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Pic attached. Other than the pcb there appears to be little else accessible for servicing. To remove the expansion tank, which is not accessible looks as though complete disassembly of the boiler unit would be necessary. An expensive and probably not cost effective thing to do. Do you know what...

Hi Ian, thank so for your reply. the tank is actually small silver tank see photo and there is no indication anywhere that it needs to be serviced. There was no service schedule with the boiler, and it’s not obvious how it could be serviced. Jethro

Hi this beastie, installed in 2011 has been working fine supplying underfloor heating. Yesterday the red light came on and the water pressure was reading 0.6 bar according to the little meter. This hasn’t happened previously since I normally top up from the water mains in October and February. I...