Toshiba MMW-AP0481CHQ-E Service Manual page 63

Check code
Outdoor 7-segment display
Main
remote
Check
controller Sub-code
code
P20 P20 —
#0:Element short circuit
#1:Position detection
circuit trouble
#3:Motor lock trouble
#4:Motor current trouble
P22 P22
#C:TH sensor
temperature trouble
#D:TH sensor short
circuit/release trouble
#E:Vdc voltage trouble
Location
Description
of
detection
I/F Activation of
high-pressure
protection
IPDU Outdoor fan
IPDU trouble
* Put in Fan
IPDU No. in [#]
mark
Check code detection
System status
condition(s)
All stop <During cooling operation>
PD sensor detects
pressure equal to or
greater than 3.85 MPa.
<During heating operation>
PD sensor detects
pressure equal to or
greater than 3.6MPa.
All stop (Sub code: #0)
Fan IPDU over current
protection circuit
Flow of current equal to
or greater than the
specified value is
detected during startup
of the fan.
All stop (Sub code: #1)
Fan IPDU position
detection circuit Position
detection is not going on
normally.
All stop (Sub code: #3)
Gusty wind, an
obstruction, or another
external factor
Speed estimation is not
going on normally.
All stop (Sub code: #4)
Fan IPDU over current
protection circuit
Flow of current equal to
or greater than the
specified value is
detected during operation
of the fan.
All stop (Sub code: #C)
Higher temperature than
the specified value is
detected during operation
of the fan.
All stop (Sub code: #D)
The resistance value of
the sensor is infinite or
zero (open or short circuit).
All stop (Sub code: #E)
Fan IPDU DC voltage
protection circuit
The DC voltage higher or
lower than the specified
value is detected.
– 63 –
Check items (locations)
• Check for trouble in PD pressure
sensor.
• Check service valves (gas side,
liquid side) to confirm full opening.
• Check for trouble in outdoor fan.
• Check for trouble in outdoor fan
motor.
• Check outdoor PMV (PMV1, 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 for trouble in outdoor P.C.
board (I/F).
• Check for trouble in indoor fan
system (possible cause of air flow
reduction).
• Check opening status of indoor
PMV.
• Check indoor-outdoor
communication line for wiring
trouble.
• Check for trouble operation of
check valve in discharge pipe
convergent section.
• Check gas balancing SV4 valve
circuit.
• Check SV5 valve circuit.
• Check for refrigerant overcharging.
• Check fan motor.
• Check for trouble in fan IPDU P.C.
board
• Check fan motor.
• Check connection of fan motor
connector.
• Check for trouble in fan IPDU P.C.
board.
• Check fan motor.
• Check for trouble in fan IPDU P.C.
board
• Check fan motor.
• Check connection of fan motor
connector.
• Check for trouble in fan IPDU P.C.
board.
• Check fan motor.
• Check for trouble in fan IPDU P.C.
board
• Check for trouble in fan IPDU P.C.
board.
• Check power voltage of the main
power supply.
• Check for trouble in fan IPDU P.C.
board.
• Check connection of fan IPDU P.C.
board.