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[Kevin Wood]

Yeah, if they start adding Hydrogen I'll be getting a heat pump.

[Sir Tigger KC]

Hydrogen is a flash in the pan. 

[Marks DTM Calib]

Classic repair man hitting it with a parts bomb!

I would be looking to the PCB, there is break all to the gas valves on these other than a coil of wire, this will either work or not work so if its turning on at all then its ok.

As per Kevin, the behaviour is classic knackered electrolytic capacitor behaviour, so either crack out the soldering iron or get a board, I bet its not in the gas or combustion section of the boiler so fair game to anyone to change.

Also the efficiency gain you get on a modern condensing is not that much, certainly won't pay for itself!

[Jimbob]

Thanks for all the advice.

Ideal say its too old for their fixed price service, shame as thats a cracking deal.
I agree, its likely the PCB, but he won't let me look / fix / swap
He is however coming round to fixing being much cheaper, and with zero change for the rest of the system.

We await this other company coming out to do their diagnosis next week.  (They quoted to do both, but are coming to see it first)