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Problem with CH only on Ferroli Combi 77 FF boiler?

Hi I have a ferroli combi 77 FF boiler which works fine on DHW and is OK the first time it comes on with CH. However after that I can here it trying to fire up again and after a while it may re-light only to repeat the cycle. I have seen flashes from RL2 which cotrols the fan but if there is a problem with the fan why does the DHW work fine. I would appreciate any help with this problem. The PCB is a VMF6.

Amberst
October 2009

Ferroli Heating, Home Heating Systems Problem Ch 77

Thanks Ian. I felt the PCB was the problem but did not want to get one til I was sure.

Amberst
October 2009

new pcb required. c/h delay timer is knackered.

Ian
October 2009

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Problem with CH only on Ferroli Combi 77 FF boiler?

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