OCH790 _66
6602 (A2): Transmission processor hardware error
Abnormal points and detection methods
The transmission line shows “1” although the transmission
processor transmitted “0”.
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 pro-
cessor
•
Noise interference on indoor/outdoor connectors
Diagnosis of failure
If the wiring work was performed while the power
was ON, turn the power OFF of indoor/outdoor
unit, Fresh Master or Lossnay simultaneously for
2 minutes or more, then turn the power back ON.
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).
Turn the power back ON.
A wiring work was performed while the
power was OFF.
Does it operate normally?
No
Yes
Yes
No
