing so I reset the boiler. LED still flashing. I noticed a tiny amount of water leaking from DHW pipe where it enters the boiler, or rather the water seems to be running down the pipe form inside the unit.

I turned the boiler off, turned up the room stat and restarted the boiler. Heating working fine. then I opened a hot water tap and hot water came out.

In spite of the diagnostic lights, the fan/flue seem unlikely given that it works fine when the heating is on.

Boiler approx. 3 years old.

It is safe to assume that the flow diaphragm has kicked the bucket?

 

[gas112]

Diaphragm does not affect the fan/flue .
just luck heating has come on without fan/flue fault showing again.
The part that is faulty is intermitent at first before going completely .
part req is approx 30 quid but need doing by qualified guy and only takes 20 mins to do he could also look at your water leak.

 

[opps]

Thanks for the reply gas112

I will phone the fellow that fitted it. Which part needs replacing then? At £30 I guess that it is not the fan or venture but some kinda sensor.

Is the fault a "common" one?


______________edit/update_____________

Just wanted to confirm that your suggestion that it is the airpressure switch seems to be correct. I have just turned down the room stat, waited a few minutes and then called for hot water and it fired up ok.

I had also noticed that the leak has evaporated and is no where near the diaphragm.

Once again thanks for your help