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00U07352260-A_EN
AHP60-50/70 -
Installation, Use and Maintenance
Code
Description
Cause
Solution
E651
Failure of the
external air
sensor
The EXT1 sensor is
defective
• Check that the sensor is securely attached to the
terminals XC-8.1 / XC-8.2
• Check the wiring of the fan fault contact terminals
XC-8.2 and XC-9.1 with terminals 11 and 14.
• Check for the presence of a fan fault.
E691
Low pressure
sensor
failure
The TC1 low pressure
sensor is defective.
• Check that the TC1 sensor is attached correctly to
the terminals XC-15.1 / XC-15.2.
E701
High pressure
sensor
failure
The TR1 high pressure
sensor is defective.
• Check that the TR1 sensor is attached correctly to
the terminals XC-16.1 / XC-16.2.
E801
Inverter board
1 communication
error
• The communication
cable between the
inverter board and
the fan opto-coupler
is not connected or is
defective.
• The opto-coupler
OPT1 is defective or
not powered.
• Check the communication cable between the
control terminals CN15 2-3, opto-coupler OPT1 and
compressor board INV1:
• Check the 12VDC AL1 power supply board
Inverter board for
compressor 1
Coupler
isolator
switch
V415
control
unit
Inverter board for
compressor 2