11 models · 332 error codes
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❄️Air Conditioners
ML14XC1 Merit Series 14 SEER Single-Stage Air Conditioner
SOLID GREEN
Normal — Standby
FLASHING GREEN
Normal — Unit Running
1 FLASH YELLOW
High Pressure Switch Open
2 FLASHES YELLOW
Low Pressure Switch Open
3 FLASHES YELLOW
Compressor Thermal Overload
4 FLASHES YELLOW
Short-Cycle Protection
SOLID YELLOW
Low Voltage Warning
SOLID RED
Compressor Lockout
FLASHING RED
Contactor Welded / Stuck
NO LIGHT
No Power to Outdoor Unit
COMPRESSOR FAILURE
Compressor Failure
REFRIGERANT LEAK
Refrigerant Leak
CAPACITOR FAILURE
Capacitor Failure (Run/Start)
CONTACTOR FAILURE
Contactor Failure
FROZEN EVAPORATOR
Frozen Evaporator Coil
DIRTY CONDENSER
Dirty Condenser Coil
CONDENSER FAN FAIL
Condenser Fan Motor Failure
TXV FAILURE
TXV / Metering Device Failure
XC21 Dave Lennox Signature Collection 21 SEER Variable-Capacity Air Conditioner
ALERT 1
Communication Loss — Outdoor Unit
ALERT 2
Communication Loss — Indoor Unit
ALERT 11
High Pressure Protection — Outdoor Unit
ALERT 12
Low Pressure Protection — Outdoor Unit
ALERT 14
Compressor Discharge Temperature High
ALERT 21
Compressor Lockout
ALERT 22
Compressor Short-Cycle Protection Active
ALERT 41
Outdoor Fan Motor Fault
ALERT 42
Outdoor Fan Overcurrent
ALERT 46
Indoor Blower Not Running
ALERT 51
Indoor Coil Freeze Protection
ALERT 61
Low Voltage Detected
ALERT 71
Outdoor Ambient Temperature Sensor Fault
ALERT 72
Indoor Coil Temperature Sensor Fault
ALERT 73
Outdoor Coil Temperature Sensor Fault
ALERT 74
Suction Line Temperature Sensor Fault
ALERT 75
Liquid Line Temperature Sensor Fault
ALERT 81
High Limit Switch Open — Furnace
ALERT 82
Flame Rollout Switch Open — Furnace
ALERT 86
Ignition Failure — Furnace
ALERT 87
Gas Valve Fault — Furnace
SOLID GREEN
Normal — Standby
FLASHING GREEN
Normal — Unit Running
1 FLASH YELLOW
High Pressure Switch Open
2 FLASHES YELLOW
Low Pressure Switch Open
3 FLASHES YELLOW
Compressor Thermal Overload
4 FLASHES YELLOW
Short-Cycle Protection
SOLID YELLOW
Low Voltage Warning
SOLID RED
Compressor Lockout
FLASHING RED
Contactor Welded / Stuck
NO LIGHT
No Power to Outdoor Unit
COMPRESSOR FAILURE
Compressor Failure
REFRIGERANT LEAK
Refrigerant Leak
CAPACITOR FAILURE
Capacitor Failure (Run/Start)
CONTACTOR FAILURE
Contactor Failure
FROZEN EVAPORATOR
Frozen Evaporator Coil
DIRTY CONDENSER
Dirty Condenser Coil
CONDENSER FAN FAIL
Condenser Fan Motor Failure
TXV FAILURE
TXV / Metering Device Failure
XC25 Dave Lennox Signature Collection 26 SEER Variable-Capacity Air Conditioner
ALERT 1
Communication Loss — Outdoor Unit
ALERT 2
Communication Loss — Indoor Unit
ALERT 11
High Pressure Protection — Outdoor Unit
ALERT 12
Low Pressure Protection — Outdoor Unit
ALERT 14
Compressor Discharge Temperature High
ALERT 21
Compressor Lockout
ALERT 22
Compressor Short-Cycle Protection Active
ALERT 41
Outdoor Fan Motor Fault
ALERT 42
Outdoor Fan Overcurrent
ALERT 46
Indoor Blower Not Running
ALERT 51
Indoor Coil Freeze Protection
ALERT 61
Low Voltage Detected
ALERT 71
Outdoor Ambient Temperature Sensor Fault
ALERT 72
Indoor Coil Temperature Sensor Fault
ALERT 73
Outdoor Coil Temperature Sensor Fault
ALERT 74
Suction Line Temperature Sensor Fault
ALERT 75
Liquid Line Temperature Sensor Fault
ALERT 81
High Limit Switch Open — Furnace
ALERT 82
Flame Rollout Switch Open — Furnace
ALERT 86
Ignition Failure — Furnace
ALERT 87
Gas Valve Fault — Furnace
SOLID GREEN
Normal — Standby
FLASHING GREEN
Normal — Unit Running
1 FLASH YELLOW
High Pressure Switch Open
2 FLASHES YELLOW
Low Pressure Switch Open
3 FLASHES YELLOW
Compressor Thermal Overload
4 FLASHES YELLOW
Short-Cycle Protection
SOLID YELLOW
Low Voltage Warning
SOLID RED
Compressor Lockout
FLASHING RED
Contactor Welded / Stuck
NO LIGHT
No Power to Outdoor Unit
COMPRESSOR FAILURE
Compressor Failure
REFRIGERANT LEAK
Refrigerant Leak
CAPACITOR FAILURE
Capacitor Failure (Run/Start)
CONTACTOR FAILURE
Contactor Failure
FROZEN EVAPORATOR
Frozen Evaporator Coil
DIRTY CONDENSER
Dirty Condenser Coil
CONDENSER FAN FAIL
Condenser Fan Motor Failure
TXV FAILURE
TXV / Metering Device Failure
🔧air_handlers
CBX27UH Lennox Variable Speed Air Handler
SOLID GREEN
Normal — Standby
FLASHING GREEN
Normal — Blower Running
SOLID YELLOW
Blower Motor Fault
FLASHING YELLOW
High Limit — Electric Heat
SOLID RED
Control Board Fault
NO LIGHT
No Power
AH BLOWER MOTOR FAIL
Blower Motor Failure
SEQUENCER FAILURE
Electric Heat Strip Sequencer Failure
DRAIN PAN OVERFLOW
Condensate Drain Pan Overflow
EVAPORATOR COIL DIRTY
Indoor Coil Dirty / Restricted
🔥Furnaces
EL296V Elite Series 96% AFUE Two-Stage Variable Speed Gas Furnace
STEADY ON
Normal Operation / Standby
NO LIGHT
No Power to Control Board
RAPID FLASH
Flame Signal Marginal
1 FLASH
No Previous Fault Code Stored
2 FLASHES
System Lockout — Retries Exhausted
3 FLASHES
Pressure Switch Stuck Closed
4 FLASHES
Pressure Switch Open — Did Not Close
5 FLASHES
Flame Sensed Without Call for Heat
6 FLASHES
115 VAC Power or Ground Fault
7 FLASHES
Limit Circuit Lockout — Limit or Flame Rollout Switch Open
8 FLASHES
Ignition Failure — No Flame Sensed
9 FLASHES
High-Stage Pressure Switch Did Not Close
10 FLASHES
Blower Motor Calibration Fault
11 FLASHES
Auxiliary Limit Switch Open
12 FLASHES
Inducer Motor Fault
13 FLASHES
Communicating System Fault
CONTINUOUS ON
Control Board Failure
ALTERNATING
Reversed Polarity on Gas Valve
CRACKED HEAT EXCHANGER
Cracked Heat Exchanger
IGNITER FAILURE
Hot Surface Igniter Failure
INDUCER MOTOR FAIL
Inducer Motor Failure
BLOWER MOTOR FAIL
Blower Motor Failure (ECM/Variable Speed)
FLAME SENSOR DIRTY
Flame Sensor Fouled / Failed
GAS VALVE FAIL
Gas Valve Failure
CONDENSATE DRAIN CLOG
Condensate Drain Clogged (90%+ AFUE)
NOISY BLOWER WHEEL
Noisy Blower Wheel / Vibration
PILOT LIGHT ISSUES
Thermocouple / Pilot Light Issues (Older Units)
CONTROL BOARD FAIL
Control Board Failure
ML196E Merit Series 96% AFUE Single-Stage Gas Furnace
STEADY ON
Normal Operation / Standby
NO LIGHT
No Power to Control Board
RAPID FLASH
Flame Signal Marginal
1 FLASH
No Previous Fault Code Stored
2 FLASHES
System Lockout — Retries Exhausted
3 FLASHES
Pressure Switch Stuck Closed
4 FLASHES
Pressure Switch Open — Did Not Close
5 FLASHES
Flame Sensed Without Call for Heat
6 FLASHES
115 VAC Power or Ground Fault
7 FLASHES
Limit Circuit Lockout — Limit or Flame Rollout Switch Open
8 FLASHES
Ignition Failure — No Flame Sensed
10 FLASHES
Blower Motor Calibration Fault
11 FLASHES
Auxiliary Limit Switch Open
12 FLASHES
Inducer Motor Fault
13 FLASHES
Communicating System Fault
CONTINUOUS ON
Control Board Failure
ALTERNATING
Reversed Polarity on Gas Valve
CRACKED HEAT EXCHANGER
Cracked Heat Exchanger
IGNITER FAILURE
Hot Surface Igniter Failure
INDUCER MOTOR FAIL
Inducer Motor Failure
BLOWER MOTOR FAIL
Blower Motor Failure (ECM/Variable Speed)
FLAME SENSOR DIRTY
Flame Sensor Fouled / Failed
GAS VALVE FAIL
Gas Valve Failure
CONDENSATE DRAIN CLOG
Condensate Drain Clogged (90%+ AFUE)
NOISY BLOWER WHEEL
Noisy Blower Wheel / Vibration
PILOT LIGHT ISSUES
Thermocouple / Pilot Light Issues (Older Units)
CONTROL BOARD FAIL
Control Board Failure
SL280V Dave Lennox Signature Collection 80% AFUE Variable Speed Gas Furnace
STEADY ON
Normal Operation / Standby
NO LIGHT
No Power to Control Board
RAPID FLASH
Flame Signal Marginal
1 FLASH
No Previous Fault Code Stored
2 FLASHES
System Lockout — Retries Exhausted
3 FLASHES
Pressure Switch Stuck Closed
4 FLASHES
Pressure Switch Open — Did Not Close
5 FLASHES
Flame Sensed Without Call for Heat
6 FLASHES
115 VAC Power or Ground Fault
7 FLASHES
Limit Circuit Lockout — Limit or Flame Rollout Switch Open
8 FLASHES
Ignition Failure — No Flame Sensed
9 FLASHES
High-Stage Pressure Switch Did Not Close
10 FLASHES
Blower Motor Calibration Fault
11 FLASHES
Auxiliary Limit Switch Open
12 FLASHES
Inducer Motor Fault
13 FLASHES
Communicating System Fault
CONTINUOUS ON
Control Board Failure
ALTERNATING
Reversed Polarity on Gas Valve
CRACKED HEAT EXCHANGER
Cracked Heat Exchanger
IGNITER FAILURE
Hot Surface Igniter Failure
INDUCER MOTOR FAIL
Inducer Motor Failure
BLOWER MOTOR FAIL
Blower Motor Failure (ECM/Variable Speed)
FLAME SENSOR DIRTY
Flame Sensor Fouled / Failed
GAS VALVE FAIL
Gas Valve Failure
NOISY BLOWER WHEEL
Noisy Blower Wheel / Vibration
PILOT LIGHT ISSUES
Thermocouple / Pilot Light Issues (Older Units)
CONTROL BOARD FAIL
Control Board Failure
SL297NV Dave Lennox Signature Collection 97% AFUE Modulating Variable Speed Gas Furnace
STEADY ON
Normal Operation / Standby
NO LIGHT
No Power to Control Board
RAPID FLASH
Flame Signal Marginal
1 FLASH
No Previous Fault Code Stored
2 FLASHES
System Lockout — Retries Exhausted
3 FLASHES
Pressure Switch Stuck Closed
4 FLASHES
Pressure Switch Open — Did Not Close
5 FLASHES
Flame Sensed Without Call for Heat
6 FLASHES
115 VAC Power or Ground Fault
7 FLASHES
Limit Circuit Lockout — Limit or Flame Rollout Switch Open
8 FLASHES
Ignition Failure — No Flame Sensed
9 FLASHES
High-Stage Pressure Switch Did Not Close
10 FLASHES
Blower Motor Calibration Fault
11 FLASHES
Auxiliary Limit Switch Open
12 FLASHES
Inducer Motor Fault
13 FLASHES
Communicating System Fault
CONTINUOUS ON
Control Board Failure
ALTERNATING
Reversed Polarity on Gas Valve
CRACKED HEAT EXCHANGER
Cracked Heat Exchanger
IGNITER FAILURE
Hot Surface Igniter Failure
INDUCER MOTOR FAIL
Inducer Motor Failure
BLOWER MOTOR FAIL
Blower Motor Failure (ECM/Variable Speed)
FLAME SENSOR DIRTY
Flame Sensor Fouled / Failed
GAS VALVE FAIL
Gas Valve Failure
CONDENSATE DRAIN CLOG
Condensate Drain Clogged (90%+ AFUE)
NOISY BLOWER WHEEL
Noisy Blower Wheel / Vibration
PILOT LIGHT ISSUES
Thermocouple / Pilot Light Issues (Older Units)
CONTROL BOARD FAIL
Control Board Failure
🌡️Heat Pumps
XP21 Dave Lennox Signature Collection 20 SEER Heat Pump
ALERT 1
Communication Loss — Outdoor Unit
ALERT 2
Communication Loss — Indoor Unit
ALERT 11
High Pressure Protection — Outdoor Unit
ALERT 12
Low Pressure Protection — Outdoor Unit
ALERT 14
Compressor Discharge Temperature High
ALERT 21
Compressor Lockout
ALERT 22
Compressor Short-Cycle Protection Active
ALERT 41
Outdoor Fan Motor Fault
ALERT 42
Outdoor Fan Overcurrent
ALERT 46
Indoor Blower Not Running
ALERT 51
Indoor Coil Freeze Protection
ALERT 61
Low Voltage Detected
ALERT 71
Outdoor Ambient Temperature Sensor Fault
ALERT 72
Indoor Coil Temperature Sensor Fault
ALERT 73
Outdoor Coil Temperature Sensor Fault
ALERT 74
Suction Line Temperature Sensor Fault
ALERT 75
Liquid Line Temperature Sensor Fault
ALERT 81
High Limit Switch Open — Furnace
ALERT 82
Flame Rollout Switch Open — Furnace
ALERT 86
Ignition Failure — Furnace
ALERT 87
Gas Valve Fault — Furnace
SOLID GREEN
Normal — Standby
FLASHING GREEN
Normal — Unit Running
1 FLASH YELLOW
High Pressure Switch Open
2 FLASHES YELLOW
Low Pressure Switch Open
3 FLASHES YELLOW
Compressor Thermal Overload
4 FLASHES YELLOW
Short-Cycle Protection
SOLID YELLOW
Low Voltage Warning
SOLID RED
Compressor Lockout
FLASHING RED
Contactor Welded / Stuck
NO LIGHT
No Power to Outdoor Unit
ALERT 31
Reversing Valve Fault
ALERT 32
Defrost Cycle Failure
ALERT 33
Outdoor Coil Temperature Too Low
ALERT 34
Auxiliary / Emergency Heat Active
COMPRESSOR FAILURE
Compressor Failure
REFRIGERANT LEAK
Refrigerant Leak
CAPACITOR FAILURE
Capacitor Failure (Run/Start)
CONTACTOR FAILURE
Contactor Failure
FROZEN EVAPORATOR
Frozen Evaporator Coil
DIRTY CONDENSER
Dirty Condenser Coil
CONDENSER FAN FAIL
Condenser Fan Motor Failure
TXV FAILURE
TXV / Metering Device Failure
REVERSING VALVE STUCK
Reversing Valve Stuck or Leaking
DEFROST MALFUNCTION
Defrost System Malfunction
HEAT STRIP FAIL
Supplemental Heat Strip Failure
OUTDOOR ICE MILD
Outdoor Unit Icing in Mild Weather
XP25 Dave Lennox Signature Collection Variable-Capacity Heat Pump
ALERT 1
Communication Loss — Outdoor Unit
ALERT 2
Communication Loss — Indoor Unit
ALERT 11
High Pressure Protection — Outdoor Unit
ALERT 12
Low Pressure Protection — Outdoor Unit
ALERT 14
Compressor Discharge Temperature High
ALERT 21
Compressor Lockout
ALERT 22
Compressor Short-Cycle Protection Active
ALERT 41
Outdoor Fan Motor Fault
ALERT 42
Outdoor Fan Overcurrent
ALERT 46
Indoor Blower Not Running
ALERT 51
Indoor Coil Freeze Protection
ALERT 61
Low Voltage Detected
ALERT 71
Outdoor Ambient Temperature Sensor Fault
ALERT 72
Indoor Coil Temperature Sensor Fault
ALERT 73
Outdoor Coil Temperature Sensor Fault
ALERT 74
Suction Line Temperature Sensor Fault
ALERT 75
Liquid Line Temperature Sensor Fault
ALERT 81
High Limit Switch Open — Furnace
ALERT 82
Flame Rollout Switch Open — Furnace
ALERT 86
Ignition Failure — Furnace
ALERT 87
Gas Valve Fault — Furnace
SOLID GREEN
Normal — Standby
FLASHING GREEN
Normal — Unit Running
1 FLASH YELLOW
High Pressure Switch Open
2 FLASHES YELLOW
Low Pressure Switch Open
3 FLASHES YELLOW
Compressor Thermal Overload
4 FLASHES YELLOW
Short-Cycle Protection
SOLID YELLOW
Low Voltage Warning
SOLID RED
Compressor Lockout
FLASHING RED
Contactor Welded / Stuck
NO LIGHT
No Power to Outdoor Unit
ALERT 31
Reversing Valve Fault
ALERT 32
Defrost Cycle Failure
ALERT 33
Outdoor Coil Temperature Too Low
ALERT 34
Auxiliary / Emergency Heat Active
COMPRESSOR FAILURE
Compressor Failure
REFRIGERANT LEAK
Refrigerant Leak
CAPACITOR FAILURE
Capacitor Failure (Run/Start)
CONTACTOR FAILURE
Contactor Failure
FROZEN EVAPORATOR
Frozen Evaporator Coil
DIRTY CONDENSER
Dirty Condenser Coil
CONDENSER FAN FAIL
Condenser Fan Motor Failure
TXV FAILURE
TXV / Metering Device Failure
REVERSING VALVE STUCK
Reversing Valve Stuck or Leaking
DEFROST MALFUNCTION
Defrost System Malfunction
HEAT STRIP FAIL
Supplemental Heat Strip Failure
OUTDOOR ICE MILD
Outdoor Unit Icing in Mild Weather
❄️Mini Splits
MPA012S4S Lennox Mini-Split Heat Pump System 12,000 BTU
E1
Compressor High Pressure Protection
E2
Indoor Coil Anti-Freeze Protection
E3
Compressor Low Pressure Protection
E4
Compressor Discharge Temperature Protection
E5
Compressor Overcurrent Protection
E6
Communication Error — Indoor/Outdoor
E8
Indoor Fan Motor Fault
F1
Indoor Ambient Temperature Sensor Fault
F2
Indoor Coil Temperature Sensor Fault
F3
Outdoor Ambient Temperature Sensor Fault
F4
Outdoor Coil Temperature Sensor Fault
F5
Compressor Discharge Temperature Sensor Fault
H1
Defrost Mode Active
H6
IPM / Inverter Module Protection
P0
EEPROM Data Error
P1
Input Voltage Protection
CONDENSATE DRAIN BLOCK
Condensate Drain Blockage / Water Leak
INDOOR UNIT ODOR
Indoor Unit Odor / Mold
LINE SET LEAK
Refrigerant Leak at Line Set Connections
OUTDOOR FAN FAIL
Outdoor Unit Fan Motor Failure
INVERTER BOARD FAIL
Inverter Board Failure
REMOTE CONTROL FAIL
Wireless Remote Control Malfunction
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Replace ADSENSE_PUBLISHER_ID in AdUnit.tsx