Toshiba MM-A0280HT Service Manual page 74

Diagnostic Procedure for Check Code
Check code
[9A]
Miswiring/Misconnection of indoor
Was the outdoor unit stopped
for 20 minutes or more before
checking miswiring?
Yes
Did you check
miswiring according to the temp.
conditions Table 1?
Yes
Are there any other check codes?
Yes
Investigate the check code.
Remove the cause, and
check miswiring again.
Check code
[9F]
Indoor PMV blockage
Is indoor PMV normal?
1. Connector connection
2. Wiring
3. Coil
4. Valve
5. Indoor P .C. board
Yes
Are the following sensors
normal? TC1, TC2,
TA, Pressure
Yes
Is wiring correct?
Yes (Check with miswiring check function of the outdoor unit.)
Blockage or pipe breakage.
Troubleshooting
1. Miswiring/Mispiping of indoor/outdoor units
2. Insufficient refrigerant
3. Blockage in pipe run
No Stop the outdoor unit for
20 minutes or more, and then
check miswiring again.
Yes
Is 9A displayed again?
No
No
Insufficient refrigerant,
miswiring or blockage
1. Indoor unit PMV connection error/main unit error
2. TC1 sensor/TC2 sensor/TA sensor error
3. Miswiring/Mispiping between indoor and outdoor
units
4. Blockage in pipe
No
No
No
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Operation cause
No
Wiring is correct.
Check miswiring according
to conditions in Table 1.
Table 1 Cooling miswiring
Indoor 18 to 32°C
Outdoor 15 to 43°C
Operation cause
Repair indoor PMV.
Replace defective sensor.
Modify wiring.
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