Air Conditioner
Walton
Updated Jul 24, 2026
Walton AC F2 Error — Outdoor Coil Temperature Sensor Fault & Fix
F2
Walton · Air ConditionerF2 on a Walton AC means the outdoor condenser coil temperature sensor (T3 thermistor) has…
Quick answer
F2 on a Walton AC means the outdoor condenser coil temperature sensor (T3 thermistor) has an open or short circuit.
What F2 means
The condenser coil sensor monitors the temperature of the outdoor heat exchanger. The inverter board uses this reading to control compressor speed and protect against high-pressure conditions. Without it, the board cannot manage the refrigerant cycle safely.
How to fix it
- Power off at the breaker.
- Find the sensor — clipped to the outdoor condenser coil pipe.
- Reseat the connector at the outdoor PCB.
- Measure resistance — replace if out of spec.
- Ensure good pipe contact when installing the replacement.
What does the F2 code mean?
F2 indicates the outdoor condenser coil temperature sensor (T3) has an open or short circuit.
Common causes
- Faulty condenser coil thermistor
- Loose connector on the outdoor PCB
- Heat damage to sensor wire (proximity to hot pipes)
- Outdoor PCB fault (rare)
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How to fix the F2 error
Power off
Isolate at the breaker.
Find the sensor
Clipped to the condenser coil pipe.
Reseat connector
Check at the outdoor PCB.
Measure resistance
Replace if open or zero.
Ensure pipe contact
Clip firmly for accurate readings.
Safety first: Let the outdoor unit cool before handling sensors near hot pipes.
Part you may need: Outdoor condenser coil temperature sensor (NTC thermistor)
Route the replacement sensor wire away from the compressor discharge pipe to prevent heat damage.
Frequently asked questions
Is F2 the same as E5?
No — E5 is the indoor coil sensor; F2 is the outdoor coil sensor. Both are pipe thermistors but in different units.
Can a dirty condenser cause F2?
No — F2 is an electrical sensor fault. A dirty condenser causes different symptoms (poor cooling, high pressure).
✎ 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.
