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00U07352240-A_ EN
AHP60 14/18 kW -
Installation, Use and Maintenance
Code Description
Cause
Solution
E801
(*)
continued
Inverter
board
communication
error
• The communication cable
between the inverter board
and the fan boards is not
connected or is defective.
• The opto-coupler OPT1 is
defective or not powered.
• Check the fan fuse
If the functional diagram connections are all present,
Check:
• Check if opto-coupler OPT1 is powered, if there is a
12V voltage between the terminals Vcc and GND.
• Bypass the opto-coupler separating the
compressor board and the fan board to
determine if the opto-coupler is working. :
• If the LEDs of the compressor inverter
board INV1 are not flashing and the board is
powered, the board INV1 needs to be changed.