Hot Water Does Not Heat Up Unless Central Heating Is On

Discussion in 'Plumbing and Central Heating' started by dwarfer16, 8 Oct 2014.

  1. Agile

    Agile

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    I would never suggest replacing the whole pump assembly and particularly when there is no direct evidence that there is any fault in it.

    Its easy to see if both pump heads are turning. See FAQ.

    Its still possible to buy that type of pump head and replace just that.

    If so then it needs removing so the non return valves may be checked and the pump impellers checked for blockages. Its easier to first remove each pump head first.

    Tony
     
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  3. dwarfer16

    dwarfer16

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    Thanks for the info.

    As an update, today I checked the pumps head as per the instruction manual. The central heating one was spinning no problem but the water pump was jammed. I had to really turn it quite hard with a screwdriver and eventually got it moving. When I turned the power on to check them the water head didn't turn as quick as the CH pump but the water wasn't flowing through yet so I am thinking that whatever was blocking the pump hadn't been 'pushed' through yet. After turning the water back on the water took a while to get through and it did cause the boiler to overheat again but after turning that off and on again I'm pleased to say that water is flowing through fine now. It has been on for 30 minutes now and still going. What is weird though is that the radiators are NOT coming on when the water is on now yet after the plumper flushed the system the radiators were coming on at full power even when just the water was on. I can't really explain that.

    I can only think that there was a blockage in the pipe and, presumably, the blockage is still passing through the system so I guess it is likely that I could have the same issue again. If it does happen again should I try to dissemble the pump to clear the blockage? That is if the pump head isn't turning again like this time.

    Thanks, Craig.
     
  4. CombustionGuy

    CombustionGuy

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    Just a note

    Cy
    Under stat is upside down :)
     
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    DIYnot Local

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