Toshiba MMU-P0121H Service Manual page 80

Check code
[9A]
Miswiring/Misconnection of indoor
Did you stop the outdoor unit
for 20 minutes or more before
checking miswiring?
YES
Did you check
miswiring according to the temp.
conditions (Table 1)?
YES
Is there other check codes?
YES
Check 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?
In cooling : TC1, TC2, TA, Pressure
In heating : TC1, TC2, TA
YES
Is wiring correct?
YES
Blockage or pipe breakage
1. Miswiring/Mispiping of indoor/outdoor units
2. Insufficient refrigerant
3. Blockage in pipe run
Stop the outdoor unit for
NO
20 minutes or more, and
then check miswiring again.
YES
Is "9A" displayed again?
NO
NO
Insufficient refrigerant,
miswiring, 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
4. Blockage in pipe
NO
NO
NO
(Check with miswiring check function of the outdoor unit.)
3-77
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.
Set normal wiring.
Heating miswiring
18 to 32˚C
–10 to 15˚C