Worcester Bosch 240RSF combi boiler.
Soft water, high mains pressure.
Here's the problem:
I had replaced the pump head a couple of weeks ago as the old one's bearings were worn.
Simple enough job:bled radiators, vented pump. Heating & hot water from the kitchen taps operating nicely. The cold pressure was about 1 bar and when operating was around 2 bar with no fluctuations.
All OK for a couple of days.
Then when running a bath, the water was initially hot and then cut out. Tried with all the rads off, but no change. Now the heating wouldn't operate either.
Remembered a previous fault when I replaced the diverter valve, so I cleaned out the valve, and replaced the diaphragm which was rotten and worn through.
Filled the system, bled rads, etc, all water tight. Diverter Valve operates when hot tap turned on, but - still no heat or hot water.
Pilot light is on, but burner doesn't fire up when demand is created.
I've tested the pump electrically and it's working.
I've also noticed that the green 'demand' light on the front panel does not light up regardless heating or hot water demand.
The problem I would guess is electrical, but how do I decide where the fault is? Operating switch appears OK, can't see any loose connections.
Can anyone advise, please? :?
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