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vaillant 937 ecotec boiler problem

Discussion in 'Plumbing and Central Heating' started by jc162, 15 May 2018.

  1. jc162

    jc162

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    I am having problems with my vaillant 937 ecotec boiler, approx 7 years old

    It will not give any hot water or heating and comes up with error code f.75 which says is the pressure sensor switch or pump.

    I can hear a low rumble noise from the pump also clicking as if to work and have changed the pressure sensor switch for a new one, but still not working:(.

    Have googled to see what else it could be. Someone has mentioned about the expansion vessel, I have deflated the vessel which blew out air fast at first then little dribble of water came out. when re pressurising the vessel at 1 bar the boiler will fire up but the temperature will shoot over 100 degrees and the pressure gauge rapidly goes up to 3 bar and shuts boiler down, not all the time though, i can also get it to fire up like this by opening the filler loop to 2 bar, then does same again with temperature and pressure.

    Any help appreciated
     
    Last edited: 15 May 2018
  2. easyflow

    easyflow

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    your initial problem was an easy fix, by deflating the EV you have now caused another problem.
    We cant give advice on here when it involves removing a front panel that is part of a room sealed unit.
    Get a GS engineer to sort the problem who will no doubt check the whole unit is in proper order.
     
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  4. jc162

    jc162

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    thank you easyflow for your reply, what are your thoughts for the initial problem, what problem would occur when deflating the EV and have recharged it, i am monitoring the pressure in the EV and dropped about 0.2 bar overnight.
    I have spoken to a engineer, who is coming to have a look, i am trying to get as much info as possible to aid.
     
  5. MTCH

    MTCH

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    Just tell the rgi what you've already done, should be enough for them to go on without any further input tbh.
     
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