Pfannenberg DTS 6201C - 6 Troubleshooting

Operating Manual DTS and DTI 6201C / 6301C Multi-Controller (MC) 086100014 © Pfannenberg GmbH Page 41 / 43
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6 Troubleshooting
Fault
Possible causes
Corrective measures
Unit does not cool;
Evaporator fan
(internal) running
• Temperature setting too high.
 Check the temperature setting.
Unit does not cool
sufficiently
• Operating limits exceeded.
 Check the ambient temperature and internal
load.
• Too little coolant.
 Call in authorized qualified personnel; check
the unit for leakage.
• Heat exchanger dirty.
 Clean the heat exchanger.
• Evaporator fan (internal) defective.
• Condenser fan (external) defective.
 Call in authorized, qualified personnel;
replace fan.
• Disruption in the air circulation
inside the cabinet.
 Check the installation and the path of air
circulating in the switch cabinet.
 Check the supply and outlet flow of air of
the cooling unit to the inlet and outlet
opening of the switch cabinet.
Unit cools only
periodically
• Temperature set incorrectly or unit
is defective.
 Set the a higher temperature.
 Call in authorized qualified personnel, check
the unit.
Condensate
accumulates in the
switch cabinet
• Exhaust temperature is too low.
 Close the cabinet door.
• Switch cabinet is not sufficiently
sealed.
 Correct leaky points or seals on the switch
cabinet.
 Check the temperature setting.
Condensate does not
drain
• Condensate drain is plugged up.
 Clean the condensate drain.
 Check whether the condensate drain hose
is free from kinks and is installed with a
downward slope.
Condensate drains from
the unit
• Condensate evaporator is defective
or too much condensate
accumulates.
 Replace fuses for the condensate
evaporator.
• Switch cabinet is not sufficiently
sealed.
 Correct leaky points or seals on the switch
cabinet.
 The blinking of the red LED light on the controller circuit board is not a fault indicator or error message. The red
LED lamp indicates that voltage is supplied to the cooling unit.