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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

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

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

not sure i will try

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

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