On Fri, 8 Mar 2019 16:22:03 +0000, newshound
wrote:

On 08/03/2019 12:24, AnthonyL wrote:
I've been trying to understand what happens with the hot water when my
wife screams that it has gone cold in the shower so I watched it the
other day.

Turn shower on, burner comes on, led lights (Baxi 105HE) start to
light up to a maximum. Everything fine for a few minutes then the
burner turns off, leds go back, and wife screams. Burner comes back
on - repeat and rinse.

Shouldn't the burner flame just adjust to maintain the temperature
rather than cut-out? Obvious behaviour of the CH but not for DHW.

Otherwise is this indicative of a thermistor problem with hysterisis
or similar? Is it easy to replace?




I had that sort of problem from new with both a Vaillant and a Halstead,
admittedly in an older and rambling house with longish pipe runs. Given
up and gone to a proper system boiler.


I thought the Vaillant was a proper system boiler?

--
AnthonyL