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Hi James, I am just about to have a very similar system installed, including a Vaillant System boiler (the 630 in my case). However, my installer has recommended Honeywell controls, rather than the Vaillant ones - his implication seemed to be that English people are too thick to understand...

I thought the symptoms seemed electrical, so, being a professional electrical/electronic engineer, I had a good look at the PCB. I found cracked solder joints on two of the connectors - the one to the gas valve, and the one to the primary pressure switch. Once these connections were remade, the...

Hi, I have an Alpha CB28 combi, which has gone wrong for the umpteenth time in its short life... When the boiler starts, everything seems normal (the fan starts, and the pump starts) but instead of the gas valve opening and the igniter spark, I get both indicator lights flashing together...