Daikin FTXS30HVJU - Compressor System Sensor Abnormality

Troubleshooting SiUS04-924
90 Service Diagnosis
4.16 Compressor System Sensor Abnormality
Remote
Controller
Display
H0
Method of
Malfunction
Detection
 Fault condition is identified by the supply voltage and the DC voltage which is detected before
the compressor startup.
 Fault condition is identified by compressor current which is detected right after the compressor
startup.
Malfunction
Decision
Conditions
 The detected valve of the supply voltage and the DC voltage is obviously low or high.
 The compressor current does not run when the compressor is started.
Supposed
Causes
 Reactor disconnection
 Compressor disconnection
 Outdoor unit PCB defective
 Compressor defective
Troubleshooting
Connect properly.
(R7174)
NO
YES
Connect properly.
NO
YES
Replace the reactor.
NO
YES
Replace the compressor or
the compressor relay
harness
Check the operation again
and if the error appears
again, replace the outdoor
unit PCB
NO
YES
Disconnect the reactor from the outdoor
unit PCB and measure the resistance
value between reactor terminals with
tester.
Disconnect the compressor relay harness
from the outdoor unit PCB and use the
tester to measure the resistance value
between the 3 terminals of the compressor.
Caution
Be sure to turn off the power switch before connecting or disconnecting
the connector, or parts damage may occur.
Between each
terminal 10W or less?
Compressor connection check
Reactor check
Compressor check
Turn off the power
Reactor connection check
Connection OK?
Connection OK?
10W or less?