Please briefly explain why you feel this question should be reported.
I replaced a johnson control thermostat a-19 for a sunstat dial #500710 four years ago
for a heated floor. Now just noticed connection and black wire behind sunstat burned and melted, what could be the cause? Thanks for your time.
Answer ( 1 )
Please briefly explain why you feel this answer should be reported.
Being that is was working for years it could really be a few things.
The first thing comes to mind is a bad connection. A bad connection will cause a high resistance and would get hot. Or you’ve bigger issues. Your transformer could be malfunctioning and putting out more than the 24 volts needed.
First I would put a tester on your transformer and look for 24 volts AC.
I mean, was the system working? how did you noticed it was melted?