Coleman Furnace Model # G9t08012upb13c

3 Amp fuse keeps blowing. We tested board and the amperage cosistantly above 3 Amp rating. Why is this happening and how can we fix it?

Something in the low vlotage control system is drawing too much power. You will need to isolate each control to see which one is causing the problem. Thermostat wiring rub through,contactor coils, and relays are the probable cause but you never know exactly what you will find.

Quote:

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Originally Posted by hvac1000

Something in the low vlotage control system is drawing to much power. You will need to isolate each control to see which one is causing the problem. Thermostat wiring rub through,contactor coils, and relays are the probable cause but you never know exactly what you will find.

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Thank you HVAC1000! I don't really know how to isolate each control but I will be doing some more surfing and reading to see what I can figure out. :) Luckly it hasn't been too hot this past week but I think time is running out for the A/C to be down. Thanks again for your info.
Take care,

Good hunting.