ravenheat

[terry1000]

hi all
have a ravenheat RSF 820/20T boiler if the c/h is on no probs workes for ever
but turn off c/h and after a while pilot goes out re light and stays on for a while goes out again have changed thermo couple
please any ideas best regards terry

 

[superdupergasman]

Does the fan run at slow speed when there is nothing on??

 

[Slugbabydotcom]

I've read your post a few times and what I'm about to suggest as a possible cause is a bit like betting on a nags head at Ascot as there are a few possibilities; and something you haven't mentioned could make a difference, but here goes anyway.
I reckon that a microswitch on your diverter valve head could be stuck in the ON position.

 

[terry1000]

hi fan not running when pilot is out but comes on when water or heat is called for thanks for help its driving me mad

 

[SortedPlumbing]

I thought fan runs at slow speed with pilot on?

 

[ollski]

I thought fan runs at slow speed with pilot on?

Perhaps thats why she's overheating scotty!

 

[terry1000]

not sure i will try

 

[terry1000]

hi not running when piolot on only when call for heat or hot water

 

[gas4you]

If you are comfortable working with 240VAC electrics check for 230-240 VAC at terminals 36 & 37 at the fan.

If not get an RGI in.

EDIT; As this involves removing the combustion chamber cover you should get an RGI in anyway.

 

[terry1000]

hi no probs qual electrician it could be 270 ohm resistor oc does this run fan at slow speed ?

 

[gas4you]

yes it is supposed to run at slow speed.

 

[terry1000]

hi sorry for delay in posting been away
thanks for all help and pointing me in right direction
fault was oc micro switch oc between pin 38 and pin 36
thanks again best regards Terry