Panasonic CS-Z25YKEA Service Manual page 143

17.4.19 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
143