Any advice much appreciated.
Unlike other problems noted on the site about this boiler, this one produces DHW fine but will after a day or so will cut out the central heating and show F22. After switching off for awhile and back on usually works fine for a day or so(Both heating and dhw) then back to F22. Have thoroughly flushed with cleaner and water is clear no sludge, changed diverter valve, but same problem.
The pump works fine when running domestic hot water for ages, I have noted when it has gone to F22 and you try to restart it without waiting it attempts 3 times, almost as if the pump or something is trying but then cuts out. Pressure in system is fine 1.5 no leaks. Could replace pump or could the APS be better bet first?
Unlike other problems noted on the site about this boiler, this one produces DHW fine but will after a day or so will cut out the central heating and show F22. After switching off for awhile and back on usually works fine for a day or so(Both heating and dhw) then back to F22. Have thoroughly flushed with cleaner and water is clear no sludge, changed diverter valve, but same problem.
The pump works fine when running domestic hot water for ages, I have noted when it has gone to F22 and you try to restart it without waiting it attempts 3 times, almost as if the pump or something is trying but then cuts out. Pressure in system is fine 1.5 no leaks. Could replace pump or could the APS be better bet first?
