Matrix 0850 - Air Conditioning Unit Alarm Codes

0850/0850-T1 User Manual
Matrix Machine Tool (Coventry) Limited 229 / 231
Edition: 08/2013
23.5 Air conditioning unit alarm codes
Display
Screen
System message
Possible cause
Measures to rectify the Fault
A01
Enclosure door open.
Door Open or door limit switch
Incorrectly positioned.
Close door, position door limit switch correctly,
check connection if necessary.
A02
Enclosure interior
Temperature too high.
Cooling capacity too low /
Unit under dimensioned.
Error as a consequence of messages A03 to
A17.
Check Cooling Capacity.
A03
Filter Monitoring
Filter mat soiled
Clean or exchange;
Reset the comfort controller.
A04
Ambient temperature too
High / too Low.
Ambient temperature outside
Of admissible operating range
(+10`C to +60`C).
Increase or lower the ambient temperature
(e.g. heat or ventilate room)
A05
Icing Hazard
Operational display in case of
Icing hazard.
Evaporator fan may be mechanically
Blocked or defective.
Set the enclosure interior temperature higher.
Check the evaporator fan; release or exchange
If necessary.
A06
PSA pressure-operated
Switch.
Ambient Temperature to high
Lower the ambient temperature;
Reset the comfort controller
Condenser soiled
Clean the condenser;
Reset the comfort controller.
Filter mat soiled
Clean or exchange;
Reset the comfort controller.
E-Valve defective
Repair by refrigeration engineer;
Reset the comfort controller.
PSA pressure-operated switch defective.
Exchange by refrigeration engineer.
Reset the comfort controller.
A07
Evaporator coil
Lack of coolant; sensor in front of or behind
Condenser defective.
Repair by refrigeration engineer;
Reset the comfort controller.
A08
Condensate warning
Condensate discharge kinked or blocked.
Check condensate discharge; remove any
Kinks or blockages in the hose.
Only in units with optional
Condensate evaporation.
Check the evaporation unit, exchange if
Necessary.
A09
Condenser fan
Blocked or defective
Clear the blockage; exchange if necessary.
A10
Evaporator fan
Blocked or defective
Clear the blockage; exchange if necessary.
A11
Compressor
Compressor overload
(inner winding protection)
No action required;
Unit switches on again independently
Defective
(check by measuring the winding resistance)
Exchange by refrigeration engineer.
A12
Condenser temperature
Sensor
Open or short circuit
Replace
A13
Ambient temperature
sensor
Open or short circuit
Replace
A14
Temperature sensor
Icing
Open or short circuit
Replace
A15
Temperature sensor
Condensate warning
Open or short circuit
Replace
A16
Temperature sensor
Internal temperature
Open or short circuit
Replace
A17
Phase monitoring
For three-phase devices only:
Incorrect rotary field/phase absent.
Exchange two phases.
A18
EPROM error
New board obstructed
Software update needed (only following board
Installation with more recent software); enter
The programming level with code 22;
Press button 1 and confirm with “Set” until
“Acc” appears. Then disconnect the unit from
The mains and re-connect.
A19
LAN, Master – Slave
Master and slave not linked
Check setting and/or cable
A20
Voltage drop
Error display not shown
Result is stored in the log file.
E0
Display message
Connection problem between display
And controller board.
Reset: Switch power supply off, then switch on
Again after approx 2 sec.
Cable defective; connection loose.
Exchange the Boards.