Honeywell Thermostat with Trane Heat Pump, Blown Fuse

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- Honeywell Thermostat with Trane Heat Pump, Blown Fuse

Postby dollycind58 » Fri Oct 12, 2012 5:50 am

So interesting come to here!
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- Honeywell Thermostat with Trane Heat Pump, Blown Fuse

Postby Freon » Fri Oct 12, 2012 3:31 pm

Check at the air handler to see what terminal the Blue wire connects to. Sometimes it may be the Common. If your thermostat has no C (common) terminal (battery powered) then leave B disconnected.

Usually when the Aux heat is called for there's a relay with a 24 volt coil switching the 240 Volt power used for the Aux heat. I am assuming you have heat strips. It's possible the coil is shorted causing the fluse to blow when voltage is applied to the coil when there is a call for Aux heat. Check the control board for any signs of discoloration due to excessive current flow.
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