Can anyone help, at wits end with fluctuating DHW temp.
Turn on a HW tap, get variable temp, lukewarm to warm, never 55 deg C as set, HW temp approx 30 deg C.
Looking at boiler (Vaillant combi 828/2E Ecomax) display when HW tap turned on, looks like burner kicks in for a few secs, HW outlet pipe gets hot, gas valve goes off therefore turning burner off, pipe goes cooler, then kicks in again. This cycle goes on, apprx 20secs on, 20secs off, giving DHW problem.
Anyone got any ideas, local plumbers about as much use as chocolate fireguard.
Turn on a HW tap, get variable temp, lukewarm to warm, never 55 deg C as set, HW temp approx 30 deg C.
Looking at boiler (Vaillant combi 828/2E Ecomax) display when HW tap turned on, looks like burner kicks in for a few secs, HW outlet pipe gets hot, gas valve goes off therefore turning burner off, pipe goes cooler, then kicks in again. This cycle goes on, apprx 20secs on, 20secs off, giving DHW problem.
Anyone got any ideas, local plumbers about as much use as chocolate fireguard.