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The flow switches are the most common fault on this boiler which i have experienced and they may well have only been replaced 12 months ago but if the system is dirty and has not been cleaned correctly then the debris and sludge can get into the flow switch and cober the moving magnetic part of...

I know a few lads who have installed the vaillant 937 and they can only give it total admiration and have said the hot water flow rate is superb and easily manages to cope with two bathrooms. Remember though it is quite a big and heavy piece of kit so any wall fixings must be capable of the...

IMO it sound like the gas valve is not letting through gas to the main burner. If the boiler ha snot been used for a whuile it may be stuck closed. BUT... it is also possible that the grey push button has not been fully released back out.? If you lit the pilot you may find the grey puch...