Panasonic CS-VZ9SKE Service Manual page 119

17.4.18 H96 (2-Way and 3-Way Valve Opening Failure Check)
Troubleshooting
Check if the 2-way and 3-way valves are open.
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
Check for the characteristics of the indoor unit intake air temperature sensor.
 Refer to the characteristic table for electronic circuit diagram.
(Remove the connector and check the resistance value of the sensor.)
Check the gas pressure during the rated cooling operation.
Check for presence of gas leak.
Diagnosis Procedures and Cause
Open
 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
An abnormality is observed
(Lower than the standard value)
There is a gas leak
Closed
An abnormality
is observed
An abnormality
is observed
No abnormality
is observed
There is no
gas leak
119
Measures to be Taken
Open the 2-way and 3-way valves.
Replace the indoor unit heat
exchanger temperature sensor.
Replace the indoor unit intake air
temperature sensor.
Replace the indoor unit control board.
Replace the capillary tube or
expansion valve.
Replace the part from which gas is
leaking.