4-Way Valve Operation Error - Toshiba Super MMU-AP0091H Service Manual

Check code name
[P19] / [08]
(d07 / AI-NET)
Sub-code: Detected outdoor unit No.
Is 4-way valve coil
connector connected?
YES
Are TS1, TE1, Pd, Ps sensor
connectors connected?
YES
Are characteristics of resistance value
of TS1 and TE1 sensors normal?
YES
Are output voltage characteristics
of Pd and Ps sensors normal?
YES
Are connection and installation
of TE1 and TL sensors correct?
YES
Reset the power supply and
start heating test operation.
Does 4-way valve operate?
NO
4-way valve error
Check code name

4-way valve operation error

NO
NO
NO
NO
NO
Does not discharge
YES
refrigerant gas bypass to
suction side through
4-way valve? *1
Check 4-way valve.
*1 Check TS and TE temperature of the outdoor unit which compressors is operated.
(I/F) SW01=[1], SW02=[6], SW03=[2]
SW01=[1], SW02=[7], SW03=[2]
<Judgment criteria>
TE sensor: Normal if TE
TS sensor: Normal if TS
198
Cause of operation
1. 4-way valve error
2. TS1 sensor/TE1 sensor error
3. Pd sensor/Ps sensor error
4. TE sensor/TL sensor misconnection
NO
YES
TS sensor temperature
TE sensor temperature
20˚C except summer season (Outside temp 20˚C or lower)
40˚C except summer season (Outside temp 20˚C or lower)
Correct connector connection.
(4-way valve coil: CN317)
Correct connector connection.
TS1 sensor: CN504
TE1 sensor: CN505
Pd sensor: CN501
Ps sensor: CN500
Replace sensor.
Replace sensor.
Correct connection
and installation.
If an error did not occur
in test operation,
restart the operation.