worcester bosch 240 combi, no hot water

saintsman · 8 Sep 2009

I recently replaced the diverter valve and everything has been fine until now. When I turn on hot tap the demand light comes on, the boiler fires up, but the water temp after 10 mins of running does not get above lukewarm.
Occasionally the demand light and boiler do not come on with tap running.

Help

kevplumb · 8 Sep 2009

when you run the water are the heating pipes getting warm

saintsman · 8 Sep 2009

They have been in the past but I will check

saintsman · 8 Sep 2009

Some heat in the pipes but not a lot

Agile · 8 Sep 2009

How long ago did you replace the diverter?

Tony

saintsman · 8 Sep 2009

2 or 3 months ago

saintsman · 8 Sep 2009

Just done another tap run the water is still lukewarm, full flame in the window, but it seems that the flow rate is faster. Now to me if the rate is faster then the water is not going through the system slow enough to heat it fully, is there such a thing as a flow rate inhibitor, or does the diverter valve sort all that out?

nickso · 8 Sep 2009

check the flow rate. if you dont have a flow cup and dont want to shell out for one get a measuring jug, run tap and see how many litres the tap provides in a minute, not 100% accurate but better than nothing. some gianonni valves have a flow rate adjustment on the front of the diaphragm housing, small black plastic screw. its only a quarter turn from fully open to fully closed and they often leak if they havent been used for a while, your should be ok if its new.

also, "full flame in the window" is not a good measurement of actual burner pressure or gas rate.

saintsman · 9 Sep 2009

I removed the "new" diverter valve but saw that a pin was bent inside, so have replaced it again.
HOWEVER
Now water pressure at taps is almost non-existent, pilot light keeps going out both on central heating and water, if it does stay on and fire up it goes out after a short while, there is no demand light for water, water heats up very very hot when and if central heating stays on

clf-gas · 9 Sep 2009

saintsman said:
I removed the "new" diverter valve but saw that a pin was bent inside, so have replaced it again.
HOWEVER
Now water pressure at taps is almost non-existent, pilot light keeps going out both on central heating and water, if it does stay on and fire up it goes out after a short while, there is no demand light for water, water heats up very very hot when and if central heating stays on

This has got to be telling you something now then surely

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worcester bosch 240 combi, no hot water

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