9-2. Outdoor Unit Trouble Diagnostics
If a protective device has activated or there is a sensor failure in the outdoor unit, the 6 error monitor lamps on the
outdoor control circuit board will indicate the nature of the trouble.
● Outdoor control circuit board
E R R
Error contents
Compressor discharge temperature sensor
Heat exchanger temperature sensor
Branch tubing A sensor (narrow tubing)
Branch tubing B sensor (narrow tubing)
Branch tubing C sensor (narrow tubing)
Branch tubing D sensor (narrow tubing)
Outdoor air temperature sensor
Branch tubing A sensor (wide tubing)
Branch tubing B sensor (wide tubing)
Branch tubing C sensor (wide tubing)
Branch tubing D sensor (wide tubing)
CT (current) sensor
HIC protective device (current, temperature)
OTP data failure
Current peak exceeded
Current control failure
Active failure
Compressor discharge temperature high
Zero-cross failure
DC compressor rotation failure
3
φ
200 V open phase
Compressor internal thermostat activated
High-pressure switch activated
Miswiring, incorrect tubing connections
Freeze-prevention activated
Reset count exceeded
012345
E R R
Error contents
012345
Error monitor lamps
: ON : OFF
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