ErrorCodeDoctor
Panasonic Air Conditioner H28 error code
The H28 error means your Panasonic air conditioner detected a fault with the first outdoor heat exchanger temperature sensor. This sensor monitors the temperature of the outdoor condenser coil to regulate the refrigerant cycle. When it develops a fault the unit cannot manage the refrigerant cycle safely and stops operating. A qualified technician will need to inspect and replace the sensor.
Common causes
- Outdoor heat exchanger temperature sensor 1 has malfunctioned or failed
- Wiring to the sensor is loose or damaged
- Sensor is giving an out-of-range reading
How to fix it
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1
Turn off the unit at the circuit breaker and wait 5 minutes then try restarting
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2
If H28 returns contact a qualified technician to inspect and replace the outdoor heat exchanger temperature sensor
Related Panasonic Air Conditioner error codes
H28 error — frequently asked questions
What does the H28 error mean on a Panasonic air conditioner?
Outdoor heat exchanger temperature sensor 1 has an abnormality
What causes the H28 error?
The H28 error is usually caused by: Outdoor heat exchanger temperature sensor 1 has malfunctioned or failed; Wiring to the sensor is loose or damaged; Sensor is giving an out-of-range reading.
Can I fix the H28 error myself?
This is rated a hard fix — it often requires tools, parts, or experience, and may be safer left to a professional technician.
How much does it cost to fix the H28 error?
Fixing the H28 error on a Panasonic air conditioner typically costs $80–$200, depending on parts and whether you do it yourself or hire a technician.
Is it safe to keep using my air conditioner with the H28 error?
We'd recommend addressing the H28 error before continuing to use the air conditioner, since hard-rated issues often involve a real fault rather than a minor glitch.