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Ideal classic ff250 overheating after switching off.

Discussion in 'Plumbing and Central Heating' started by Robert Perkins, 30 Dec 2020.

  1. Robert Perkins

    Robert Perkins

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    Hi all

    I have an ideal classic ff250 which has been intermittently switching off by way of overheat stat popping out over the last 6 months or so. I've now come to realise it seems to only happens after the boiler has turned off (due to reaching correct temperature on room thermostat or water reaching correct temperature).

    Any ideas? I read in a different thread that the gas pressure may be too high. Does it sound reasonable. Or perhaps I need a new overheat stat?

    Many Thanks
     
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  3. muggles

    muggles

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    More likely to be a faulty pump
     
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  4. Robert Perkins

    Robert Perkins

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    Thanks for the response. Wouldn't a faulty pump mean it would overheat when the boiler was running rather than when it stopped? As far as I'm aware ideal classics don't have an overrun.
     
  5. ianmcd

    ianmcd

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    Great boilers, most likely cause is the thermostat sensor, definately not the over heat thermostat, is it on a Y plan or an S plan ?
     
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  6. Robert Perkins

    Robert Perkins

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    Hi Ian. Thanks for the response. Its on a Y plan- does this make a difference to your advice?

    So would replacing the thermistor sensor lead be a sensible idea? Do you know the part number by any chance?

    Thanks
     
  7. ianmcd

    ianmcd

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    137658 is the part number, be patient when removing the old one they can be a bit seized in, tell your engineer to do it with the heat exchanger hot and gently pull, or it will snap, you will need heat sink paste for re-fitting the new one
     
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