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Cheers Agile, The system seems to work perfectly when switched on though, plenty of heat/flow to either CH or HW, the problem just seems to occur when the system is up to temp? All advice appreciated D

Cheers beerlover, The pump is wired to the boiler and if switched off then it continues to run for a while i.e. overun. It has 2 2-port valves and and a bypass valve but not sure how/if this is set. How can I check? Serviced 6 months ago just before house purchase. Any tests or checks I...

Hello, I have a Potterton Suprima 30L CH boiler, works fine when switched on, boiler fires up, ignites and heats water. When the required temperature is reached it unfortunately goes wonky. The red light is on to signify it has reached the the required temp, after a second or two it goes out...