boiler will not stay on

[sapj100]

glowworm fuelsaver MkII boiler, pilot lght out this morning. Relit everthing seems O.K . 10 mins or so later pilot light goes out again. Looking through pilot light windows flames seem to get weaker and weaker before final shut off. Any Ideas ?

______________________
moderator

moved as posted in wrong forum

 

[kevplumb]

needs a service

corgi job

 

[sapj100]

Engineer visited today, boiler dead. Heat excahnger gone down ?
Not sure what to replace it with.
Another similar gloworm boiler or complete change of system
i.e Combi boiler .
Any advice much appreciated

 

[kevplumb]

replace it with another heat exchanger

 

[ChrisR]

CHeck the hysteresis on the boiler stat hasn't gone wide.
When it's OFF and shouldn't be, check the Switched Live input.
Fans do seize up - but they don't unseize by themselves as far as I know!
APS's can work hot but not cold or vv.

If an engr's there while it's misbehaving I can't see it being hard to diagnose.