Question about Heating & Cooling
You have a short in the low voltage...it could be the t-stat or the wiring to the t-stat...also could be the coil if a contactor, or a wire rubbed through somewhere...
To find it you need to start to isolate sections of the low voltage circuit and then ohm out each section...problem is that some will still not show up with out power applied... believe me this is not fun and can make ya pull your hair out...be patient and persistent...
but as you found out do not try a higher amp fuse...transformers work on smoke...and when the smoke comes out they no longer work... :-)
Posted on Sep 15, 2010
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Posted on Jan 02, 2017
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