I have a Valliant Ecofit Pure boiler in a small flat and only have 3 radiators on usually. Recently I've had to top the water up about once a month when I get F22 notice and the boiler shuts down. It's a simple operation described here:
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Before I call out a plumber, what should I do about this? It's no bother to top up the water but I wonder if there's a leak and if so where? And is it progressive - likely to get worse?
Well, it certainly will not get better until found and fixed :-)
...and each time you top it up, it dilutes the inhibitor so sludge and rusting radiators more likely.
There will be a pipe which ends outside, with its end open pointing at the wall, probably at the back of the boiler. Fit a sandwich bag over the end, with an elastic bag over it to keep it in place, leave it in place and report back if it collects any water over several days?
Check all radiators, valves and pipework for rusty marks and staining from leaks. Check ceilings on floor below, for signs of leakage from pipes under floor.
A lot of plumbers install safety valve blow off turned back to face the wall, putting plastic bag over t hat will tell you if the valve is letting out water .... would eliminate one possible cause.
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