If it is the blown air side of things I disconnected the room stat, the two wires (in my case yellow), which connect on the control circuit board at the top centre. If the thing runs at a high speed on the circulation fan with this disconnected changing the room stat cured that problem. https://www.ebay.co.uk/itm/183839108044Yes, you got the right boiler. It switches on but goes off a few minutes later.
No it doesn't heat the water.If it is the blown air side of things I disconnected the room stat, the two wires (in my case yellow), which connect on the control circuit board at the top centre. If the thing runs at a high speed on the circulation fan with this disconnected changing the room stat cured that problem. https://www.ebay.co.uk/itm/183839108044
Does it heat the water when switched to a non blown air position?
Cheers
H
Checklist then I reckon. As Pudsey says, be sure of your gas supply and that there is no red light showing on the left hand side of the controller. The drop out voltage for the unit is actually quite low in theory but it may help if you try the boiler with your engine running just to be sure you have a good 13v plus at the boiler if you don't have a multimeter. From memory, the red light only indicates gas supply problems on the C3402. Is the flue clear? Can you hear the combustion fan running and a click and a muffled whumph when the gas ignites? And, at the risk of being a PITA, is the boiler full because it will kick out on water only use if empty, or should do. The space heating side, if it runs ok, will heat your water to some extent when set to heating only (first click clockwise from off on the controller)No it doesn't heat the water.
Can’t argue with that. You know what it’s like, put leisure in front of the article and the price doubles.Stupid price, you'd get a fantastic Combi for home for less.
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I second that as my boiler did exactly the same thing I got that little black button changed and it’s worked fine ever since.If it is the blown air side of things I disconnected the room stat, the two wires (in my case yellow), which connect on the control circuit board at the top centre. If the thing runs at a high speed on the circulation fan with this disconnected changing the room stat cured that problem. https://www.ebay.co.uk/itm/183839108044
Does it heat the water when switched to a non blown air position?
Cheers
H