Check code
6602
(A2)
Abnormal points and detection methods
If the transmission line shows "1" although the transmission processor
transmitted "0".
●Diagnosis of defects
Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.
A wiring work was performed
while the power OFF.
Turn the power back ON.
Does it operate normally?
OCH675D
Transmission processor hardware error
Diagnosis
Yes
Yes
Causes and checkpoints
A transmitting data collision occurred because of a
wiring work or polarity change has performed while
the power is ON on either of the indoor/outdoor unit,
Fresh Master or Lossnay
Malfunction of transmitting circuit on transmission
processor
Noise interference on indoor/outdoor connectors
If the wiring work was performed while the
power ON, turn the power OFF of indoor/
No
outdoor unit, Fresh Master or Lossnay
simultaneously for 2 minutes or more, then
turn the power back ON.
No
Replace the indoor/outdoor controller board.
There is no abnormality on the AC unit.
It might be caused by an external noise, so
check the transmission line to remove the
factor(s).
74
Remedy