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Troubleshooting
Troubleshooting
If the display does not turn on:
1
Check terminals R and C on the thermostat base.
2
Verify power is 24 Vac +/-10%.
3
Verify that the green LED on the base is flashing at 1 Hz.
NOTE If the green LED is not flashing and you do have 24 Vac on terminals R and C, you need to replace the
thermostat.
Outputs based on demand and configuration
The following table shows the outputs based on demand and configuration.
Demands Stages
Fan Only
Cool 1 (A/C)
Cool 2 (A/C)
Cool 3 (A/C)
Cool 1 (Heat Pump)
Cool 2 (Heat Pump)
Dehumidify
Cool 1 and Dehumidify
Cool 2 and Dehumidify
Heat 1 (A/C)
Heat 2 (A/C)
Heat 1 (Heat Pump)
Heat 2 (Heat Pump)
Heat 3 (HP w/Emerg Ht)
Heat 4 (HP w/Emerg Ht)
Heat 1 and Dehumidify
Heat 2 and Dehumidify
Carrier Connect™
Wi-Fi Thermostat
Installation Guide
Y1
Y2
W1
W2
Off
Off
Off
Off
On
Off
Off
Off
On
On
Off
Off
On
On
Off
Off
On
Off
Off
Off
On
On
Off
Off
Off
Off
Off
Off
On
On
Off
Off
On
Off
Off
Off
Off
Off
On
Off
Off
Off
On
On
On
Off
Off
Off
On
On
Off
Off
On
On
On
On
On
On
On
On
Off
Off
On
Off
Off
Off
On
On
Carrier Proprietary and Confidential
G
*3rd
*Dehum
Stage
Cool
On
Off
X
On
Off
X
On
Off
X
On
On
X
On
X
X
On
X
X
On
X
On
On
X
On
On
X
On
On
X
X
On
X
X
On
X
X
On
X
X
On
X
X
On
X
X
On
X
X
On
X
X
38
*Hum
*Rev
*Rev
Val=0
Val=B
X
X
X
X
X
X
X
X
X
X
X
X
X
On
Off
X
On
Off
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Off
On
X
Off
On
X
Off
On
X
Off
On
On
X
X
On
X
X
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