I have a five-year old Valliant combi boiler, and inherited a 'warm sure' boiler maintenance scheme with house, so do not have to pay for call outs or spare parts.
The boiler has been malfunctioning for more than a year now, with hot water going cold after a few minutes, then coming on again warm, then cold. The first engineer, who came three times, didn't seem to have much of a clue, but replaced a few parts and the warm water wd work well for a week or two then revert back to bad old ways.
Finally warm sure started sending out a Valliant guys, the first one said that the system needed a power flush to correct problem.
Second guy says there is a prob a leak in c heating system system which is causing boiler to overheat so it cuts out. He says leak needs to be found (he wouldn't try to find it...) and then system needs a flush. I'm not sure if he really knew if this was the fault as he was on phone to other engineer asking for advice...
Both seemed to think that boiler was not at fault. Thermo was replaced and found not to be at fault.
Obviously power flushes and so on cost $$$ and might not even remedy the prob. I'd really appreciate some advice about the best course of action, simple things I can check myself. Where do I begin checking for leaks? And problem solving?
thanks for any advice
Fiona