MECH-CAPACITOR

Run Capacitor Failure — AC Hums But Won't Start, or Shuts Off

MECH-CONTACTOR

Contactor Failure — AC Won't Turn On or Won't Turn Off

MECH-CONDENSER-COIL

Condenser Coil Fouling — Reduced Cooling and High Pressure

MECH-FAN-MOTOR

Condenser Fan Motor Failure — Outdoor Fan Not Spinning

MECH-COMPRESSOR

Compressor Failure — No Cooling, Loud Noises, or Tripping Breaker

MECH-REFRIGERANT

Refrigerant Leak — Gradually Reduced Cooling Performance

MECH-TXV

Thermostatic Expansion Valve (TXV) Failure — Poor Cooling or Freezing

MECH-HARD-START

Compressor Hard Start — Breaker Trips or Sluggish Startup

MECH-FAN-BLADE

Condenser Fan Blade Issues — Vibration and Noise

MECH-WIRING

Electrical Connection Issues — Intermittent Operation or No Power

CODE-12

Infinity Code 12 — No Cooling / Call Not Satisfied

CODE-31

Infinity Code 31 — High-Pressure Protection

CODE-32

Infinity Code 32 — Low-Pressure Protection

CODE-33

Infinity Code 33 — Outdoor Coil Thermistor Open/Short

CODE-34

Infinity Code 34 — Indoor Coil Thermistor Issue

CODE-51

Infinity Code 51 — Over/Under Charge Protection

CODE-52

Infinity Code 52 — Outdoor Unit Lost Communication

CODE-53

Infinity Code 53 — Indoor Unit Lost Communication

CODE-61

Infinity Code 61 — Compressor Protection (Low Speed)

CODE-62

Infinity Code 62 — Compressor Protection (High Speed)

CODE-63

Infinity Code 63 — Outdoor Fan Fault

CODE-76

Infinity Code 76 — Refrigerant Charge Protection

MECH-CONDENSER-COIL

Condenser Coil Fouling — Reduced Efficiency and Protection Faults

MECH-REFRIGERANT

Refrigerant Leak — Gradual Capacity Loss and Protection Faults

MECH-INVERTER

Inverter Drive Board Failure — Compressor Won't Modulate

MECH-FAN-MOTOR

Outdoor Fan Motor Failure — Fan Not Spinning or Noisy

MECH-WIRING

Communication/Wiring Issues — Intermittent Faults and Codes 52/53

MECH-CAPACITOR

Run Capacitor Failure — AC Hums But Won't Start, or Shuts Off

MECH-CONTACTOR

Contactor Failure — AC Won't Turn On or Won't Turn Off

MECH-CONDENSER-COIL

Condenser Coil Fouling — Reduced Cooling and High Pressure

MECH-FAN-MOTOR

Condenser Fan Motor Failure — Outdoor Fan Not Spinning

MECH-COMPRESSOR

Compressor Failure — No Cooling, Loud Noises, or Tripping Breaker

MECH-REFRIGERANT

Refrigerant Leak — Gradually Reduced Cooling Performance

MECH-TXV

Thermostatic Expansion Valve (TXV) Failure — Poor Cooling or Freezing

MECH-HARD-START

Compressor Hard Start — Breaker Trips or Sluggish Startup

MECH-FAN-BLADE

Condenser Fan Blade Issues — Vibration and Noise

MECH-WIRING

Electrical Connection Issues — Intermittent Operation or No Power

MECH-CAPACITOR

Run Capacitor Failure — AC Hums But Won't Start, or Shuts Off

MECH-CONTACTOR

Contactor Failure — AC Won't Turn On or Won't Turn Off

MECH-CONDENSER-COIL

Condenser Coil Fouling — Reduced Cooling and High Pressure

MECH-FAN-MOTOR

Condenser Fan Motor Failure — Outdoor Fan Not Spinning

MECH-COMPRESSOR

Compressor Failure — No Cooling, Loud Noises, or Tripping Breaker

MECH-REFRIGERANT

Refrigerant Leak — Gradually Reduced Cooling Performance

MECH-TXV

Thermostatic Expansion Valve (TXV) Failure — Poor Cooling or Freezing

MECH-HARD-START

Compressor Hard Start — Breaker Trips or Sluggish Startup

MECH-FAN-BLADE

Condenser Fan Blade Issues — Vibration and Noise

MECH-WIRING

Electrical Connection Issues — Intermittent Operation or No Power

BLINK-1

LED 1 Blink — System Lockout (Retries Exceeded)

BLINK-2

LED 2 Blinks — Pressure Switch Stuck Closed

BLINK-3

LED 3 Blinks — Pressure Switch Did Not Close (Draft Safeguard)

BLINK-4

LED 4 Blinks — Open High-Limit Switch (Overheating)

BLINK-5

LED 5 Blinks — Flame Sensed Without Gas Valve Call (Dangerous)

BLINK-6

LED 6 Blinks — 115V Power Reversed or Neutral Not Grounded

BLINK-7

LED 7 Blinks — Gas Valve Circuit Failure

BLINK-8

LED 8 Blinks — Ignitor Circuit Fault / Low Flame Signal

BLINK-9

LED 9 Blinks — Check Grounding / Reversed Polarity

MECH-FLAME-SENSOR

Dirty Flame Sensor Rod — Furnace Lights Then Shuts Off

MECH-IGNITOR

Hot Surface Ignitor Failure — Furnace Won't Ignite

MECH-FILTER

Dirty/Restricted Air Filter — Overheating and Short Cycling

MECH-INDUCER

Draft Inducer Motor Failure — Furnace Won't Start

MECH-BLOWER

Blower Motor Failure — No Airflow from Vents

MECH-GAS-VALVE

Gas Valve Sticking — Intermittent Ignition Failure

MECH-HEAT-EXCHANGER

Heat Exchanger Cracks — Potential Carbon Monoxide Risk

BLINK-1

LED 1 Blink — System Lockout (Retries Exceeded)

BLINK-2

LED 2 Blinks — Pressure Switch Stuck Closed

BLINK-3

LED 3 Blinks — Pressure Switch Did Not Close (Draft Safeguard)

BLINK-4

LED 4 Blinks — Open High-Limit Switch (Overheating)

BLINK-5

LED 5 Blinks — Flame Sensed Without Gas Valve Call (Dangerous)

BLINK-6

LED 6 Blinks — 115V Power Reversed or Neutral Not Grounded

BLINK-7

LED 7 Blinks — Gas Valve Circuit Failure

BLINK-8

LED 8 Blinks — Ignitor Circuit Fault / Low Flame Signal

BLINK-9

LED 9 Blinks — Check Grounding / Reversed Polarity

MECH-FLAME-SENSOR

Dirty Flame Sensor Rod — Furnace Lights Then Shuts Off

MECH-IGNITOR

Hot Surface Ignitor Failure — Furnace Won't Ignite

MECH-FILTER

Dirty/Restricted Air Filter — Overheating and Short Cycling

MECH-INDUCER

Draft Inducer Motor Failure — Furnace Won't Start

MECH-BLOWER

Blower Motor Failure — No Airflow from Vents

MECH-GAS-VALVE

Gas Valve Sticking — Intermittent Ignition Failure

MECH-HEAT-EXCHANGER

Heat Exchanger Cracks — Potential Carbon Monoxide Risk

BLINK-1

LED 1 Blink — System Lockout (Retries Exceeded)

BLINK-2

LED 2 Blinks — Pressure Switch Stuck Closed

BLINK-3

LED 3 Blinks — Pressure Switch Did Not Close (Draft Safeguard)

BLINK-4

LED 4 Blinks — Open High-Limit Switch (Overheating)

BLINK-5

LED 5 Blinks — Flame Sensed Without Gas Valve Call (Dangerous)

BLINK-6

LED 6 Blinks — 115V Power Reversed or Neutral Not Grounded

BLINK-7

LED 7 Blinks — Gas Valve Circuit Failure

BLINK-8

LED 8 Blinks — Ignitor Circuit Fault / Low Flame Signal

BLINK-9

LED 9 Blinks — Check Grounding / Reversed Polarity

MECH-FLAME-SENSOR

Dirty Flame Sensor Rod — Furnace Lights Then Shuts Off

MECH-IGNITOR

Hot Surface Ignitor Failure — Furnace Won't Ignite

MECH-FILTER

Dirty/Restricted Air Filter — Overheating and Short Cycling

MECH-INDUCER

Draft Inducer Motor Failure — Furnace Won't Start

MECH-BLOWER

Blower Motor Failure — No Airflow from Vents

MECH-GAS-VALVE

Gas Valve Sticking — Intermittent Ignition Failure

MECH-HEAT-EXCHANGER

Heat Exchanger Cracks — Potential Carbon Monoxide Risk

CODE-21

Infinity Code 21 — Gas Heating Lockout

CODE-22

Infinity Code 22 — Abnormal Flame-Proving Signal

CODE-23

Infinity Code 23 — Pressure Switch Fault

CODE-24

Infinity Code 24 — Secondary Voltage Fuse Blown

CODE-26

Infinity Code 26 — Line Voltage Limit Circuit Open

CODE-41

Infinity Code 41 — Blower Motor Fault

CODE-42

Infinity Code 42 — Inducer Motor Fault

CODE-43

Infinity Code 43 — Low Flame Signal / Dirty Flame Sensor

CODE-44

Infinity Code 44 — Blower Calibration Fault

CODE-45

Infinity Code 45 — Control Circuit Lockout

CODE-46

Infinity Code 46 — Low Line Voltage

CODE-47

Infinity Code 47 — High Line Voltage

MECH-FLAME-SENSOR

Dirty Flame Sensor Rod — Furnace Lights Then Shuts Off

MECH-IGNITOR

Hot Surface Ignitor Failure — Furnace Won't Ignite

MECH-FILTER

Dirty/Restricted Air Filter — Overheating and Short Cycling

MECH-INDUCER

Draft Inducer Motor Failure — Furnace Won't Start

MECH-BLOWER

Blower Motor Failure — No Airflow from Vents

MECH-CONDENSATE

Condensate Drain Blockage — Water Backup / Pressure Switch Failure

CODE-21

Infinity Code 21 — Gas Heating Lockout

CODE-22

Infinity Code 22 — Abnormal Flame-Proving Signal

CODE-23

Infinity Code 23 — Pressure Switch Fault

CODE-24

Infinity Code 24 — Secondary Voltage Fuse Blown

CODE-26

Infinity Code 26 — Line Voltage Limit Circuit Open

CODE-41

Infinity Code 41 — Blower Motor Fault

CODE-42

Infinity Code 42 — Inducer Motor Fault

CODE-43

Infinity Code 43 — Low Flame Signal / Dirty Flame Sensor

CODE-44

Infinity Code 44 — Blower Calibration Fault

CODE-45

Infinity Code 45 — Control Circuit Lockout

CODE-46

Infinity Code 46 — Low Line Voltage

CODE-47

Infinity Code 47 — High Line Voltage

MECH-FLAME-SENSOR

Dirty Flame Sensor Rod — Furnace Lights Then Shuts Off

MECH-IGNITOR

Hot Surface Ignitor Failure — Furnace Won't Ignite

MECH-FILTER

Dirty/Restricted Air Filter — Overheating and Short Cycling

MECH-INDUCER

Draft Inducer Motor Failure — Furnace Won't Start

MECH-BLOWER

Blower Motor Failure — No Airflow from Vents

MECH-CONDENSATE

Condensate Drain Blockage — Water Backup / Pressure Switch Failure

BLINK-1

LED 1 Blink — System Lockout (Retries Exceeded)

BLINK-2

LED 2 Blinks — Pressure Switch Stuck Closed

BLINK-3

LED 3 Blinks — Pressure Switch Did Not Close (Draft Safeguard)

BLINK-4

LED 4 Blinks — Open High-Limit Switch (Overheating)

BLINK-5

LED 5 Blinks — Flame Sensed Without Gas Valve Call (Dangerous)

BLINK-6

LED 6 Blinks — 115V Power Reversed or Neutral Not Grounded

BLINK-7

LED 7 Blinks — Gas Valve Circuit Failure

BLINK-8

LED 8 Blinks — Ignitor Circuit Fault / Low Flame Signal

BLINK-9

LED 9 Blinks — Check Grounding / Reversed Polarity

BLINK-10

LED 10 Blinks — Secondary Limit Switch Open (Condensing)

RAPID-FLASH

LED Rapid Flashing — Flame Signal Below Threshold

MECH-FLAME-SENSOR

Dirty Flame Sensor Rod — Furnace Lights Then Shuts Off

MECH-IGNITOR

Hot Surface Ignitor Failure — Furnace Won't Ignite

MECH-FILTER

Dirty/Restricted Air Filter — Overheating and Short Cycling

MECH-INDUCER

Draft Inducer Motor Failure — Furnace Won't Start

MECH-BLOWER

Blower Motor Failure — No Airflow from Vents

MECH-GAS-VALVE

Gas Valve Sticking — Intermittent Ignition Failure

MECH-HEAT-EXCHANGER

Heat Exchanger Cracks — Potential Carbon Monoxide Risk

MECH-CONDENSATE

Condensate Drain Blockage — Water Backup / Pressure Switch Failure

CODE-11

Infinity Code 11 — No Heat / Heating Call Not Satisfied

CODE-12

Infinity Code 12 — No Cooling / Call Not Satisfied

CODE-31

Infinity Code 31 — High-Pressure Protection

CODE-32

Infinity Code 32 — Low-Pressure Protection

CODE-33

Infinity Code 33 — Outdoor Coil Thermistor Open/Short

CODE-34

Infinity Code 34 — Indoor Coil Thermistor Issue

CODE-51

Infinity Code 51 — Over/Under Charge Protection

CODE-52

Infinity Code 52 — Outdoor Unit Lost Communication

CODE-53

Infinity Code 53 — Indoor Unit Lost Communication

CODE-61

Infinity Code 61 — Compressor Protection (Low Speed)

CODE-62

Infinity Code 62 — Compressor Protection (High Speed)

CODE-63

Infinity Code 63 — Outdoor Fan Fault

CODE-76

Infinity Code 76 — Refrigerant Charge Protection

MECH-DEFROST

Defrost Cycle Issues — Outdoor Coil Iced Over in Winter

MECH-REVERSING-VALVE

Reversing Valve Stuck — System Heats When Should Cool or Vice Versa

MECH-CONDENSER-COIL

Condenser Coil Fouling — Reduced Efficiency and Protection Faults

MECH-REFRIGERANT

Refrigerant Leak — Gradual Capacity Loss and Protection Faults

MECH-INVERTER

Inverter Drive Board Failure — Compressor Won't Modulate

MECH-FAN-MOTOR

Outdoor Fan Motor Failure — Fan Not Spinning or Noisy

MECH-WIRING

Communication/Wiring Issues — Intermittent Faults and Codes 52/53