Thank you very much Boilerman2, I am a happy man.
After your post I removed the filter and the boiler ran ok. After my holiday I fitted a new filter and cleaned the gauze filter in the constant level unit and it has now been running successfully for a week.
(When the boiler stopped initially...
Thanks for the advice Boilerman2.
I did manage to track down a C551A in the USA which I fitted but the boiler still cuts out between 30 to 60 seconds after the ignition spark shuts off. I have checked the C551A by putting the probe on the cooker hob and checked that the circuit changes from...
Can you tell me where you got your Honeywell Flame sensing Unit, mine has just stopped. The code is C551A. I have the 110,000 BTU/hr Hotspur. It says it is made by Harford-Unical of Cockfosters and was installed in the mid 70's.
Thank you