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Carrier Comfort Zone II Thermostat is blank and the 3 companion thermostats are all showing Error Code C1. What does that mean?

Posted by Anonymous on

  • Brandon Wadley
    Brandon Wadley Jul 01, 2015

    I am having the exact same issue, how did you solve? My HVAC repair man isn't able to fix it and I don't know what else to do.

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  • 21 Answers

Hi Anonymous,
For all wall mounted and Artcool split system codes

Error code = C1 or CH1
Flashing Light = 1
Fault = Indoor temperature sensor open or closedcircuit.
Display = Indoor.
Indoor Operation = ON

Error code = C2 or CH2
Flashing Light = 2
Fault = Outdoor temperature sensor open orclosed circuit.
Display = Indoor Outdoor.
Indoor Operation = ON

Posted on Feb 15, 2015

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