– 151 –
Check code
Location
of
detection
System
status
Description
Error detection
condition(s)
Check items (locations)
Outdoor 7-segment display
Main
remote
controller
Check
code
Sub-code
P20 —P20
I/F All stop Pd sensor detects pressure
equal to or greater than
3.6MPa.
• Check for defect in Pd pressure sensor.
• Check service valves (discharge gas
side, suction gas side, liquid side) to
confirm full opening.
• Check for defect in outdoor fan.
• Check for defect in outdoor fan motor.
• Check outdoor PMVs (PMV1, 2, 4) for
clogging.
• Check indoor/outdoor heat exchangers
for clogging.
• Check for short-circuiting of outdoor
suction/discharge air flows.
• Check SV2 circuit for clogging.
• Check 4-way valve operation error.
• Check for defect in outdoor P.C. board
(I/F).
• Check for defect in indoor fan system
(possible cause of air flow reduction).
• Check opening status of indoor PMV.
• Check indoor-outdoor communication
line for wiring error.
• Check for faulty operation of check valve
in discharge pipe convergent section.
• Check gas balancing SV4 valve circuit.
• Check mispiping of suction gas/
discharge gas main pipes.
• Check discharge gas pipe checked
valve operation error.
• Check SV11 valve circuit.
(Clogging, OFF at one side only)
• Check clogging of circuit at sub heat
exchanger liquid side.
(Miswiring, disconnection, wiring
forgotten)
• Check Cool/Heat FS unit.
Clogging of SVD valve, operation error
check
Wiring check in FS unit
(SVD/SVS coil miswiring, etc.)
Wiring check between FS unit and
inside of room
(Miswiring, disconnection, wiring
forgotten)
• Check SV5 valve circuit.
• Check for refrigerant overcharging.
Activation of
high-pressure
protection
P22P22
IPDU All stop (Sub code: 0
∗
)
Fan IPDU overcurrent
protective circuit
A status that the current flows
over the fixed amount when the
fan was activated was detected.
• Fan motor check
• Check for fan IPDU board error
All stop (Sub code: 1
∗
)
Fan IPDU position detective
circuit
The position detection was not
normally performed.
• Fan motor check
• Connection check for fan motor
connectors
• Check for fan IPDU board error
All stop (Sub code: 3
∗
)
External elements by gust,
obstacles, etc.
Velocity estimate was not
correctly performed.
• Fan motor check
• Check for fan IPDU board error
All stop (Sub code: 4
∗
)
Fan IPDU overcurrent
protective circuit
A status that the current flows
over the fixed amount when the
fan operated was detected.
• Fan motor check
• Connection check for fan motor
connectors
• Check for fan IPDU board error
All stop (Sub code: C
∗
)
Temperature of TH sensor over
the fixed value was detected
during operation of the fan.
• Fan motor check
• Check for fan IPDU board error
All stop (Sub code: D
∗
)
The resistance value of the
sensor is infinite.
Or 0 (at Open / Short)
• Check for fan IPDU board error
All stop (Sub code: E
∗
)
Protection for fan IPDU DC
voltage
DC voltage detected over the
fixed value or below the fixed
value.
• Power supply voltage check
• Check for fan IPDU board error
• Connection check for fan IPDU
connectors
Outdoor fan
IPDU error
0
∗
: IGBT circuit
1
∗
: Position
detection
circuit error
3
∗
: Motor lockup
error
4
∗
: Motor current
detection
C
∗
: TH sensor
temperature
error
D
∗
: TH sensor
error
E
∗
: Inverter DC
voltage error
(outdoor fan)
Note:
Although
letters 0 to F
appear at
locations
indicated by
“
∗
”, please
ignore them.
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