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Just to add some other info. I have been trying to start the CH by using the HW overide button on the Programmer (with actuator removed) for about four hours with no joy. I have just tried to start it again five minutes after it would normally have been tripped by the programme i.e on at...

sorry my previous entry should read that it trips when i switch to CH and not HW as typed. sorry

So to recap.... I have cleaned the system. I have replaced the room Thermostat. I have replaced the Actuator. The boiler works but trips when i switch it to Hot Water (HW) I can get hot water and Heating when i remove the actuator and manually switch the three way valve round...

yes, that is what i was advised to use at B&Q.

Thanks to those who offered suggestions but i am afraid it is back to square one with this! I have flushed the system through (soaked for two days and then flushed through).....dirty water but not sludge came out. I have since changed the room thermostat (only because nothing was happening...

I have a problem with my Central Heating that i hope someone is going to say "thats definitely.......". It is one of those systems with a boiler behind the fireplace and the boiler and gas fire work fine (when they are running). the central heating wont come on via the timer as normal. When i...