wocester bosch boiler Help and information on all topics relating to your central heating, air conditioning and ventilation issues.

[trevors50uk]

I have a wocester bosch highflow 400 boiler.
The pilot flame goes out intermittently.
I've changed the thermocouple and the pilot injector but still have problem. I have considered the length of the pilot flame but dont know how to adjust.
Could there be a problem with the length of flame or could there be a problem with the gas valve. help would be most appreciated.

[htg engineer]

Check the pilot flame, it should be a strong blue flame (no orange) and the thermocouple should sit in the midddle of the flame, if the flame just touches the TC, then the pilot may need cleaning.

They also have an overheat stat connected in series with the thermocouple - if it's overheating the pilot will go out.


htg

[trevors50uk]

[quote="trevors50uk"]I have a wocester bosch highflow 400 boiler.
The pilot flame goes out intermittently.
I've changed the thermocouple and the pilot injector but still have problem. I have considered the length of the pilot flame but dont know how to adjust.
Could there be a problem with the length of flame or could there be a problem with the gas valve. help would be most appreciated.[/quote]

Thanks for reply.
Have ordered O/H stat