Toshiba MMU-P0121H Service Manual page 101

Check code
[E5]
Inverter IOL operation
Is IOL circuit normal?
1. Connector
2. Wiring
3. Outdoor P.C. board
YES
Are gas pipe, liquid pipe,
and service valve of the outdoor unit
fully open?
YES
Are outdoor PMV A
and PMV B normal?
1. Connector connection
2. Wiring 3. Coil
4. Valve unit
5. Outdoor P.C. board
YES
Is wiring correct?
YES
Insufficient refrigerant,
blockage, pipe breakage
1. Inverter IOL operation
2. Service valve closed
3. Outdoor PMV A error or cooling bypass PMV B error
4. Miswiring of communication between indoor and outdoor unit
NO
NO
NO
NO
(Check miswiring of the outdoor unit according to miswiring check function.)
Check there is no blockage or pipe breakage, and then add
(
refrigerant according to judgment of refrigerant amount.
3-98
Operation cause
Repair IOL circuit.
Open service valve fully.
Repair outdoor PMV.
Set normal wiring.
)