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Your gratifying reply is much appreciated, only hope that it means your problem is now resolved. Cheers Conundrums.

Normally would always suspect the pump with the banging and early cut out. Would still be suspicious despite you saying seems OK. Alternatively if system prone to blockage, slow to make up and little pressure to clear air, sounds like cold feed between header tank and make up point to system has...

Precisely, what does your fault finding guide suggest. You sound as if you know what you are talking about what is your guestimation of the fault. It is a long time since christmas only trying to help.

Still no change, plan to change pump to see if that resolves anything & if not add Fernox Superconcentrate Boiler Noise stuff which will need time to take effect. Has anyone any other ideas, I will update with progress report.

Replacement thermocouple is first consideration cheap & economical possible solution. If not a success a new pilot with spring required and because of flame retention slot importance in pilot tip, which do congeal with age, and make pilot stability poor and suseptible to minor changes. Because...

Just a bit of input, in the late 60', Honeywell promoted a number of types of heating control systems called plans. Y Plan, W Plan S Plan etc utilising 3 way valves or 2 way valves Honeywell will supply schematics, wiring diagrams, etc if contacted. Suggest you stay with problem, there is...

Pump hasnt been changed as we know of and is on speed 3 where it has always been. System fully pumped. Stopped the pump when noise happening and it makes no difference. obviously pump only stopped for short period. Noise is cyclic vroooooooooooom vroooooooooom slowly increasing from nothing then...

I have a noise problem with a Thorn M54 Floor Mounted Conv Flued Boiler which has an unusual noise senario. It is in excess of 20years old but in exceptional condition externally. The noise is only experienced upon start up for about 15 mins and the same when cooling down, but is enough to...