H28
Panasonic H28 Error Code – Outdoor Heat Exchanger Sensor Error
Air Conditioner · HIGH Severity
What This Error Means
Outdoor heat exchanger temperature sensor abnormality
Diagnostic & Repair Steps
1
Power Reset
Turn off at breaker, wait 5 min, restart.
Turn off at breaker, wait 5 min, restart.
RESET
~5 min
2
Locate Outdoor Heat Exchanger Sensor
Find thermistor on outdoor coil.
Find thermistor on outdoor coil.
INSPECT
~10 min
3
Check Sensor Connection
Disconnect and reconnect.
Disconnect and reconnect.
CHECK
~5 min
4
Test Sensor Continuity
Replace if faulty. ⚠️ Disconnect power first
Replace if faulty. ⚠️ Disconnect power first
TEST
~15 min
5
Replace Sensor
Replace faulty thermistor.
Replace faulty thermistor.
REPLACE
~20 min
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