What to do if my Carrier Thermostat display is blank?
If your Carrier Thermostat display is blank, it indicates a lack of proper power. Ensure the power to the furnace is on and that you have 24VAC between R & W. If C is used, verify 24VAC between R & C.
What to do if my Carrier Thermostat air conditioning does not turn on?
If your air conditioning doesn't turn on, it might be due to: 1. The compressor timer lockout preventing activation for a certain period. Consult the Owner's Manual in the Setup section to defeat the cycles per hour and compressor timeguard. 2. The cooling setpoint being set too high. Consult the Owner's Manual in the Setup section to lower the cooling setpoint limit.
What to do if my Carrier Thermostat heating does not turn on?
If the heating doesn't turn on, the heating setpoint might be set too low. Consult the Owner's Manual in the Setup section to raise the heating setpoint limit.
How to fix Carrier P474-1050 when heat comes on instead of cooling in heat pump mode?
If you're controlling a residential heat pump and the heat comes on when you're asking for cooling, it's likely that 'heat pump' is not selected 'on' in the Advanced Setup. To resolve this, select heat pump on during Advanced Setup programming. Consult the Owner's Manual.
Why does my Carrier P474-1050 Thermostat repeatedly try to turn on but fails, and the display dims?
If your Carrier Thermostat tries repeatedly to turn on but cannot, and the display dims or disappears when using 4 wires (R, G, W, Y), it means there isn't enough power available. To fix this, connect a 270 ohm, 10 watt power resistor at the furnace as shown in the manual.
What to do if both heat and cool turn on when calling for cooling on my Carrier P474-1050?
If both the heat and cool turn on when calling for cooling, the Advanced Setup is probably configured to control a heat pump, but the HVAC thermostat is controlling a conventional (non-heat pump) system. Consult the Owner's Manual in the Advanced Setup section to turn off the heat pump.
General| Category | Thermostat |
|---|---|
| Model | P474-1050 |
| Type | Programmable |
| Display | Backlit LCD |
| Wi-Fi Enabled | No |
| Energy Saving Mode | Yes |
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