Toshiba MMU-P0121H Service Manual page 100

C
Does heating indoor fan
operate normally?
YES
Is indoor PMV normal?
YES
Is there any
element to block heat
exchange in the room?
Q
R
Filter blockage
S
Heat exchanger blockage
Short circuit
NO
Is communication line
between indoor and
outdoor units correct?
YES
Refrigerant overcharge
Blockage
Pipe breakage
Abnormal overload
NO
NO
Are connector connection
and coil normal?
YES
YES
Eliminate blocking
element.
Is there blockage
on whole valve?
NO
NO
Check and
modify wiring.
Check indoor P.C. board.
Defective
3-97
Are connector
connection and outdoor
fan motor normal?
NO
Repair defective
position.
YES
Replace
PMV unit.
Is sensor resistance
YES
value characteristic
TC2 normal?
®
Replacement
NO
YES
Repair defective
position.
NO
Replace
TC2 sensor.