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Maintenance, troubleshooting, spare parts and dismantling
FAULT
Electronic controller
DMC50 in alarm
condition (status
area red colour) -
See section 8.14.6
46
POSSIBLE REASON – SUGGESTED MEASURE
Status area blinking red : one or more alarms are active. The display shows the ID
code and the description of the active alarm.
Status area steady red : one or more alarms need to be reset. The display shows the
ID code and the description of alarm which is no longer active but which still need to
be reset.
Alarms are shown by following codes and descriptions :
1. High Pressure Switch - HPS pressure switch triggered (refrigerant high pressure)
because the refrigerant pressure is too high – see the corresponding paragraph.
2. Low Pressure Switch - LPS pressure switch triggered (low pressure) because the
refrigerant pressure is too low – see the corresponding paragraph.
3. Fan protection (air-cooled) - At least one of electrical protections of the fan has
triggered or the inverter is in alarm condition or fault - see electric diagram.
Circuit breaker QV1 has tripped - reset circuit breaker, restart and check the perfect
functioning of the dryer.
Internal thermal protection MF1 (and/or MF2 if installed) has tripped - wait 30 minutes,
restart and check the perfect functioning of the dryer.
Inverter INV2 in alarm condition - Refer to the manual of inverter, reset the alarm
condition by acting on the inverter control panel, restart and check the perfect
functioning of the dryer.
Fault Inverter INV2 - Replace the inverter.
4. High Discharge Temperature - The outlet temperature protection of the compressor
has triggered as a result of a very high temperature, over safety limits (probe T4) –
see the corresponding paragraph.
5. Compressor protection - The electrical protection of the compressor has tripped
(see QC1 on the electric diagram) – reset, restart and check the perfect functioning of
the dryer.
6. Ice : The temperature inside the exchanger (probe BT1) is too low – the dew point is
too low – see the corresponding paragraph.
7. Probe Fault LP - Failure pressure transducer BLP - see electric diagram - check the
electric cabling and/or replace the transducer.
8. Probe Fault HP - Failure pressure transducer BHP - see electric diagram - check the
electric cabling and/or replace the transducer.
9. Probe Fault T1 - Failure temperature probe BT1 - see electric diagram - check the
electric cabling and/or replace the probe.
10. Probe Fault T4 - Failure temperature probe BT4 - see electric diagram - check the
electric cabling and/or replace the probe.
11. Low Differential Pressure - Low differential pressure between HP-LP values - see
the corresponding paragraph.
12. High Evaporating Pressure - The evaporating pressure is too high – see the
corresponding paragraph.
13. Low Condensing Pressure - The condensing pressure is too low - see the
corresponding paragraph
1001. Power Unit Communication Fault - Data communication between display and
main module of the controller DMC50 is lost - Check the cable connection between
two modules and / or replace the cable.
1002. Inverter Communication Fault - Data communication between main module of
the controller DMC50 and inverter of the compressor is lost.
Cable data connection broken - Check the cable connection between the two modules
and / or replace the cable.
Fault inverter INV1 - Replace the inverter
1400.
1479
manual of inverter, reset the alarm condition by acting on the inverter control panel,
restart and check the perfect functioning of the dryer.
Specific alarms of inverter of the compressor - Refer to the
DRYPOINT® RA 1300-4400 eco
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Table of Contents
Troubleshooting
