Toshiba MCY-MHP0404HS-E Service Manual page 114

Check code
Outdoor 7-segment display
Main
remote
Check
Sub-code
controller
code
P04 P04
AMP Air Conditioning
Location
of Description System status
detection
IPDU Activation of All stop
high-pressure
SW
Check code detection
condition(s)
High-pressure SW is
activated.
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Check items (locations)
Check connection of
high-pressure SW
connector.
Check for trouble in PD
pressure sensor.
Check outdoor 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 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 error.
Check for faulty operation
of check valve in
discharge pipe conver-
gent section.
Check gas balancing SV4
valve circuit.
Check SV5 valve circuit.
Check for refrigerant
overcharging.