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So Vaillant will charge me £95 for the call out. We had the boiler serviced by the installers who put it in - not Vaillant direct.

Ok, the Vaillant engineer has just been and gone, and its not (for me at least) good news. The flue collector at the back has developed a crack (which apparently they do with age) and has leaked condensate into the boiler. This has then turned to steam and cooked all the electronics in the...

Alright tiger - keep your hair on. In fairness - i thought you were taking the pi$$ with the above advice. In the end i called out Vaillant for a fixed price repair - once they have diagnosed and (hopefully) fixed it, i will update the thread, as i agree with you - nothing more frustrating than...

So this evening I have finally managed to do some checking of the wiring as suggested by gasguru. Following the boiler having fired up for the last two days, today it decided again that it was not in the mood. So, first I opened up the wiring box underneath the boiler and swapped the incoming...

Did you ever get anywhere with this? My boiler is doing similar and my regular heating engineer is stumped

Thanks for your replies. I have had a look at the PCB and all the connectors are attached as per the photo Gasguru was kind enough to post. I wasnt able to get to the connection box last night - i will try this evening. However, I am assuming that the 230 controls interface board is the same...

Sadly it's older than that. In a further update, we've had our engineer out again and he replaced the option board, but no change. He spoke to Vaillant who had him checking various parts of the boiler. The supply to the option board (green connector) appears to cut out when the pump goes off...

Hi all, I'm hoping someone here can point me (and my heating engineer) in the right direction with this. I have a Vaillant ecoMax Pro 28e boiler installed and for years she has done us proud. Recently however, it's developed an odd fault. Every 3 or 4 days it just refuses to fire, but doesn't...