Toshiba MCY-MUG0401HSW-E Service Manual page 180

Check code
Outdoor 7-segment display
Controller
Check
Sub-code
code
P04 P04 1*
00: Power
detection
trouble
01: Open
P05 P05
phase
1*
P07 P07 1*
Detected
P10 P10
indoor address
P11 — —
Location of
Description
detection
Activation of
I/F high-pressure
SW
Power detection
I/F trouble / Open
phase detection
Compressor Compressor
P.C. board Vdc trouble
Heat sink
Compressor
overheating
P.C. board
trouble
Indoor overflow
Indoor unit
trouble
Outdoor heat
I/F exchanger
freeze trouble
Check code detection
System status
condition(s)
High-pressure SW is
All stop
activated.
• Open phase is detected
All stop
when power is turned on.
• Inverter DC voltage is too
All stop high (over voltage) or too
low (under voltage).
Temperature sensor built
All stop into IPM (TH) is
overheated.
• Float switch operates.
• Float switch circuit is
All stop
open-circuited or
disconnected at connector.
Abnormal frost formation
on outdoor heat exchanger
All stop
is detected repeatedly
during heating operation.
179
Check items (locations)
• Check connection of high-
pressure SW connector.
• Check for failure in Pd pressure
sensor.
• Check outdoor service valves
(gas side, liquid side) to confirm
full opening.
• Check for failure in outdoor fan.
• Check for failure in outdoor fan
motor.
• Check outdoor PMV for clogging.
• Check indoor/outdoor heat
exchangers for clogging.
• Check for short-circuiting of
outdoor suction/discharge air
flows.
• Check for failure 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 failure operation of
check valve in discharge pipe
convergent section.
• Check gas balancing SV4 valve
circuit.
• Check for refrigerant
overcharging.
• Check for failure in outdoor P.C.
board (I/F).
• Check wiring of outdoor power
supply.
• Check power supply voltage.
• Check outdoor fan system
trouble.
• Check IPM and heat sink for
thermal performance for failure
installation. (e.g. mounting
screws and thermal conductivity)
• Check for failure in Compressor
P.C. board. (failure IPM built-in
temperature sensor (TH))
• Check float switch connector.
• Check operation of drain pump.
• Check drain pump circuit.
• Check drain pipe for clogging.
• Check for failure in indoor P.C.
board.
• Check shortage of refrigerant.
• Check connection of TE sensor.
• Check resistance characteristics
of TE sensors.
• Check disconnection of TS1
sensor.
• Check resistance characteristics
of TS1 sensor.
• Check outdoor I/F P.C. board
malfunction.
• Check operation of 4 way valve.
• Check operation of outdoor
PMV.
• Check short circuit from outlet air
to inlet air.