Recent content by sbeavis

Received new control board yesterday, fitted it last night and all works perfectly again! :-) For the record the new transformer primary was 103ohms, old one 30. There's the problem. Melted primary winding enamel. Why it melted after working fine for 20 years I shall never know. At least...

I was unsure if "0,2" was 0.2 or 2, and was told by a Vaillant Engineer that it was 2. I was not happy doing it, but I trusted him and it made it work so I worried not. The replacement rectifier was a 2A bridge device and should be fine. I agree with you that the transformer has shorted it's...

The original fuse was marked "0,2A" which I took to be a German "0.2A". I replaced it with a 0.2 and it blew instantly, then a 0.5 blew, finally 1A held. I was then told by a guy on ebay who claimed to be a Vaillant engineer that it should be 2A and it is a common problem due to condensation on...

The pump is operating fine. The pump can operate in 3 modes: 1) "on when burners on", 2) "on when heating on", or 3) "always on". I operate mine in the second mode (keeps water circulating in the radiators after burners die down). There is a relay on the control board which switches mains to...

We have a Vaillant Sine18 combi boiler. Been in the house 4 years and it's just gone wrong for the third time. No hot water or heating. No main burners. The first problem 3 years ago was the pilot light not staying lit, which turned out to be due to the barbed spring in the flame failure unit...