Carrier thermostat error codes

Carrier 33AW-CS1 thermostat error codes

Fault CodeFault
3Enter water Temperature Thermistor (EWT)
4Actual Refrigerant Temperature Thermistor BPHE
5Outdoor Air Thermistor of GMC
6Loss communication to NUI
7NUI Room Thermistor
8Unit Capacity Mismatch
9Flow Switch error/Water Pump
10EEPROM Corrupt
11OAT high than Stop Heat
12OAT low than Stop Cool
13Loss Communication to RS485 (system configuration type=6)
14Loss of Signal From CDU
15Leaving water Temperature Thermistor (LWT)
17CDU Outdoor Air Thermistor (TO)
18G-Tr short circuit protection
20Position Detection Circuit Error
21Current Sensor Error
22Outdoor Heat Exchange Sensor (TE) / (TS)
23Discharge Temperature Sensor (TD)
24Outdoor Fan Error
26Other Outdoor Error
27Compressor Lock
28Discharge Temperature Error
29Compressor Breakdown
30Low Pressure Switch
31High Pressure Release

Carrier AC thermostat error codes

SYMPTOMWHAT TO CHECK
No LCD on temperature displayCheck for 24vac between R and C at terminal connections. Both R and C must be connected for proper operation.
"E2" on temperature displayBrownout condition or too low of voltage to thermostat. Double check wiring and check for 24vac between R and C. E2 will clear 15 sec after proper voltage is restored.
"E1" on temperature displayTemperature sensor reading out of range. Check sensor for damage. If recycling power does not clear display, thermostat should be replaced.
"Clean Filter" on temperature displayAfter the selected number of hr of blower operation "clean filter" will display on LCD. This is to remind the homeowner to "check" filter. Press "reset filter" button to clear display and reset timer to 0.
on temperature displayIf the outdoor sensor is open, not connected, or shorted "~M will be displayed in place of outdoor temperature.
Cooling will not come onSelect COOL mode. Set desired temperature to 10?F below room temperature. Simultaneously press FAN and INCREASE TEMPERATURE buttons to defeat timers. Check for 24vac at Y (first-stage) terminal. If present, thermostat is OK and problem is with equipment or wiring. If not present, replace thermostat.
Heating will not come onSelect HEAT mode. Set desired temperature to 10DF above room temperature. Simultaneously press FAN and INCREASE TEMPERATURE buttons to defeat timers. Check for 24vac at Y (first-stage) terminal (with heat pump) or W/W1 (with air conditioner) terminal. If present, thermostat is OK and problem is with equipment or wiring. If not present, re- place thermostat.