Air Conditioner
LG
Updated Jul 23, 2026
LG AC CH62 Error — Inverter Heat-Sink Sensor Fault & Fix
CH62
LG · Air ConditionerCH62 means the inverter heat-sink temperature sensor (thermistor) on the outdoor PCB is fa…
Quick answer
CH62 means the inverter heat-sink temperature sensor (thermistor) on the outdoor PCB is faulty — open or short circuit.
What CH62 means
The inverter's power electronics (IPM/IGBT modules) generate significant heat. A heat sink with a thermistor monitors their temperature. CH62 means this thermistor has failed, so the board cannot protect the inverter from overheating.
How to fix it
What does the CH62 code mean?
CH62 is an inverter heat-sink thermistor fault (open or short circuit) on the outdoor inverter PCB.
Common causes
- Failed heat-sink thermistor
- Loose connector on the inverter board
- Thermistor detached from the heat sink surface
- Inverter PCB fault
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How to fix the CH62 error
Power off
Isolate at the breaker.
Call a technician
The inverter compartment contains high-voltage DC bus components.
Technician actions
Reseat the heat-sink sensor connector, measure its resistance, and replace if faulty. Also check that the heat sink itself is clean and the heat-sink fan (if present) is working.
Replace inverter PCB if needed
If the thermistor circuit on the board is damaged, the full PCB may need replacement.
Safety first: The inverter heat sink carries lethal DC voltage from charged capacitors. Only a qualified technician should access it.
Part you may need: Inverter heat-sink thermistor / outdoor inverter PCB
If the heat-sink fins are clogged with dust, clean them — a hot heat sink can kill the IPM even with a working sensor.
Frequently asked questions
Can dust cause CH62?
Dust on the heat sink does not cause CH62 (which is a sensor fault), but it can cause CH27 (IPM overtemperature). Keep the heat sink clean regardless.
Is CH62 expensive?
If only the thermistor is faulty, it is inexpensive. If the PCB is damaged, it is more costly.
✎ Written by
REZAUL Karim (Riad)
REZAUL Karim (Riad) is the founder of ErrFixHub and a hands-on electronics and home-appliance repair specialist with over 15 years of experience diagnosing and fixing air conditioners, washing machines, refrigerators, inverters and other household appliances. He built ErrFixHub to turn cryptic error codes into clear, step-by-step fixes anyone can follow — cross-checking every code against manufacturer documentation and real repair-bench experience.
