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Thanks, have just phoned my plumber and he's going to come and replace the motor in the next few days. He says £65 parts and labour, that's cheaper than if I was to buy a new Actuator (£115) and replace the head unit myself. If this doesn't solve the problem I'll let you know, otherwise...

Thanks for taking the time to reply. It's definitely a two-port valve (i.e. on a single pipe, no branching) rather than a 3-port valve (the central heating is controlled by a second, separate 2-port valve which is working fine). Does this mean that the head unit on my 2-port hot water...

Hi, please help! My hot water is NOT working from the boiler, although the immersion heater in the storage tank DOES work. A plumber that visited for other reasons (successfully replace motherboard on the Baxi Potterton Suprima boiler) advised that it looks like the Actuator (Honeywell...