What causes a heat pump icing over?

A heat pump icing over can be caused by ice, frost, defrost, frozen issues. We track 100 error codes across 1 brands related to this symptom.

How do I fix a heat pump icing over?

There are 200 community-ranked fixes for this symptom across 1 brands. The average fix success rate is 89%. Find your specific error code below for step-by-step instructions.

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Heat Pump Icing Over

Outdoor unit covered in ice? Find error codes for defrost control board, reversing valve, low refrigerant, and fan motor issues.

100

Error Codes

Brands

200

DIY Fixes

89%

Avg Success

Mitsubishi

100 codes

All Mitsubishi codes

Centralized Controller Address Error

🌡️ MXZ-4C36NAHZ 36,000 BTU 4-Zone Hyper-Heat Multi-Zone Outdoor Unit· 2 fixes· 90% success

Inspect and Reconfigure M-NET Network Wiring and Devices

Initial Startup Not Completed

🌡️ MXZ-4C36NAHZ 36,000 BTU 4-Zone Hyper-Heat Multi-Zone Outdoor Unit· 2 fixes· 90% success

Perform Full Commissioning and Firmware Verification

Address / Combination Setting Error

🌡️ MXZ-4C36NAHZ 36,000 BTU 4-Zone Hyper-Heat Multi-Zone Outdoor Unit· 2 fixes· 85% success

Replace Faulty Address Setting Switches or Control Board

Outdoor-to-Outdoor Communication Error

🌡️ MXZ-4C36NAHZ 36,000 BTU 4-Zone Hyper-Heat Multi-Zone Outdoor Unit· 2 fixes· 90% success

Verify Address Settings and Replace Faulty Communication Bus Components

Indoor-to-Outdoor Serial Communication Error

🌡️ MXZ-4C36NAHZ 36,000 BTU 4-Zone Hyper-Heat Multi-Zone Outdoor Unit· 2 fixes· 90% success

Test and Repair Signal Wiring Harness or Replace Control Board

Indoor/Outdoor Unit Communication Error

🌡️ MXZ-4C36NAHZ 36,000 BTU 4-Zone Hyper-Heat Multi-Zone Outdoor Unit· 2 fixes· 88% success

Test Communication Signal and Replace Damaged Signal Wire or Outdoor PCB

Inter-Outdoor-Unit Transmission Error

🌡️ MXZ-4C36NAHZ 36,000 BTU 4-Zone Hyper-Heat Multi-Zone Outdoor Unit· 2 fixes· 85% success

Test and Replace Damaged Inter-Unit Communication Wiring or Connectors

Outdoor Unit EEPROM / Address Error

🌡️ MXZ-4C36NAHZ 36,000 BTU 4-Zone Hyper-Heat Multi-Zone Outdoor Unit· 2 fixes· 90% success

Replace or Reflash Outdoor Unit PCB to Fix EEPROM Corruption

Low Pressure Protection / Low Refrigerant

🌡️ MXZ-4C36NAHZ 36,000 BTU 4-Zone Hyper-Heat Multi-Zone Outdoor Unit· 2 fixes· 90% success

Locate and Repair Refrigerant Leak, Evacuate, and Recharge System

Power Transistor (IGBT) Abnormality

🌡️ MXZ-4C36NAHZ 36,000 BTU 4-Zone Hyper-Heat Multi-Zone Outdoor Unit· 2 fixes· 90% success

Replace the Outdoor Unit Inverter Board (IPM Module)

Electrical Compartment Temperature Too High

🌡️ MXZ-4C36NAHZ 36,000 BTU 4-Zone Hyper-Heat Multi-Zone Outdoor Unit· 2 fixes· 90% success

Replace Electrical Compartment Temperature Sensor and Inspect Wiring

Outdoor Unit Main PCB Error

🌡️ MXZ-4C36NAHZ 36,000 BTU 4-Zone Hyper-Heat Multi-Zone Outdoor Unit· 2 fixes· 90% success

Replace the Outdoor Unit Main PCB Assembly

Outdoor Fan Motor Error

🌡️ MXZ-4C36NAHZ 36,000 BTU 4-Zone Hyper-Heat Multi-Zone Outdoor Unit· 2 fixes· 85% success

Test and Replace the Outdoor Fan Motor and Capacitor if Needed

Outdoor PCB EEPROM Error

🌡️ MXZ-4C36NAHZ 36,000 BTU 4-Zone Hyper-Heat Multi-Zone Outdoor Unit· 2 fixes· 90% success

Replace the Outdoor Unit PCB with a New Mitsubishi OEM Board

High Pressure Switch (63H) Activated

🌡️ MXZ-4C36NAHZ 36,000 BTU 4-Zone Hyper-Heat Multi-Zone Outdoor Unit· 2 fixes· 90% success

Diagnose Refrigerant System and Replace High Pressure Switch if Needed

Heat Sink / Power Module Overheat Protection

🌡️ MXZ-4C36NAHZ 36,000 BTU 4-Zone Hyper-Heat Multi-Zone Outdoor Unit· 2 fixes· 85% success

Test and Replace Outdoor Fan Motor or Inverter Power Module

Compressor Overcurrent Protection (CT Sensor)

🌡️ MXZ-4C36NAHZ 36,000 BTU 4-Zone Hyper-Heat Multi-Zone Outdoor Unit· 2 fixes· 90% success

Test Compressor Windings and Replace Compressor if Faulty

High Head Pressure Protection

🌡️ MXZ-4C36NAHZ 36,000 BTU 4-Zone Hyper-Heat Multi-Zone Outdoor Unit· 2 fixes· 90% success

Diagnose and Repair High Pressure Transducer and Refrigerant System

Outdoor Subcooling Sensor / Pipe Thermistor Error

🌡️ MXZ-4C36NAHZ 36,000 BTU 4-Zone Hyper-Heat Multi-Zone Outdoor Unit· 2 fixes· 85% success

Test and Replace Outdoor Subcooling Sensor Thermistor

Compressor Overheating / High Pressure Switch Activation

🌡️ MXZ-4C36NAHZ 36,000 BTU 4-Zone Hyper-Heat Multi-Zone Outdoor Unit· 2 fixes· 90% success

Test and Replace Outdoor Fan Motor or Check Refrigerant Charge

Outdoor Heat Exchanger Thermistor Error

🌡️ MXZ-4C36NAHZ 36,000 BTU 4-Zone Hyper-Heat Multi-Zone Outdoor Unit· 2 fixes· 90% success

Test and Replace Outdoor Heat Exchanger Thermistor

Compressor Discharge Temperature Protection

🌡️ MXZ-4C36NAHZ 36,000 BTU 4-Zone Hyper-Heat Multi-Zone Outdoor Unit· 2 fixes· 90% success

Check Refrigerant Charge and Inspect for Circuit Restrictions

Reverse Phase / Phase Loss Detection

🌡️ MXZ-4C36NAHZ 36,000 BTU 4-Zone Hyper-Heat Multi-Zone Outdoor Unit· 2 fixes· 90% success

Verify Phase Sequence and Correct Wiring

Centralized Controller Address Error

🌡️ SUZ-KA09NA 9,000 BTU Concealed Duct System Outdoor Unit· 2 fixes· 90% success

Inspect and Reconfigure M-NET Network Wiring and Devices

Initial Startup Not Completed

🌡️ SUZ-KA09NA 9,000 BTU Concealed Duct System Outdoor Unit· 2 fixes· 90% success

Perform Full Commissioning and Firmware Verification

Address / Combination Setting Error

🌡️ SUZ-KA09NA 9,000 BTU Concealed Duct System Outdoor Unit· 2 fixes· 85% success

Replace Faulty Address Setting Switches or Control Board

Outdoor-to-Outdoor Communication Error

🌡️ SUZ-KA09NA 9,000 BTU Concealed Duct System Outdoor Unit· 2 fixes· 90% success

Verify Address Settings and Replace Faulty Communication Bus Components

Indoor-to-Outdoor Serial Communication Error

🌡️ SUZ-KA09NA 9,000 BTU Concealed Duct System Outdoor Unit· 2 fixes· 90% success

Test and Repair Signal Wiring Harness or Replace Control Board

Indoor/Outdoor Unit Communication Error

🌡️ SUZ-KA09NA 9,000 BTU Concealed Duct System Outdoor Unit· 2 fixes· 88% success

Test Communication Signal and Replace Damaged Signal Wire or Outdoor PCB

Inter-Outdoor-Unit Transmission Error

🌡️ SUZ-KA09NA 9,000 BTU Concealed Duct System Outdoor Unit· 2 fixes· 85% success

Test and Replace Damaged Inter-Unit Communication Wiring or Connectors

Outdoor Unit EEPROM / Address Error

🌡️ SUZ-KA09NA 9,000 BTU Concealed Duct System Outdoor Unit· 2 fixes· 90% success

Replace or Reflash Outdoor Unit PCB to Fix EEPROM Corruption

Low Pressure Protection / Low Refrigerant

🌡️ SUZ-KA09NA 9,000 BTU Concealed Duct System Outdoor Unit· 2 fixes· 90% success

Locate and Repair Refrigerant Leak, Evacuate, and Recharge System

Power Transistor (IGBT) Abnormality

🌡️ SUZ-KA09NA 9,000 BTU Concealed Duct System Outdoor Unit· 2 fixes· 90% success

Replace the Outdoor Unit Inverter Board (IPM Module)

Electrical Compartment Temperature Too High

🌡️ SUZ-KA09NA 9,000 BTU Concealed Duct System Outdoor Unit· 2 fixes· 90% success

Replace Electrical Compartment Temperature Sensor and Inspect Wiring

Outdoor Unit Main PCB Error

🌡️ SUZ-KA09NA 9,000 BTU Concealed Duct System Outdoor Unit· 2 fixes· 90% success

Replace the Outdoor Unit Main PCB Assembly

Outdoor Fan Motor Error

🌡️ SUZ-KA09NA 9,000 BTU Concealed Duct System Outdoor Unit· 2 fixes· 85% success

Test and Replace the Outdoor Fan Motor and Capacitor if Needed

Outdoor PCB EEPROM Error

🌡️ SUZ-KA09NA 9,000 BTU Concealed Duct System Outdoor Unit· 2 fixes· 90% success

Replace the Outdoor Unit PCB with a New Mitsubishi OEM Board

High Pressure Switch (63H) Activated

🌡️ SUZ-KA09NA 9,000 BTU Concealed Duct System Outdoor Unit· 2 fixes· 90% success

Diagnose Refrigerant System and Replace High Pressure Switch if Needed

Heat Sink / Power Module Overheat Protection

🌡️ SUZ-KA09NA 9,000 BTU Concealed Duct System Outdoor Unit· 2 fixes· 85% success

Test and Replace Outdoor Fan Motor or Inverter Power Module

Compressor Overcurrent Protection (CT Sensor)

🌡️ SUZ-KA09NA 9,000 BTU Concealed Duct System Outdoor Unit· 2 fixes· 90% success

Test Compressor Windings and Replace Compressor if Faulty

High Head Pressure Protection

🌡️ SUZ-KA09NA 9,000 BTU Concealed Duct System Outdoor Unit· 2 fixes· 90% success

Diagnose and Repair High Pressure Transducer and Refrigerant System

Outdoor Subcooling Sensor / Pipe Thermistor Error

🌡️ SUZ-KA09NA 9,000 BTU Concealed Duct System Outdoor Unit· 2 fixes· 85% success

Test and Replace Outdoor Subcooling Sensor Thermistor

Compressor Overheating / High Pressure Switch Activation

🌡️ SUZ-KA09NA 9,000 BTU Concealed Duct System Outdoor Unit· 2 fixes· 90% success

Test and Replace Outdoor Fan Motor or Check Refrigerant Charge

Outdoor Heat Exchanger Thermistor Error

🌡️ SUZ-KA09NA 9,000 BTU Concealed Duct System Outdoor Unit· 2 fixes· 90% success

Test and Replace Outdoor Heat Exchanger Thermistor

Compressor Discharge Temperature Protection

🌡️ SUZ-KA09NA 9,000 BTU Concealed Duct System Outdoor Unit· 2 fixes· 90% success

Check Refrigerant Charge and Inspect for Circuit Restrictions

Reverse Phase / Phase Loss Detection

🌡️ SUZ-KA09NA 9,000 BTU Concealed Duct System Outdoor Unit· 2 fixes· 90% success

Verify Phase Sequence and Correct Wiring

Centralized Controller Address Error

🌡️ PUZ-HA36NKA5 36,000 BTU Zuba Central Cold-Climate Heat Pump Outdoor Unit· 2 fixes· 90% success

Inspect and Reconfigure M-NET Network Wiring and Devices

Initial Startup Not Completed

🌡️ PUZ-HA36NKA5 36,000 BTU Zuba Central Cold-Climate Heat Pump Outdoor Unit· 2 fixes· 90% success

Perform Full Commissioning and Firmware Verification

Address / Combination Setting Error

🌡️ PUZ-HA36NKA5 36,000 BTU Zuba Central Cold-Climate Heat Pump Outdoor Unit· 2 fixes· 85% success

Replace Faulty Address Setting Switches or Control Board

Outdoor-to-Outdoor Communication Error

🌡️ PUZ-HA36NKA5 36,000 BTU Zuba Central Cold-Climate Heat Pump Outdoor Unit· 2 fixes· 90% success

Verify Address Settings and Replace Faulty Communication Bus Components

Indoor-to-Outdoor Serial Communication Error

🌡️ PUZ-HA36NKA5 36,000 BTU Zuba Central Cold-Climate Heat Pump Outdoor Unit· 2 fixes· 90% success

Test and Repair Signal Wiring Harness or Replace Control Board

Indoor/Outdoor Unit Communication Error

🌡️ PUZ-HA36NKA5 36,000 BTU Zuba Central Cold-Climate Heat Pump Outdoor Unit· 2 fixes· 88% success

Test Communication Signal and Replace Damaged Signal Wire or Outdoor PCB

Inter-Outdoor-Unit Transmission Error

🌡️ PUZ-HA36NKA5 36,000 BTU Zuba Central Cold-Climate Heat Pump Outdoor Unit· 2 fixes· 85% success

Test and Replace Damaged Inter-Unit Communication Wiring or Connectors

Outdoor Unit EEPROM / Address Error

🌡️ PUZ-HA36NKA5 36,000 BTU Zuba Central Cold-Climate Heat Pump Outdoor Unit· 2 fixes· 90% success

Replace or Reflash Outdoor Unit PCB to Fix EEPROM Corruption

Low Pressure Protection / Low Refrigerant

🌡️ PUZ-HA36NKA5 36,000 BTU Zuba Central Cold-Climate Heat Pump Outdoor Unit· 2 fixes· 90% success

Locate and Repair Refrigerant Leak, Evacuate, and Recharge System

Power Transistor (IGBT) Abnormality

🌡️ PUZ-HA36NKA5 36,000 BTU Zuba Central Cold-Climate Heat Pump Outdoor Unit· 2 fixes· 90% success

Replace the Outdoor Unit Inverter Board (IPM Module)

Electrical Compartment Temperature Too High

🌡️ PUZ-HA36NKA5 36,000 BTU Zuba Central Cold-Climate Heat Pump Outdoor Unit· 2 fixes· 90% success

Replace Electrical Compartment Temperature Sensor and Inspect Wiring

Outdoor Unit Main PCB Error

🌡️ PUZ-HA36NKA5 36,000 BTU Zuba Central Cold-Climate Heat Pump Outdoor Unit· 2 fixes· 90% success

Replace the Outdoor Unit Main PCB Assembly

Outdoor Fan Motor Error

🌡️ PUZ-HA36NKA5 36,000 BTU Zuba Central Cold-Climate Heat Pump Outdoor Unit· 2 fixes· 85% success

Test and Replace the Outdoor Fan Motor and Capacitor if Needed

Outdoor PCB EEPROM Error

🌡️ PUZ-HA36NKA5 36,000 BTU Zuba Central Cold-Climate Heat Pump Outdoor Unit· 2 fixes· 90% success

Replace the Outdoor Unit PCB with a New Mitsubishi OEM Board

High Pressure Switch (63H) Activated

🌡️ PUZ-HA36NKA5 36,000 BTU Zuba Central Cold-Climate Heat Pump Outdoor Unit· 2 fixes· 90% success

Diagnose Refrigerant System and Replace High Pressure Switch if Needed

Heat Sink / Power Module Overheat Protection

🌡️ PUZ-HA36NKA5 36,000 BTU Zuba Central Cold-Climate Heat Pump Outdoor Unit· 2 fixes· 85% success

Test and Replace Outdoor Fan Motor or Inverter Power Module

Compressor Overcurrent Protection (CT Sensor)

🌡️ PUZ-HA36NKA5 36,000 BTU Zuba Central Cold-Climate Heat Pump Outdoor Unit· 2 fixes· 90% success

Test Compressor Windings and Replace Compressor if Faulty

High Head Pressure Protection

🌡️ PUZ-HA36NKA5 36,000 BTU Zuba Central Cold-Climate Heat Pump Outdoor Unit· 2 fixes· 90% success

Diagnose and Repair High Pressure Transducer and Refrigerant System

Outdoor Subcooling Sensor / Pipe Thermistor Error

🌡️ PUZ-HA36NKA5 36,000 BTU Zuba Central Cold-Climate Heat Pump Outdoor Unit· 2 fixes· 85% success

Test and Replace Outdoor Subcooling Sensor Thermistor

Compressor Overheating / High Pressure Switch Activation

🌡️ PUZ-HA36NKA5 36,000 BTU Zuba Central Cold-Climate Heat Pump Outdoor Unit· 2 fixes· 90% success

Test and Replace Outdoor Fan Motor or Check Refrigerant Charge

Outdoor Heat Exchanger Thermistor Error

🌡️ PUZ-HA36NKA5 36,000 BTU Zuba Central Cold-Climate Heat Pump Outdoor Unit· 2 fixes· 90% success

Test and Replace Outdoor Heat Exchanger Thermistor

Compressor Discharge Temperature Protection

🌡️ PUZ-HA36NKA5 36,000 BTU Zuba Central Cold-Climate Heat Pump Outdoor Unit· 2 fixes· 90% success

Check Refrigerant Charge and Inspect for Circuit Restrictions

Reverse Phase / Phase Loss Detection

🌡️ PUZ-HA36NKA5 36,000 BTU Zuba Central Cold-Climate Heat Pump Outdoor Unit· 2 fixes· 90% success

Verify Phase Sequence and Correct Wiring

Centralized Controller Address Error

🌡️ PUZ-A18NKA 18,000 BTU P-Series Ducted Heat Pump Outdoor Unit· 2 fixes· 90% success

Inspect and Reconfigure M-NET Network Wiring and Devices

Initial Startup Not Completed

🌡️ PUZ-A18NKA 18,000 BTU P-Series Ducted Heat Pump Outdoor Unit· 2 fixes· 90% success

Perform Full Commissioning and Firmware Verification

Address / Combination Setting Error

🌡️ PUZ-A18NKA 18,000 BTU P-Series Ducted Heat Pump Outdoor Unit· 2 fixes· 85% success

Replace Faulty Address Setting Switches or Control Board

Outdoor-to-Outdoor Communication Error

🌡️ PUZ-A18NKA 18,000 BTU P-Series Ducted Heat Pump Outdoor Unit· 2 fixes· 90% success

Verify Address Settings and Replace Faulty Communication Bus Components

Indoor-to-Outdoor Serial Communication Error

🌡️ PUZ-A18NKA 18,000 BTU P-Series Ducted Heat Pump Outdoor Unit· 2 fixes· 90% success

Test and Repair Signal Wiring Harness or Replace Control Board

Indoor/Outdoor Unit Communication Error

🌡️ PUZ-A18NKA 18,000 BTU P-Series Ducted Heat Pump Outdoor Unit· 2 fixes· 88% success

Test Communication Signal and Replace Damaged Signal Wire or Outdoor PCB

Inter-Outdoor-Unit Transmission Error

🌡️ PUZ-A18NKA 18,000 BTU P-Series Ducted Heat Pump Outdoor Unit· 2 fixes· 85% success

Test and Replace Damaged Inter-Unit Communication Wiring or Connectors

Outdoor Unit EEPROM / Address Error

🌡️ PUZ-A18NKA 18,000 BTU P-Series Ducted Heat Pump Outdoor Unit· 2 fixes· 90% success

Replace or Reflash Outdoor Unit PCB to Fix EEPROM Corruption

Low Pressure Protection / Low Refrigerant

🌡️ PUZ-A18NKA 18,000 BTU P-Series Ducted Heat Pump Outdoor Unit· 2 fixes· 90% success

Locate and Repair Refrigerant Leak, Evacuate, and Recharge System

Power Transistor (IGBT) Abnormality

🌡️ PUZ-A18NKA 18,000 BTU P-Series Ducted Heat Pump Outdoor Unit· 2 fixes· 90% success

Replace the Outdoor Unit Inverter Board (IPM Module)

Electrical Compartment Temperature Too High

🌡️ PUZ-A18NKA 18,000 BTU P-Series Ducted Heat Pump Outdoor Unit· 2 fixes· 90% success

Replace Electrical Compartment Temperature Sensor and Inspect Wiring

Outdoor Unit Main PCB Error

🌡️ PUZ-A18NKA 18,000 BTU P-Series Ducted Heat Pump Outdoor Unit· 2 fixes· 90% success

Replace the Outdoor Unit Main PCB Assembly

Outdoor Fan Motor Error

🌡️ PUZ-A18NKA 18,000 BTU P-Series Ducted Heat Pump Outdoor Unit· 2 fixes· 85% success

Test and Replace the Outdoor Fan Motor and Capacitor if Needed

Outdoor PCB EEPROM Error

🌡️ PUZ-A18NKA 18,000 BTU P-Series Ducted Heat Pump Outdoor Unit· 2 fixes· 90% success

Replace the Outdoor Unit PCB with a New Mitsubishi OEM Board

High Pressure Switch (63H) Activated

🌡️ PUZ-A18NKA 18,000 BTU P-Series Ducted Heat Pump Outdoor Unit· 2 fixes· 90% success

Diagnose Refrigerant System and Replace High Pressure Switch if Needed

Heat Sink / Power Module Overheat Protection

🌡️ PUZ-A18NKA 18,000 BTU P-Series Ducted Heat Pump Outdoor Unit· 2 fixes· 85% success

Test and Replace Outdoor Fan Motor or Inverter Power Module

Compressor Overcurrent Protection (CT Sensor)

🌡️ PUZ-A18NKA 18,000 BTU P-Series Ducted Heat Pump Outdoor Unit· 2 fixes· 90% success

Test Compressor Windings and Replace Compressor if Faulty

High Head Pressure Protection

🌡️ PUZ-A18NKA 18,000 BTU P-Series Ducted Heat Pump Outdoor Unit· 2 fixes· 90% success

Diagnose and Repair High Pressure Transducer and Refrigerant System

Outdoor Subcooling Sensor / Pipe Thermistor Error

🌡️ PUZ-A18NKA 18,000 BTU P-Series Ducted Heat Pump Outdoor Unit· 2 fixes· 85% success

Test and Replace Outdoor Subcooling Sensor Thermistor

Compressor Overheating / High Pressure Switch Activation

🌡️ PUZ-A18NKA 18,000 BTU P-Series Ducted Heat Pump Outdoor Unit· 2 fixes· 90% success

Test and Replace Outdoor Fan Motor or Check Refrigerant Charge

Outdoor Heat Exchanger Thermistor Error

🌡️ PUZ-A18NKA 18,000 BTU P-Series Ducted Heat Pump Outdoor Unit· 2 fixes· 90% success

Test and Replace Outdoor Heat Exchanger Thermistor

Compressor Discharge Temperature Protection

🌡️ PUZ-A18NKA 18,000 BTU P-Series Ducted Heat Pump Outdoor Unit· 2 fixes· 90% success

Check Refrigerant Charge and Inspect for Circuit Restrictions

Reverse Phase / Phase Loss Detection

🌡️ PUZ-A18NKA 18,000 BTU P-Series Ducted Heat Pump Outdoor Unit· 2 fixes· 90% success

Verify Phase Sequence and Correct Wiring

Centralized Controller Address Error

🌡️ MUZ-GL09NA 9,000 BTU Single-Zone Outdoor Unit· 2 fixes· 90% success

Inspect and Reconfigure M-NET Network Wiring and Devices

Initial Startup Not Completed

🌡️ MUZ-GL09NA 9,000 BTU Single-Zone Outdoor Unit· 2 fixes· 90% success

Perform Full Commissioning and Firmware Verification

Address / Combination Setting Error

🌡️ MUZ-GL09NA 9,000 BTU Single-Zone Outdoor Unit· 2 fixes· 85% success

Replace Faulty Address Setting Switches or Control Board

Outdoor-to-Outdoor Communication Error

🌡️ MUZ-GL09NA 9,000 BTU Single-Zone Outdoor Unit· 2 fixes· 90% success

Verify Address Settings and Replace Faulty Communication Bus Components

Indoor-to-Outdoor Serial Communication Error

🌡️ MUZ-GL09NA 9,000 BTU Single-Zone Outdoor Unit· 2 fixes· 90% success

Test and Repair Signal Wiring Harness or Replace Control Board

Indoor/Outdoor Unit Communication Error

🌡️ MUZ-GL09NA 9,000 BTU Single-Zone Outdoor Unit· 2 fixes· 88% success

Test Communication Signal and Replace Damaged Signal Wire or Outdoor PCB

Inter-Outdoor-Unit Transmission Error

🌡️ MUZ-GL09NA 9,000 BTU Single-Zone Outdoor Unit· 2 fixes· 85% success

Test and Replace Damaged Inter-Unit Communication Wiring or Connectors

Outdoor Unit EEPROM / Address Error

🌡️ MUZ-GL09NA 9,000 BTU Single-Zone Outdoor Unit· 2 fixes· 90% success

Replace or Reflash Outdoor Unit PCB to Fix EEPROM Corruption

Related Symptoms

❄️AC Not Cooling 🌡️AC Blowing Warm 🧊AC Freezing Up 🌡️Heat Pump Not Heating 💡HVAC Blinking Lights

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