01-07-2022
55 / 74
AHP60
26/32 kW -
Installation, Use and Maintenance
Code Description
Cause
Solution
E651
Outdoor
air sensor
failure or
fan error
The EXT1 sensor is
defective or the fan fault
relay is switched
• Check that the sensor is securely attached to the
terminals XC-10.1 / XC-10.2
• Check the COM and NO terminal fan fault cabling
• Check the power supply to the L1 / L2 / L3 terminal fan
E691
Low
pressure
sensor
failure
The LP1 low pressure
sensor is defective
• Check that the LP1 sensor is attached correctly to
the terminals XC-17.1 / XC-17.2
E701
High
pressure
sensor
failure
The HP1 high pressure
sensor is defective
• Check that the HP1 sensor is attached correctly to
the terminals XC-18.1 / XC-18.2
E801
(*)
Inverter
board
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
• Check the fuse on the fan
board
• Check the communication cable between the
command terminals CN15 2-3, opto-coupler
OPT1 (see electrical diagram), fan board FD1 and
compressor board INV1:
Inverter
compressor
Coupler
isolator
switch
V415
control
unit
