Failure Diagnosis for Inverter System PACD011001C2
534 Troubleshooting UM Combination “MA1R Series” Using R-407C
4.2 How to Use The Monitor Switch on The Inverter PC Board
The monitor lets you know the contents of the latest stop due to malfunction by LED display on the inverter
PC Board. The inverter is equipped with a retry function that retries operation each time stop due to
malfunction occurs, and malfunction is therefore not ascertained by merely entering the five minutes
standby while retry is attempted the prescribed number of times. If the number of retry times is exceeded
within 60 minutes, malfunction is ascertained, and the corresponding malfunction code is displayed on the
indoor unit remote controller.
9
: Blink
8
: On
7
: Off
LED A 1 2 3 4 Malfunction contents Retry times
97777
Normal
9
7778
Malfunction of fin thermistor 3
98877
Sensor malfunction 0
98778
Insufficient voltage 3
97787
Instantaneous over-current 3
97888
Electronic thermistor 3
98888
Stall prevention 3
97877
Open phase detection 3
77777
Malfunction of microcomputer Unlimited
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