To Next PageTo Next PageWhat to do if my Carrier DEBONAIR 33CS displays 'Service Filter'?
If your Carrier Thermostat displays the ''Service Filter'' message, it means the configured number of blower operating hours has been reached, reminding you to replace the filter. To clear the message and reset the blower operation timer to 0 hours, reset the Service Filter feature.
How to fix Carrier Thermostat when using 4 wires and heating equipment tries repeatedly to turn on?
If, when using 4 wires (R, G, W, Y), the heating equipment attempts repeatedly to turn on but fails, and the Carrier Thermostat display dims or disappears, it suggests there is not enough power available. To resolve this, connect a 270 ohm, 10 watt power resistor (supplied with the thermostat) at the air-conditioning equipment between terminals Y and C (for non-heat pump applications only).
What to do if cooling will not turn on with Carrier DEBONAIR 33CS Thermostat?
If your Carrier Thermostat's cooling function won't activate, first, ensure that you've selected COOL mode. Then, decrease the cooling set point to 10 degrees below the current room temperature. Check for 24 VAC at the Y1 terminal with a load connected. If the voltage is present, the thermostat is likely functioning correctly, and the problem lies with the wiring or the equipment itself. If 24 VAC is not present, consider replacing the thermostat. Also, verify the Compressor Cycle per Hour Limit, as cooling may be locked out.
How to fix Carrier Thermostat when heating won't turn on?
If your Carrier Thermostat's heating isn't working, make sure you've selected HEAT mode. Increase the heating set point to 10 degrees above the room temperature. Check for 24 VAC at the W1/O/B terminal with a load connected. If the voltage is present, the thermostat is working as expected, and the issue is likely with the wiring or equipment. If 24 VAC is absent, you may need to replace the thermostat.
What to do if Carrier DEBONAIR 33CS Thermostat display dims when heating turns on?
If your Carrier Thermostat display dims or disappears and the heating equipment tries repeatedly to turn on when using 4 wires (R, G, W, Y), it indicates there is not enough power available. To solve this, connect a 270 ohm, 10-watt power resistor at the air-conditioning equipment between terminals Y and C (for non-heat pump applications only).
How to fix Carrier DEBONAIR 33CS Thermostat display when it is not illuminated?
To troubleshoot a Carrier Thermostat with a non-illuminated display, check for 24 VAC at the R terminal connection. The R terminal must be connected for the thermostat to operate correctly.
What to do if resistor labeled “L3” on Carrier Thermostat is burned out?
The thermostat has been wired incorrectly and the circuit board is burned out. Thermostat must be replaced.
Why does heat come on during cooling cycle when controlling a heat pump with Carrier DEBONAIR 33CS?
If heat comes on during the cooling cycle when you are controlling a heat pump with your Carrier Thermostat, you need to configure the thermostat for heat pump operation (Table 2, Step 4).
What to do if the Carrier Thermostat heating will not energize?
If your Carrier Thermostat isn't activating heating, first, ensure you've selected Heating mode. Next, increase the heating set point to 10 degrees above the current room temperature. Check for 24 vac at the W1-O-B terminal with a load connected. If the voltage is present, the thermostat is likely working correctly, and the issue lies with the wiring or equipment. If 24 vac is absent, consider replacing the thermostat.
Why does my Carrier Thermostat heat turn on during cooling cycle?
If your Carrier Thermostat is controlling a heat pump and heat comes on during the cooling cycle, configure the thermostat for heat pump operation using Table 2, Step 1.
General| Programmability | 7-day programmable |
|---|---|
| Remote Access | No |
| Energy Monitoring | No |
| Indoor Humidity Control | No |
| Warranty | 1-year limited warranty |
| Power Source | Battery |
| Compatibility | Most HVAC systems |
| Display | LCD |
| Connectivity | No |
| Alerts | Low battery |
Guide to choosing the optimal mounting location for the thermostat.
Step-by-step instructions for mounting the thermostat using a junction box.
Detailed steps for installing the thermostat directly on the wall without a junction box.
Accessing and configuring advanced settings for thermostat operation.
Steps to program daily heating and cooling schedules for optimal comfort.
How the thermostat automatically switches between heating and cooling modes.
Explanation of how the second stage of heating or cooling is activated.
Information on the thermostat's ability to maintain time during power loss.
How to configure and manage fan operation modes (Auto/On).
How to activate and use the emergency heat function for heat pump units.
Configuration and usage guidelines for electric heat applications.
Setting up the thermostat to maintain unoccupied settings for a set period.
Information on using an external sensor to read room temperature.
How to disable or enable the thermostat's keypad buttons.
Using a dry contact switch to force the thermostat into Unoccupied mode.
Guidance on using a power resistor in specific wiring configurations.
How to view outdoor temperature using an optional sensor.
