I have recently had installed a Worcester Bosch Highflow 400 combi boiler
and have noticed that when a cold tap is run in the house the boiler HW
demand indicator lights briefly. Has anyone else noticed this. I assume
it's due to the drop in pressure on the cold water inlet fooling the boiler
into thinking there's been a demand for hot water - the hot water demand is
detected by a flow turbine in the cold water inlet so maybe it runs
backwards enough to trigger the boiler? Anyone else experiencing this. The
Worceseter technical helpline thought that my explananation was unlikely but
I can't think what else it can be.
Thanks for the responses. True enough it was due to a "dead leg" of pipe.
Our house is an ex B & B with basins in all the bedrooms. I found that one
of the taps hadn't been vented hence there was a leg of compressed air
forcing the water back when the cold tap was turned on elsewhere in the
house and thus fooling the hot water flow sensor.
It's nice when there's a logical explanation and I'm surprised that the guys
at Worcester hadn't heard of it.
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