Daikin FCQ18PVJU Service Manual page 90

Troubleshooting by Remote Controller
<Monitor mode>
To enter the monitor mode, push the
MODE (BS1) button when in
"Setting mode 1".
<Selection of setting item>
Push the SET (BS2) button and set
the LED display to a setting item.
<Confirmation of malfunction 1>
Push the RETURN (BS3) button
once to display "First digit" of
malfunction code.
<Confirmation of malfunction 2>
Push the SET (BS2) button once to
display "Second digit" of malfunction
code.
<Confirmation of malfunction 3>
Push the SET (BS2) button once to
display "malfunction location".
<Confirmation of malfunction 4>
Push the SET (BS2) button once to
display "master or slave 1 or slave 2"
and "malfunction location".
Push the RETURN (BS3) button and
switches to the initial status of
"Monitor mode".
∗ Push the MODE (BS1) button and
returns to "Setting mode 1".
83
Faulty temperature sensor of inverter
radiation fin
Refrigerant shortage
Abnormal power supply voltage
No implementation of test-run
Transmission error between indoor
and outdoor unit
Faulty system malfunction
Conflict in wiring and piping, no setting
for system
Detail
description
on next
page.
Contents of malfunction
Faulty thermistor of inverter fin
Refrigerant shortage alarm
Insufficient Inverter voltage
Faulty charge of capacitor in main inverter circuit
Malfunction due to SP-PAM overvoltage
Malfunction due to P-N short circuit
I/O transmission error
I/O transmission error
Wiring error (Auto-address error)
Conflict in wiring and piping
SiUS28-902_a
Malfunction
code
P4
U0
U2
U3
U4
UH
UF
Troubleshooting