My honeywell thermostat is showing a code of -AC

remory Posts: 1, Reputation: 1

New Member

Jan 14, 2007, 11:32 AM

My honeywell thermostat is showing a code of -AC

My honeywell thermostat is showing a code of -AC what does that mean?

foghorn Posts: 1, Reputation: 2

New Member

Jan 30, 2007, 12:13 AM

Thermostat is operating on backup batteries until the unit is mounted on the wall plate and the system is powered.

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