Symbol Diagnosis Diagnosis method
F96 IPM (Power transistor
module) or
compressor
overheating
When this trouble is detected from the electrical parts radiation fin temperature sensor and OLP output during
operation, operation stops, and it is restarted 3 minutes later. If the trouble occurs on 4 occasions, operation
stops, and the trouble display appears.
<Diagnosis checkpoint>
1. Something may be interfering with the dissipation of the heat outdoors or the outdoor unit fan may be
defective. (The outdoor unit fan is not running.)
2. Defective IPM (Outdoor unit control P.C. Board)
3. Gas leaks. Shutting valve is not opened.
F97 Compressor high
discharge temperature
This trouble display appears and operation stops when this happens on 6 occasions (it is cleared when the
operation is normal for 20 minutes).
<Diagnosis checkpoint>
1. Check the refrigerating cycle: Gas may be leaking (The amount of refrigerant is low). The stopping of the
outdoor unit from time to time is a symptom of this trouble.
2. When operation steps with this trouble display appearing, check the compressor temperature sensor. (Check
for changes in its characteristics and check its resistance.)
3. Something may be interfering with the dissipation of the heat outdoors or the outdoor unit fan may be
defective. (The fan will not run because of open-circuiting.)
(The protection may be activated by an overload, and the F97 trouble display will remain stored in the
memory.)
F98 Total running current
protection
When the total current exceeds the setting (17A to 20A), frequency control is started, and if it then exceeds the
setting, operation stops, and the trouble display appears.
<Diagnosis checkpoint>
1. Check the AC voltage at the outdoor unit terminal board during operation: The voltage drop must be within
5% of the voltage when operation has stopped (±110% of rated voltage even during operation). If the voltage
drop exceeds 5% of if the voltage changes suddenly, inspect whether the power supply cord and
indoor/outdoor unit connection cables are too long or too small in diameter, etc.
2. Check whether something is interfering with the dissipation of the heat exchanger outdoors (during cooling
operation): Normally, the capacity is limited by the current so that outdoor unit doesn’t stop, and the
diagnostic display does not appear.
F99 DC peak detection When "Output current trouble", which occurs when the prescribed current level is exceeded, has occurred on 16
consecutive occasions, operation stops, and the trouble display appears.
<Diagnosis checkpoint>
1. Check whether the compressor is defective (locked up or shorted winding). Check the outdoor unit control
P.C. Board.
92
CS-ME7DKEG CS-ME10DD3 EG / CS-ME10DTEG CS-E15DB4EW
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