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00U07352260-A_EN
AHP60-50/70 -
Installation, Use and Maintenance
Code
Description
Cause
Solution
E802
(*)
continued
Inverter board
2 communication
error
• The communication
cable between the
inverter board and
the opto-coupler is
not connected or is
defective.
• The opto-coupler
OPT1 is defective or
not powered.
If the functional diagram connections are all present,
Check:
• Check if opto-coupler OPT1 is powered, if there is a
12V voltage between the VCC and GND terminals.
• 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 INV2 are not flashing and the board is
powered, the INV2 board needs to be replaced.
E851
(*)
Problem on
inverter board
Inverter board or
compressor defective.
Poor connection
between the inverter
board and the
compressor.
Check the continuity of the connection between U, V and
W on the inverter board and U, V, W on the compressor.
Change the inverter board.
Check the resistor between the compressor phases:
If it is different from the previous values, replace the
compressor:
• Check the number of times the inverter board LED
flashes.
E852
Problem on
inverter board
Inverter board or
compressor defective.
Poor connection
between the inverter
board and the
compressor.
Check the continuity of the connection between U, V and
W on the inverter board and U, V, W on the compressor.
Change the inverter board.
Check the resistor between the compressor phases:
If it is different from the previous values, replace the
compressor:
• Check the number of times the inverter board LED
flashes.
Models
Resistance of coil at 20°C
50 kW
0.23 ohm
70 kW
0.16 ohm
Models
Resistance of coil at 20°C
50 kW
0.23 ohm
70 kW
0.16 ohm