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17.4.20 H98 (Indoor Unit Overpressure Protection)
Troubleshooting
Diagnosis Procedures and Cause
Measures to be Taken
For some models, the sensor is not connected by a connector but it is directly soldered to the board.
In this case, replace the control board.
No abnormality is observed
No abnormality is observed
An abnormality is observed
Disconnection/Imperfect
connection of the connector
Check for bad connection of the connector of indoor unit heat
exchanger temperature sensor.
Fix the problem.
Replace the indoor unit heat
exchanger temperature sensor.
Replace the indoor unit control board.
Check for the characteristics of the indoor unit heat exchanger
temperature sensor.
Refer to the characteristic table for electronic circuit diagram.
(Remove the connector and check the resistance value of the sensor.)
No abnormality is observed
An abnormality is observed
Check for clogged filter on the indoor unit.
Clean the filter.
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