DIY Doctor

CH working but no HW

Postby Douglas1 » Sun Jan 02, 2011 10:35 am

We recently had burst pipes while away for christmas which are now fixed, the heating system is working and we have bled all the radiators but are only getting luke warm water upstairs which was working before. We have switched the heating off and boiler is firing up but still no more than lukewarm water. Any suggestions would be appreciated. PS Not experienced DIYers!
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Simply Build It

Postby jim the plumb » Sun Jan 02, 2011 7:47 pm

You didn't say whether the heating pipes burst or the cold mains/ hot water pipes burst.

What boiler do you have? I'm guessing you have a combi boiler?

Check controls on boiler - is the hot water knob (if fitted) turned up?

If it was a cold mains pipe, there may be dirt that has partially blocked the plate heat exchanger in the boiler.

If you run the hot tap on full, does the burner on the boiler go on/off and on again every so often? If so, the thermostat is low or the plate heat exchanger may be blocked. It may be blocked on the heating side and/ or the hot water side.

If it's not a combi, I would guess there's an airlock in your cylinder coil after the system was drained.

HTH jimbo
jim the plumb
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