Worcester 24CDI damaged Thermistor

Discussion in 'Plumbing and Central Heating' started by 1957Buck, 27 Jan 2019.

  1. 1957Buck

    1957Buck

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    Hi,
    During the changing of some O rings I accidentally damaged my Thermistor, the part has been ordered but not here yet,
    When I start up my boiler Locks Out after about 5 seconds and the radiator red light flashes about every second.
    Could someone please clarify that this would be caused by the damaged Thermistor and not something else.
    Thank you.
     
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  3. Gasguru

    Gasguru

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    Have a look in the installation manual, it tells you what the fault lights are indicating.
     
  4. 1957Buck

    1957Buck

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    Hi Gasguru,
    thank you, but I cannot see any relation to the thermistor causing this light flashing, nor the lock out, but this was the only thing damaged.
    Guess I will know when I get the new part and fit it.
     
  5. 1957Buck

    1957Buck

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    Gasguru,
    I have just double checked the manual: Light situation during fault, only Fail point H has the CH demand flashing slow, but nowhere in H are there any mention of the Thermistor.
    I am now looking further in Fail point I but have not done any tests yet, though Fail point I did not come up in the fault finding section for the CH demand flashing slow.
    This is why I posted the question in the hope that someone would say for definite that a damaged sensor would give this fault i.e. the flashing red light
     
  6. Gasguru

    Gasguru

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    CH light flashing once per second is burner lockout...a failure to light.
    CH light flashing 5 times per second is a thermistor failure.

    You have turned the gas back on?
     
  7. 1957Buck

    1957Buck

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    Yes, gas on, The boiler lights then goes off after 5 seconds then the CH light flashes once per second.
    My thermistor is actually cracked, the manual actually calls it a Domestic hot water sensor, but I have also heard it called the Thermistor
     
    Last edited: 28 Jan 2019
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  9. Gasguru

    Gasguru

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    Sounds like it's not detecting the flame...did you pull off the large connector on the pcb...the flame sense wire connects there.
     
  10. 1957Buck

    1957Buck

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    Yes, Im sure it went fully home but will recheck.
    Thanks
     
  11. 1957Buck

    1957Buck

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    Gasguru,
    Update. It doesn't make sense, I have just plugged it back in, turned it on and it's working, with the cracked sensor.
    I will still fit the new one when it arrives.
    Thank you for your help.
    Will keep you posted if anything changes.
     
  12. Gasguru

    Gasguru

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    I've had broken wires on that connector loom ie. the copper core was broken despite the insulation being unmarked...I guess a manufacturing fault.
     
  13. 1957Buck

    1957Buck

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    Strange.
    Hopefully sensor arrives tomorrow.
    Great talking. Best wishes.
     
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