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New guy immediately identified a fault on the PCB - Board replaced and system is working as advertised. Makes you wonder why the first guy didn'tfind it (on either of his 2 calloiuts and teh servicing)

I've called another Corgi registered engineer and the first thing he said was it sounded like the fan breaking down.

My Sons central heating boiler - Gloworm Fuelsaver 35F running hot water and 6 radiators in his flat - starts OK form the timer then heats the radiators then shuts down, when the temperature drops it will not relight till the system (and the flat) is stone cold. We have had a Corgi engineer out...