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[H04] [Case thermostat operation]
[L10] [Unset model type]
[L15] [Combination failure between the hydro unit]
[L29] [Communication trouble between MCUs]
Check code
Outdoor LED
indication
Check and Action procedure
(No specific description indicates outdoor unit parts.)
<401, 601> CN500, <801, 1101> CN609
connector and case thermostat is normal
Correct connector
Replace case thermostat
Check for piping collapse and break
If defective, repair or replace it
No
Yes
If case thermostat is short circuited,
cooling and heating can operate
Check outdoor board
If defective, replace it
No
Yes
No gas leakage
Enough Refrigerant
Correct defective portion
Re-charge refrigerant
No
Yes
Service valve is fully opened
Open fully service valve
No
Yes
Pulse motor valve is normal
Correct defective portion
Replace defective parts
No
Yes
PC board
<401, 601> MCC-1768
<801, 1101> MCC-1705
Cut jumper line by following the instruction
comes with the service board package
Replace the hydro unit with the proper model
Is the communication line between the
MCC-1705 (CN805) and the
MCC-1675 (CN805) connected?
NO
Correct wiring
YES
Check outdoor control board
If defective, replace it
PC board
MCC-1705, MCC-1675
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