Toshiba HFC R407C Service Manual page 47

Diagnostic procedure for check code
A
Does heating indoor fan
operate normally?
Yes
Are the Multi Controller PMV/
solenoid valves normal?
Yes
Is there any element to block
heat exchange in the room?
(1) Filter blockage
(2) Heat exchanger blockage
(3) Short circuit
No
Is communication line
between indoor and outdoor
units correct?
Yes
Refrigerant overcharge
Blockage
Pipe breakage
Abnormal overload
Troubleshooting
No
No
Are the connector
connection and coil
normal?
Yes
Yes
Eliminate blocking
element
Is there a blockage on
whole valve?
No
Check Multi Controller
PC board.
If defective, replace
No
Check and modify
wiring
Check indoor PC board.
If defective, replace
Are the
connection and fan
motor normal?
Yes
No
Repair defective
position
Yes
Replace PMV unit
Yes
Is the sensor resistance
value characteristic TC
normal?
No
Repair defective
position
No
Replace TC sensor
47