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3 port valve motor scalding hot

Discussion in 'Plumbing and Central Heating' started by Bargain Bucket, 6 Nov 2019.

  1. Bargain Bucket

    Bargain Bucket

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    I've just observed that after no call for HW and CH for hours and with all the attached pipework now cooled down, the motor in the 3 port valve is scalding hot. Plainly it's being energised but I'd have thought it shouldn't be under these circumstances. Is my reasoning correct or is right that it is energised (and will presumably will remain so)?

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  3. CBW

    CBW

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    What position is it in? Is it just the valve that’s hot?
     
  4. Harry Bloomfield

    Harry Bloomfield

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    They do get very hot when trying to hold a stalled position against the return spring, they hold a stalled position on a reduced power to the motor. The heat is why they tend to be less reliable than the MOMO type of valve. That doesn't explain why your motor is hot, because with no call for any heating, then the motor should be completely unpowered.
     
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