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892 posts

Ultimate Geek

# 255963 8-Sep-2019 20:43
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Had a ducted heat pump installed the other day.  All went well.  I opened the meter board the following day to check usage.  Closed it and it took a bit or wiggling to shut the door.


Went round did a bunch of stuff and just before I left the house noticed a cracking sound from the circuit board and then saw molten plastic dripping out of it and smoke.  Turned off the main supply and contacted the heat pump company.


They sent round an electrician who removed the bell, checked every thing, turned everything back on and it all worked.


So my question is why was this here in the first place.



Click to see full size


Circuit board with it removed


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2996 posts

Uber Geek

  # 2313246 8-Sep-2019 21:10
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It's not a bell, it's a 230v to 12v transformer often used for door bell circuits. It looks very used if it was installed recently. Did it have anything to do with the heat pump company?

892 posts

Ultimate Geek

  # 2313342 9-Sep-2019 05:42
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No it has been there since we got the house. For all I know it is as old as the house 1920.

Can't confirm it was the heat pump guys but it was fine beforehand. My guess is a wire was knocked or the black panel was out of alignment.

So it is a transformer. Makes sense I guess.



6964 posts

Uber Geek


  # 2313346 9-Sep-2019 06:40
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Yep, just a bell transformer, very common in homes up to probably early 2000 when electronic options came about.



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