Compressor System Sensor Abnormality - Daikin MKS-T Series Service Manual

Troubleshooting for Outdoor Unit

7.15 Compressor System Sensor Abnormality

H0
Error Code
Outdoor Unit LED
A j 1 i 2 i 3 h 4 h 5 h
Display
Method of Error  The system checks the power supply voltage and the DC voltage before the compressor
Detection
 The system checks the compressor current right after the compressor starts.
Error Decision
 The power supply voltage and the DC voltage is obviously low or high.
Conditions  The compressor current does not run when the compressor starts.
Supposed  Disconnection of reactor
Causes  Disconnection of compressor harness
 Defective outdoor unit PCB
 Defective compressor
Troubleshooting
157
starts.
Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
Turn off the power.
Check the connection of the
reactor.
Connection OK?
YES
Check the connection of the
compressor.
Connection OK?
YES
Check the reactor.
10 Ω or less?
YES
Check the compressor.
10 Ω or less
between each terminal?
YES
NO
NO
Disconnect the reactor from the outdoor
unit PCB and measure the resistance
value between reactor terminals with
multimeter.
NO
Disconnect the compressor relay harness
from the outdoor unit PCB and measure
the resistance value between the each 3
terminals of the compressor with
multimeter.
NO
SiSG121917E
Connect the reactor
properly.
Connect the compressor
properly.
Replace the reactor.
Replace the compressor or
the compressor relay
harness.
Restart the operation again
and if the error occurs
again, replace the outdoor
unit PCB (main PCB).
(R20419)
Part 6 Service Diagnosis