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My system is similar to the one above, a back boiler, fully pumped sealed system with a two port motorised valve, thanks for your reply.

I used this as on the reviews someone had already used and said it worked fine

Just another question do I connect the pump live to signal for pump to work?

Thanks Simon Ill give that a go tomorrow and see what happens, the instructions for the switch timer are very poor.

Hi I have had the same problem with my boiler since it was installed over 10 yrs ago, its the last of the Baxi back boilers which still works ok. I have 13 radiators all have TRV's apart from two, one towel rail and a very small rad near downstairs toilet. All the TRV's are adjusted down, the...