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hi my baxi solo 3 50 pf is now overheating the system is 8 years old engineer replaced pcb I replaced thermister, overheat thermostat, room thermostat, mid point actuator. When i replaced the room thermostat the boiler ran ok about 2 days on both hw and ch any ideas please. forgot to mention...

thankyou all for your help here is a bit more detail changed water tank thermostat actuator changed have not yet changed boiler thermistor have not changed room thermostat I put the boiler on and after half an hour the pump stopped working the boiler was still going and started...

I hope one of you kind people out there can help me . The pipes start to hammer after half an hour of CH or HW or both. overheat on the boiler then needs to be reset pump is working midpoint actuator is moving engineer changed pcb problem still occuring its a baxi solo 3 50 pf help...