Can't figure out emergency heat for GC-TBZ48


Old 07-04-17, 08:50 AM
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Can't figure out emergency heat for GC-TBZ48

I just moved to a new house and I am trying to hookup my GC-TBZ48 to a heat pump system that has emergency heat. The manual mentions it several times but does not tell me how to wire it. The old thermostat is a rth3100c. The A/C unit label is to faded to read.

Old on left new on right

I need to know where E and Aux should go. Thanks
Old 07-04-17, 09:00 AM
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AUX goes on W1 and E is not used. Tape off E wire.
Old 07-04-17, 11:05 AM
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Welcome to the forums.

If you go to the air handler and check.... you'll usually find the E and aux wires connect to the same point.

You will need to go to Advanced System Settings and turn on the AUX heat.

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