Toshiba Super MMY-MAP0801HT7 - Actuation of High-Pressure SW

189
Check code name
[P04] / [21]
(d07 / AI-NET)
Check code name
Actuation of high-pressure SW
Cause of operation
1. High-pressure SW error
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
Sub-code: 01: Compressor 1 side 02: Compressor 2 side Note) High-pressure SW is normally closed.
(B contact)
( )
Coil error, clogging,
disconnection of wiring, etc.
Cooling
To B
Heating
To C
Does high-pressure SW operate?
Are parts of high-pressure SW normal?
Is service valve fully opened?
B Cooling operation
Is SV2 circuit normal?
Open service valve fully.
Replace the high-pressure sensor.
Repair faulty parts.
Eliminate the interfered causes.
Repair SV2 circuit.
Is circuit cabling normal? Check and correct cabling.
Does cooling outdoor fan
normally operate?
Is there no crack or
coming-off of fan?
Are characteristics of
high-pressure sensor normal?
Reset power supply, and start a test
operation corresponded to the season.
Check parts.
Failure
Replace
Check I/F P.C. board.
Failure
Replace
Connector connection,
fan IPDU, fan motor, wiring
Is there a cause to interfere operation
of heat exchanger of outdoor unit?
1. Heat exchanger clogging
2. Air short circuit
A
YES
YES
YES
YES
YES YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
NO