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Thank you TWGAS and Expertgasman for your help. I had a gorgi guy out and it turns out it was the gas valve. Hopefully have it fitted by Monday or Tuesday.Just as well it hasnt been cold!

Thank you for your help. I shall investigate further

why do you think it fired up when I removed the timer front and refitted it. Thanks

Hi Kevplumb. when I remove the timer there are 9 terminals on the back plate of which the first 8 are used. the first 3 are earth neutral and live but I dont know which other terminal to connect to the live. can you tell me which one of the 6 other terminals is switched live thanks.

Hi thank you for your reply. there isnt a reset button on this model.apparently it is only on the ss model of this type. I have determined which pins have power. 2 and 5 have power but i am not sure which one is switched live, beside the earth neutral and live there are 6 other terminals...

Boiler hasnt fired up for over a week. I have checked the pump works the motorised valve works the pilot is lit. I have drained the system and back filled the system and blew it through. there is power to the boiler thermostat(no reset on this model). Tonight I removed the timer(horstmann 425...

Boiler hasnt fired up for over a week. I have checked the pump works the motorised valve works the pilot is lit. I have drained the system and back filled the system and blew it through. there is power to the boiler thermostat(no reset on this model). Tonight I removed the timer(horstmann 425...