Protherm 80e

Discussion in 'Plumbing and Central Heating' started by sloaney, 10 Feb 2010.

  1. sloaney

    Joined:
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    Location:
    Cheshire
    Country:
    United Kingdom
    I'm a registered gas engineer, got called out to the above because of no C/H.
    The DHW side of things is fine.
    The system is pressurised to just over 1 bar.
    When trying to start in C/H mode the pump runs for about a minute then stops, the fan doesn't come on. There is no fault code displayed.
    The operation of the of the divertor valve is OK. The C/H thermistor had a resistance of 11000 ohms when cold which I thought was OK but replaced it with a new one (12500 ohms when cold) just in case, but this didn't make any difference. If I disconnect the wires from the thermistor I get an F2 fault - Thermistor failure again proving the thermistor is OK. The flow switch appears to be OK in that if I take it off the divertor valve I get an F0 fault telling me there is no flow.
    Is this proof enough that the PCB is at fault or am I missing something along the way?
     

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