Apologies if the answer is already on here, I did search, but anyway...
Alpha CB28, heating side is fine, but on the dhw side
turn hot tap on, boiler fires up for about 40-50 secs (hot water starts coming through tap) then cuts out for about 10 secs before reigniting after which everything is fine.
If I restrict the flow down to 4-5 l/min it doesn't cut out.
during the period it cuts out the red(A)led is constant, and green(B) led flashes quickly. According to the manual this indicates pump failure, which makes no sense regarding the above??. The fault was intermittent but has now become persistent which seems to indicate mechanical wear.
The first thing I did was to replace the dhw flow switch, which was well worn but it made no difference.
I would really appreciate advice as the last time it went wrong it cost me £300 just to get the fault diagnosed, (diverter valve, completely different symptoms)
Many thanks to all of you who freely help and advise!!!
Alpha CB28, heating side is fine, but on the dhw side
turn hot tap on, boiler fires up for about 40-50 secs (hot water starts coming through tap) then cuts out for about 10 secs before reigniting after which everything is fine.
If I restrict the flow down to 4-5 l/min it doesn't cut out.
during the period it cuts out the red(A)led is constant, and green(B) led flashes quickly. According to the manual this indicates pump failure, which makes no sense regarding the above??. The fault was intermittent but has now become persistent which seems to indicate mechanical wear.
The first thing I did was to replace the dhw flow switch, which was well worn but it made no difference.
I would really appreciate advice as the last time it went wrong it cost me £300 just to get the fault diagnosed, (diverter valve, completely different symptoms)
Many thanks to all of you who freely help and advise!!!