Panasonic CS-MS9SD3H Service Manual page 56

13.5.14 H98 (Error Code Stored in Memory and no alarm is triggered / no TIMER LED
flashing)
Malfunction Decision Conditions

Indoor high pressure is detected when indoor heat exchanger is detecting very high temperature when the unit is
operating in heating operation.

Phenomena: unit is stopping and re-starting very often in heating mode.
Malfunction Caused

Indoor heat exchanger thermistor

Clogged air filter or heat exchanger

Over-bent pipe (liquid side)
Troubleshooting
When abnormality indication starts again
Check the indoor unit intake air filter
Is the air filter dirty?
Check the dust accumulation on the indoor unit heat exchanger
Is the indoor unit heat exchanger dirty?
Check the indoor pipe temperature thermistor:
● Plug out connector (CN-TH) from the indoor unit PCB
●
Measure the resistance of the indoor heat exchanger
temperature thermistor
Is the measured resistance of the indoor pipe temperature
thermistor matches the value specified in its characteristic
chart?
NO
NO
YES
Caution
YES
● Clean the air filter
YES
●
Clean the indoor unit heat exchanger
● Defect in indoor pipe temperature
NO
thermistor
● Replace the indoor pipe temperature
thermistor
● Check the piping & installation condition
● Replace piping / reinstall the unit
if necessary
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For safety reason and to prevent
component breakdown, always switch
off the power before remove and
connect the component.