GLOWORK ULTIMATE 60FF lighting issue

[Mrplumb]

Hi everyone and thnak you in advance for any help

I have the above boiler for the last 2 weeks this is what is happening:

Boilder function [appears to] be 100% normal when cold then when it gets really warm following issue happens:

main burner shuts off
pilot light relights immediately
main burner shuts off again [almost] immediately [1/2 seconds max]
and repeat constantly

but heating still works

pcb was replaced about 6 mnths ago, but you can hear it clicking, or something clicking, maybe a relay?



thanks

 

[Mrplumb]

Also

forgot to add any decent plumbers that will do a fair job in Norwich?

thanks