Compressor System Sensor Abnormality - Daikin FTX50GV1B Service Manual

Troubleshooting

4.19 Compressor System Sensor Abnormality

4.19.1 RX50/60G2V1B, 71 Class
H0
Error Code
Method of Error
Detection
Error Decision
Conditions
Supposed
Causes
Troubleshooting
81
The system checks the power supply voltage and the DC voltage before the compressor
starts.
The system checks the compressor current right after the compressor starts.
The power supply voltage and the DC voltage is obviously low or high.
The compressor current does not run when the compressor starts.
Disconnection of reactor
Disconnection of compressor harness
Defective outdoor unit PCB
Defective compressor
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
SiBE041029EC
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)
Service Diagnosis