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Combi bolier pressure too high and water has gone cooler

Discussion in 'Plumbing and Central Heating' started by sinoakes, 4 Feb 2014.

  1. sinoakes

    sinoakes

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    Hi All,

    My water from my combi boiler all of a sudden has gone from kicking out hot water to luke warm.

    I checked the bolier and saw that the settings were all at the same level as they had always been set to but the pressure was up from 2 to 3 (when not firing).

    I turned the system off and bled some water out using the radiator value on one of the rads to get the pressure down but this did not fix either problem. The pressure went back up again the next day or so and the water is still not hot.

    The filling loop is in the closed position.
    The radiators get scolding hot still too (the 60 deg light is illuminated) but when a tap is turned on, the boiler seems to stop working and drop the temp down (the boiler lights go to 30 or 40 deg instantly).

    Has anyone got any ideas or should I just get an engineer out asap.

    Thanks

    Simon
     
  2. gigz

    gigz

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    Drain it again and disconnect the filling loop all together as the valves may be passing.
     
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  4. sinoakes

    sinoakes

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    Thanks gigz, do you think I should drain it completely or just enough to drop the pressure to 1.5-2?

    Do you think this could help with the water not coming out hot from the taps?
     
  5. gigz

    gigz

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    Drain it (vent it first) to about 1 to 1.2 when cold. Dont think it has anything to do with your HW problem though. This time of year its usual for a combi to give out cooler water (at the same flowrate). Try slowing the tap down and see if it gets better. What boiler do you have ? Guessing a baxi 105 ?
     
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