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00U07352260-A_EN
AHP60-50/70 -
Installation, Use and Maintenance
Code
Description
Cause
Solution
E020
Inverter pressure
sensor error
If the compressor has
been operating for more
than 150 seconds, if the
low pressure sensor
detects that the pressure
is higher than the high
pressure sensor, then
the alarm message
E020 is displayed.
This alarm is not reset
(the machine has to be
powered down to clear
the alarm).
• Check that the pressure sensor wiring is not inverted
• Check that the compressor inverter board is operating
correctly.
• Check the compressor is operating correctly
• Check the continuity of the connection between U, V
and W on the inverter and U, V, W on the compressor.
• Check the resistor between the compressor phases:
E611
Failure of the
water inlet sensor
The IE1 sensor is defective.
• Check that the IE1 sensor is securely attached to the
terminals XC-4.1 / XC-4.2.
E621
Failure of the
water outlet
sensor
The OE1 sensor is
defective.
• Check that the OE1 sensor is securely attached to
the terminals XC-5.1 / XC-5.2.
E631
Suction sensor
failure
sensor
failure
The SD1 sensor is
defective.
• Check that the SD1 sensor is securely attached to
the terminals XC-6.1 / XC-6.2.
Models
Resistance of coil at 20°C
50 kW
0.23 ohm
70 kW
0.16 ohm