Toshiba MMU-AP0074YH-E(-TR) Service Manual page 91

Check code
Outdoor 7-segment display
Main
remote
Check
controller
Sub-code
code
P20 P20 —
SMMS (Series 1)
08: Out of step
0A: IDC
activation
0E: Sync error
0F: Control error
06: Maximum
rotation
exceeded
04: Rotation
difference error
0D: Lock
0C: Fan lock
P22 P22
Location
of
Description
detection
I/F Activation of
high-pressure
protection
IPDU Outdoor fan IPDU
error
Error detection
System status
condition(s)
All stop Pd sensor detects pressure
equal to or greater than
3.6 MPa.
All stop (Sub code: 08)
FAN IPDU position detection
circuit
Position detection is not
performed properly.
All stop (Sub code: 0A)
FAN IPDU overcurrent
protection circuit
Overcurrent was detected
when the fan started running
or during operation.
All stop (Sub code: 0E)
FAN IPDU position detection
circuit
Position detection is not
performed properly.
All stop (Sub code: 0F)
FAN IPDU position detection
circuit
Position detection is not
performed properly.
All stop (Sub code: 06)
External factors such as blast
Position detection is not
performed properly.
(Restarted in 6 seconds)
All stop (Sub code: 04)
External factors such as blast
The difference between
targeted rotation and actual
rotation is 25% or more.
(Restarted in 6 seconds)
All stop (Sub code: 0D)
FAN IPDU position detection
circuit
Position detection is not
performed properly. (No wind)
All stop (Sub code: 0C)
External factors such as blast
Position detection is not
performed properly. (Wind
blows) (Restarted in 6
seconds)
– 91 –
Check items (locations)
• Check for defect in Pd pressure
sensor.
• Check service valves (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 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 SV5 valve circuit.
• Check for refrigerant overcharging.
• Check the fan motor.
• Check the connector connection for
fan motor.
• Check the error of IPDU board for
fan.
• Check the fan motor.
• Check the error of IPDU board for
fan.
• Check the fan motor.
• Check the connector connection for
fan motor.
• Check the error of IPDU board for
fan.
• Check the fan motor.
• Check the connector connection for
fan motor.
• Check the error of IPDU board for
fan.
• Check the fan motor.
• Check the error of IPDU board for
fan.
• Check the fan motor.
• Check the error of IPDU board for
fan.
• Check the fan motor.
• Check the connector connection for
fan motor.
• Check the error of IPDU board for
fan.
• Check the fan motor.
• Check the error of IPDU board for
fan.