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TROUBLESHOOTING
Your thermostat does not power on:
Check the following:
1. Turn off the power to your system. Check that all wires are properly
inserted into the terminal blocks at the thermostat.
2. Tug lightly on the wires to ensure they are not loose.
3. Ensure you turned the power back on to the equipment either at the
switch at the indoor equipment or the electrical panel (where you
originally turned off the equipment).
4. If your device still doesn’t power on check the AC voltage between
Rc and C or Rh and C using a multi-meter to ensure it is 24V AC.
5. If your device still does not power on, please contact:
d Technical support at 1.800.CARRIER or contact
contact.carrier@carrier.utc.com
6. Find an Expert Carrier Contractor at
www.carrier.com/dealers
Backlight will not come on:
1. If your thermostat is installed without a Common (C) wire and when
the battery is low, the backlight will remain off with button presses.
Error Messages:
1. Two dashes (--) appear in the temperature display.
d The thermostat must be replaced. The room temperature sensor
failed and all heating and cooling outputs will be turned off.
2. E4 alternately flashes with the temperature on the display
d The thermostat must be replaced. All heating and cooling outputs
will be turned off.
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