Toshiba MMF-AP0156H-E (TR) Service Manual Download

Page: 73 / 97

– 73 –

Check code

Location

detection

Description

System status

Error detection

condition(s)

Check items (locations)

Outdoor 7-segment display

Check

code

Sub-code

Main

remote

controller

P12

—

Indoor unit Indoor fan motor

error

Stop of
corresponding unit

• Motor speed measurements
continuously deviate from
target value.
• Overcurrent protection is
activated.

• Check connection of fan connector
and wiring.
• Check for defect in fan motor.
• Check for defect in indoor P.C.
board.
• Check impact of outside air
treatment (OA).
• Check static pressure setting.

P13

—

P13

I/F

Outdoor liquid
backflow detection
error

All stop

<During cooling operation>
When system is in cooling
operation, high pressure is
detected in follower unit that
has been turned off.
<During heating operation>
When system is in heating
operation, outdoor PMV 1 or
2 continuously registers
opening of 100p or less while
under SH control.

• Check full-close operation of
outdoor PMV (1, 2, 4).
• Check for defect in Pd or Ps sensor.
• Check gas balancing circuit (SV2)
for clogging.
• Check balance pipe.
• Check SV3B circuit for clogging.
• Check defect in outdoor P.C. board
(I/F).
• Check capillary of oil separator oil
return circuit for clogging.
• Check for leakage of check valve in
discharge pipe convergent section.

P15

01: TS condition

P15

I/F

Gas leakdetection
(TS1 condition)

All stop

Protective shutdown due to
sustained suction
temperature at or above
judgment criterion
for at least 10 minutes is
repeated four times or more.
<TS error judgment criterion>
In cooling operation: 60 ˚C
In heating operation: 40 ˚C

• Check for insufficiency in
refrigerant quantity.
• Check outdoor service valves (gas
side, liquid side) to confirm full
opening.
• Check PMVs (PMV1, 2) for
clogging.
• Check resistance characteristics of
TS1 sensor.
• Check for defect in 4-way valve.
• Check SV4 circuit for leakage

P17

—

P17

I/F

Discharge
temperature TD2
error

All stop

Discharge temperature (TD2)
exceeds 115 ˚C.

• Check outdoor service valves (gas
side, liquid side) to confirm full
opening.
• Check outdoor PMVs (PMV1, 2, 4)
for clogging.
• Check resistance characteristics of
TD2 sensor.
• Check for defect in 4-way valve.
• Check SV4 circuit for leakage.
• Check SV4 circuit (for wiring or
installation error involving SV41,
SV42 and SV43).

P18

—

P18

I/F

Discharge
temperature TD3
error

All stop

Discharge temperature (TD3)
exceeds 115 ˚C.

• Check outdoor service valves (gas
side, liquid side) to confirm full
opening.
• Check outdoor PMVs (PMV1, 2, 4)
for clogging.
• Check resistance characteristics of
TD3 sensor.
• Check for defect in 4-way valve.
• Check SV43 circuit for leakage.
• Check SV4 circuit (for wiring or
installation error involving SV41,
SV42 and SV43).

P19

Detected
outdoor unit No.

P19

I/F

4-way valve
reversing error

All stop

Abnormal refrigerating cycle
data is collected during
heating operation.

• Check for defect in main body of
4-way valve.
• Check for coil defect in 4-way valve
and loose connection of its
connector.
• Check resistance characteristics of
TS1 and TE1 sensors.
• Check output voltage
characteristics of Pd and Ps
pressure sensors.
• Check for wiring error involving TE1
and TL sensors.

02: TD condition I/F

Gas leak detection
(TD condition)

All stop

Protective shutdown due to
sustained discharge
temperature (TD1, TD2 or
TD3) at or above 108 ˚C for
at least 10 minutes is repeated
four times or more.

• Check for insufficiency in
refrigerant quantity.
• Check PMVs (PMV 1, 2) for
clogging.
• Check resistance characteristics of
TD1, TD2 and TD3 sensors.
• Check indoor filter for clogging.
• Check piping for clogging.
• Check SV4 circuit (for leakage or
coil installation error).