Check code name

Check code name

 

Cause of operation

 

 

 

[P04]

Actuation of

1. High-pressure SW error

 

high-pressure SW

2. Service valve closed

 

 

3.

Pd sensor error

 

 

4.

Indoor/outdoor fan error

 

 

5.

Indoor/outdoor PMV choke

 

 

6.

Indoor/outdoor heat exchanger clogging, air short circuit

 

 

7.

SV2 circuit error

 

 

8.

SV4 circuit error

 

 

9.

SV5 circuit error

 

 

10. Discharge line check valve malfunction

 

 

11. Refrigerant overcharge

 

 

 

 

 

A

 

 

 

 

 

 

 

 

C All heating operation

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Is SV4 circuit normal?

 

NO

 

Repair SV4 circuit.

 

 

 

 

 

 

 

 

Coil error, clogging,

 

 

 

 

 

 

 

 

 

 

 

 

 

YES

 

 

 

( disconnection of wiring, etc. )

 

 

 

 

 

 

 

 

 

All heating operation

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Refrigerant overcharge,

 

 

 

 

 

 

 

 

 

 

 

clogging,pipe breakage,

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

abnormal overload condition

 

 

 

 

 

YES

Does heating indoor fan

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

normally operate?

 

 

 

 

 

 

 

 

NO

Is connector

NO

 

NO

 

 

 

 

Is indoor

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

connection,

 

 

 

 

 

 

PMV normal?

 

 

 

 

 

 

 

 

 

 

coil normal?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

YES

 

 

 

 

 

 

Auxiliary code : Compressor 1 side

02: Compressor 2 side

Note)

 

 

 

NO

 

Does high-pressure SW operate?

 

 

Is circuit cabling normal?

 

 

 

YES

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

High-pressure SW is normally closed. (B contact)

NO

Check and correct cabling.

Check I/F P.C. board.

Failure Replace

 

 

 

YES

 

 

 

Is there a cause to

 

Repair

 

 

 

 

 

faulty parts.

 

 

YES

 

interfere operation of

 

 

 

 

 

 

 

 

indoor heat exchanger?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

Air filter clogging

 

 

 

 

 

2

Heat exchanger clogging

 

Are connector connection,

NO

 

3

Air short circuit

 

 

 

heat exchanger, fan, and

 

 

 

 

 

 

 

 

NO

 

fan motor normal?

 

 

 

 

 

 

 

82

Are parts of high-pressure SW normal?

YES

Is service valve fully opened?

YES

Check mispiping of

discharge/suction gas main pipes.

Normal

Check operation of PMV3 SV12 valve.

Normal

Is the flow selector normal?

Normal

Reset power supply, and start a test operation corresponded to the season.

Are characteristics of

high-pressure sensor normal?

B All cooling operation

Does cooling outdoor fan normally operate?

YES

NO

NO

Abnormal

Abnormal

Abnormal

All cooling operation

To

B

All heating operation

To

C

NO

Is there no crack or

NO

 

 

 

coming-off of fan?

 

 

 

YES

 

 

 

 

Check parts.

Failure Replace

Open service valve fully.

Correct piping.

Replace defective parts.

Repair the flow selector unit.

Replace the high-pressure sensor.

Repair faulty parts.

Connector connection,

fan IPDU, fan motor, wiring

Eliminate the

 

 

 

 

 

 

 

 

YES

 

 

 

interfered causes.

 

 

 

 

 

 

 

 

 

 

 

 

Repair

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

faulty parts.

 

NO

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Is 4-way valve normal?

 

 

 

 

Are characteristics of TC2 NO

 

 

 

 

 

 

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

and TCJ sensor resistance

 

 

Replace 4-way valve.

 

 

 

 

 

 

 

 

 

value normal?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

YES

 

 

 

 

 

 

NO

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Replace TC2

 

 

Is SV11 circuit normal?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

or TCJ sensor.

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

Repair faulty position.

 

NO

 

 

 

 

 

 

 

 

Is there clogging

 

 

 

 

 

 

 

Check indoor P.C. board.

 

 

 

 

 

 

 

of valve?

 

 

 

 

Failure Replace

 

 

 

 

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NO Are not indoor units of different

 

 

 

 

 

 

 

 

Replace PMV body.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

refrigerant circuit connected?

 

 

 

 

 

 

 

 

 

 

 

 

 

YES

 

Check with miscabling check

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

( function of outdoor unit.

)

 

 

 

 

 

 

 

 

 

Check and

 

Refrigerant overcharge, clogging,

correct the cabling.

 

 

 

 

 

 

 

 

 

pipe breakage, abnormal overload condition

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Is there a cause to interfere operation

YES

of heat exchanger of outdoor unit?

 

1.Heat exchanger clogging

2.Air short circuit

NO

NO

Is SV2 circuit normal?

YES

A

Eliminate the interfered causes.

Repair SV2 circuit.

( Coil error, clogging, ) disconnection of wiring, etc.

Check code name

Check code name

Cause of operation

 

[P05]

Open phase, negative phase

1.

Power supply open phase

 

 

 

2.

Power supply negative phase

 

 

 

 

 

 

 

 

• Check the phase power line of outdoor unit.

 

 

•

Check error of outdoor I/F P.C. board.

 

 

•

Check there is no looseness, etc of terminal.

 

 

 

 

 

 

 

Page 81 Page 83
Page 82
Image 82
Toshiba MMU-AP0091MH P04 Actuation, P05 Open phase, negative phase, High-pressure SW, Auxiliary code Compressor 1 side
Page 81 Page 83

MMU-AP0181MH, MMU-AP0071MH, MMU-AP0091MH, MMU-AP0151MH, MMU-AP0121MH specifications

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