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Old 18 October 2009, 19:38   #1
subarujimmy
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Default Central heating-but no hot water.

I've got a heating system with hot water tank.

I recently drained the heating to fix a leaking rad, bled it back up, and thats fine. However now the hot water isn;t getting warm.

The boiler lights and pipes get warm, but the water itself isn't geting warm.

Any help/ideas would be great.
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Old 18 October 2009, 21:06   #2
digga
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have you got all the air out of the system???
could be something as simple as that???
does the tank get up to normal temp?
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Old 18 October 2009, 21:29   #3
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I've bled the pump, and the water pipes leading from the boiler are getting hot, they are hot at both sides of the blocks with wires going too them.

And the tank doesn't get warm at all, and neither do the pipes going to it. :-(
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Old 18 October 2009, 21:40   #4
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so u got hot water leaving the boiler on its way to tank.....but for some reason it not getting there hmmmmmmm

have you got a flow and return system???
if so maybe worth checking no air locks on the return
are you gettin hot water tank side of pump??
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Old 19 October 2009, 09:17   #5
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Do the radiators get hot?

This will almost certainly be due to an airlock.
First bleed all the radiators again, if that fails then it may need to be back flushed. To do this you need to connect a hose to the heating system and give it a short blast of mains pressure water.

Alternatively if the heating is working then possibly the motorised valve has seized in the heat only position. This can be manually moved back to the central position.
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Old 19 October 2009, 20:07   #6
subarujimmy
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Yeah, the boiler is heating the water, and its leaving the boiler, but not getting warm at the tank.

The radiators/central heating itself is working fine. All the rads are hot.

How would I clear an airlock from the water pipes??? Any ideas???
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Old 19 October 2009, 22:34   #7
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bleed flush or backflush the system

your tank must be seperate from rads/central heating am assuming you got no hot water at taps in the bathroom?
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Old 20 October 2009, 09:22   #8
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Check that thezone valve or 3 port valve is free and not sticking. Bit of muck might have got stuck in it during drain drown.
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Old 20 October 2009, 09:22   #9
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Definately air locked

Try turning off all rads and maybe try to bleed it at the boiler/pump end
Thats what happened to my own system recently

I didn't do any of this - the plumber and his little apprentice did.
Pump was noisy as hell, he ended up cracking open the nut at the pump and bleeding that way.

Last edited by urban; 20 October 2009 at 09:25.
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Old 20 October 2009, 09:28   #10
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You havent turned the thermostat on the bolier/tank down have you? if thats turned down then water wont heat up.

sounds like an airlock but that is also an option
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Old 20 October 2009, 09:28
 
 
 
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air, back, boiler, central, drained, gotno, heating, hot, ive, radiators, reason, reasons, system, warm, water, working, works


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