Air Conditioner
LG
Updated Jul 17, 2026
LG AC CH47 Error — Electronic Expansion Valve (EEV) Fault & Fix
CH47
LG · Air ConditionerCH47 means the electronic expansion valve (EEV) or its thermistor sensor on the outdoor un…
Quick answer
CH47 means the electronic expansion valve (EEV) or its thermistor sensor on the outdoor unit is faulty.
What CH47 means
The EEV precisely controls how much refrigerant flows into the evaporator. CH47 triggers when the EEV's feedback thermistor reports an abnormal reading, or when the valve coil itself is not responding to the control signal.
Technician-level repair. The EEV is part of the sealed refrigerant system.
How to fix it
What does the CH47 code mean?
CH47 is an electronic expansion valve fault or its associated thermistor sensor fault on the outdoor unit.
Common causes
- EEV coil failure (not responding to step commands)
- EEV thermistor open or short circuit
- Debris blocking the valve
- Outdoor PCB EEV driver circuit failure
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How to fix the CH47 error
Power cycle
Turn the breaker off for 10 minutes. The EEV resets its position on power-up.
Listen for the valve
On restart, you should hear faint stepping sounds from the EEV. Silence suggests a dead coil.
Check the EEV connector
Reseat on the outdoor PCB.
Call a technician
EEV replacement involves the sealed refrigerant circuit and must be done by a licensed professional.
Safety first: The EEV is brazed into the refrigerant piping. Replacement requires recovering refrigerant — licensed technician work only.
Part you may need: Electronic expansion valve (EEV) / EEV thermistor
EEV failures are more common in systems over 5-7 years old or in areas with dirty refrigerant (from poor installation practices).
Frequently asked questions
Can I clean the EEV?
Not easily — it is a precision valve inside the refrigerant circuit. Replacement is standard.
What happens if I ignore CH47?
The AC will either not cool at all or cool very poorly. The compressor may eventually overheat.
✎ 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.
