01.07.2022
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AHP60-50/70 -
Installation, Use and Maintenance
Code
Description
Cause
Solution
E641
Failure of the
compressor
dischargesensor
1
/ intervention of
the manual reset
pressure switch
(closed 42.8/bar
open 34bar)
The DT1 sensor is faulty
or the command chain is
open
• Check that compressor discharge sensor DT1 or the
NO contact of the Kinv1 switch are connected to the
terminals XC -7.1/XC-7.2 correctly
• Check the Kinv1 switch is working correctly:
If there is no voltage at the 1-A2 switch coil, check the
safety devices connected in series to it:
- PSH1 automatic reset pressure switch
- Thermostat positioned at top of *compressor TS1
Intervention/reset temperatures TS1
E642
Failure of the
compressor
dischargesensor
2
/ intervention of
the manual reset
pressure switch
(closed 42.8/bar
open 34bar)
The DT2 sensor is faulty
or the command chain is
open
• Check that compressor discharge sensor DT2 or the
NO contact of the Kinv2 switch are connected to the
terminals XC-10.1/XC-10.2 correctly.
• Check the Kinv2 switch is working correctly:
If there is no voltage at the 1-A2 switch coil, check the
safety devices connected in series to it:
- PSH1 automatic reset pressure switch
- Thermostat positioned at top of compressor TS2
Intervention/reset temperatures TS2
Closing temperature
Opening temperature
90 ± 5
120 ± 4
90 ± 5
120 ± 4
Closing temperature
Opening temperature
90 ± 5
120 ± 4
90 ± 5
120 ± 4