Toshiba HWT-602S21SM3W-E(TR) Service Manual page 146

Outdoor LED
Check code
indication
[H04]
[L10]
[L15]
[L29]
(No specific description indicates outdoor unit parts.)
[Case thermostat operation]
<401, 601> CN500
<801, 1101, 1401> CN609 (Including 3 phase)
connector and case thermostat is normal
Yes
If case thermostat is short circuited,
cooling and heating can operate
Yes
No gas leakage
Enough Refrigerant
Yes
Service valve is fully opened
Yes
Pulse motor valve is normal
Yes
Check for piping collapse and break
If defective, repair or replace it
[Unset model type]
Cut jumper line by following the instruction
comes with the service board package
[Combination failure between the hydro unit]
Replace the hydro unit with the proper model
[Communication trouble between MCUs]
Is the communication line between the
• MCC-1705 and the MCC-1675
• MCC-1758 and the MCC-1675
• MCC-1780 and the MCC-1781
connected?
YES
Check outdoor control board
If defective, replace it
145
Check and Action procedure
No
No
No
No
No
NO
PC board
<801, 1101> MCC-1705, MCC-1675
<1401> MCC-1758, MCC-1675
(3 phase)<801,1101,1401> MCC-1780,
MCC-1781
Correct connector
Replace case thermostat
Check outdoor board
If defective, replace it
PC boar
<401,601> MCC-1768
<801,1101> MCC-1705
<1401> MCC-1758
(3 phase)<801,1101,
1401> MCC-1780
Correct defective portion
Re-charge refrigerant
Open fully service valve
Correct defective portion
Replace defective parts
Correct wiring