NOTE: This indicator does not reflect a problem with your system It is displayed when your system is operating on auxiliary heat. The AUX HT indicator appears on the heat pump version of the thermostat only. When this error is present and power is cycled to the thermostat all of the installer configurations, program schedule settings and user settings will be factory default valuesĬarrier 997 Programmable Thermostat Troubleshooting Problem If the thermostat non-volatile memory (EEPROM) has failed, an "E4" error will be shown in the room air temperature display. If the sensor used to sense room Humidity reads less than 0 HR% or greater than 99 HR%, it will be considered as failed and will display "-" If this happens then check the communication cable between NUI and outdoor unit
SMART OPERATION PANEL NOT WORKING CODE
"E3" error code will be displayed and the other functionality will remain same. Under this condition the outside temperature will be blanked. If the NUI does not receive CCN communication data from the CDU for 60 seconds, the display will show"E3" error code in the Temperature display zone and '-'in the Time Display zone. If the sensor used to sense room air temperature, reads less than -45☌ or greater than 65☌, it will be considered as failed and will display "-". Check for 24vac at Y (first-stage) terminal (with heat pump) or W/W1 (with air conditioner) terminal.Ĭarrier 33AWCS1 Thermostat Troubleshooting Simultaneously press FAN and INCREASE TEMPERATURE buttons to defeat timers. Set desired temperature to 10‘F above room temperature. If present, thermostat is OK and problem is with equipment or wiring. Check for 24vac at Y (first-stage) terminal. Set desired temperature to 10'F below room temperature. If the outdoor sensor is open, not connected, or shorted will be displayed in place of outdoor temperature. Press "reset filter" button to clear display and reset timer to 0. This is to remind the homeowner to "check" filter. If recycling power does not clear display, thermostat should be replaced.Īfter the selected number of hr of blower operation "clean filter" will display on LCD. E2 will clear 15 sec after proper voltage is restored. Double check wiring and check for 24vac between R and C. Both R and C must be connected for proper operation.īrownout condition or too low of voltage to thermostat. Some commercial heat pumps require that Heat Pump Option on thermostat is turned OFF.Ĭheck for 24vac between R and C at terminal connections. When controlling a commercial heat pump unit, unit runs in reverse or heating is always on. Configure the thermostat for non-heat pump operation The thermostat is configured for a heat pump. When calling for cooling, both heating and cooling are energized. When controlling a heat pump, heat comes on during cooling cycle.Ĭonfigure thermostat for heat pump operation
Connect a 270 ohm, 10 watt power resistor at the air-conditioning equipment between terminals Y and C (non-heat pump applications only). When using 4 wires (R,G,W,Y), the heating equipment tries repeatedly to turn on, but can- not. Connect a 270 ohm, 10 watt power resistor at the air conditioning equipment between terminals W and C (non-heat pump applications only). When using 4 wires (R,G,W,Y), the cooling equipment tries repeatedly to turn on, but can- not. If 24 vac is not present, replace the thermostat. If present, thermostat is operating correctly and problem is with wiring or equipment. Increase heating set point to 10 degrees above room temperature. Check for Compressor Cycle per Hour Limit. Decrease cooling set point to 10 degrees below room temperature. Terminal R must be connected for proper thermostat operation. Carrier Debonair-33CS Thermostat TroubleshootingĬheck for 24 vac at the R terminal connection. The list of error codes for issue identification is also included. For your convenience, they are present in the form of tables: they enlist the most widespread technical issues and provide detailed instructions for fixing the problems manually or via WiFi connection.
SMART OPERATION PANEL NOT WORKING MANUAL
Below, you can find a troubleshooting manual for some Carrier Thermostat device models.
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