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Potterton Promax 15HE Boiler -relay clicking problem

Discussion in 'Plumbing and Central Heating' started by km321, 8 Jan 2010.

  1. km321

    km321

    Joined:
    8 Nov 2009
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    Location:
    Kent
    Country:
    United Kingdom
    Hi, Need some help please.
    A 6yr old Potterton Promax 15HE on an unvented boiler installation has suddenly stopped heating both DHW & CH. Had worked well without issues for 6yrs. Now when reset, fan starts up and runs while boiler does not fire up but has a relay on the ignition PCB clicking in & out for about half a dozen times and then locks system out. On checking found the following :-
    -there is sparking on the electrode after reset;
    -condensate trap was half full of water - drained this;
    -gas valve (& hence gas feed) not receiving voltage, seems it is being inhibited by clicking relay action;
    -resistance measurement cross various devices shows:- flow switch 11.63 kohms (not shorted so possibly ok); Thermistor 3.35kohms (within reqd range of 0.5k~20kohms so ok); safety thermostat 0.3ohms (seems ok); fan protection thermostat 0.3ohms (seems ok);sensing electrode high resistance to earth (not sure if this is ok).

    Would greatly appreciate guidance on what to do next or advice on what may be wrong.
    Many thanks. : :(
     
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  3. km321

    km321

    Joined:
    8 Nov 2009
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    0
    Location:
    Kent
    Country:
    United Kingdom
    Hi. Happy to advise to those interested or with similar symptoms that above problem now solved by replacing the Buccleuch Electrodes. :)
     
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