What To Do If; General Errors; Fault Diagnosis; Pfannenberg Units With Multi-Controller - Pfannenberg DTS 6 01-Serie Betriebs- Und Montageanleitung

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13 What to do if ...

... in spite of your care and attention a fault occurs?
Check the following points first. If the fault is not then cleared, call an authorized specialist.

13.1 General errors

- No message via the service indicator
Fault
Unit fails to cool,
fan in an internal airflow circuit
is running.
Unit fails to cool sufficiently.
Unit only cools irregularly
Condensate accumulates in
switch cabinet.
Condensate fails to drain.
Condensate runs out of the unit The condensate evaporator is defective or too much

13.2 Fault diagnosis

- Message via the service indicator
If a fault occurs in the cooling unit, the status indicator goes over to flashing mode which in conjunction with the unit characteristics is to make
initial fault diagnosis easier.
Flashing sequences in the fault mode can be:
Status indicator, flashing sequence 1:
(User error)
Status indicator, flashing sequence 2:
(Unit fault)
Status indicator, flashing sequence 3:
(Test/start-up mode)

13.3 Pfannenberg units with Multi-Controller

When using a unit with Multi-Controller, the fault indication is given in the form of an error code on the temperature display. To classify the
error code, refer to the „Operating Instructions Temperature display unit" provided with the documentation for the unit.
Hint:
The legibility of the display may be limited due to electromagnetic disturbances.
085 408 121a
Possible cause(s)
Temperature setting too high.
Threshold values for usage exceeded.
Lack of coolant.
Heat exchanger contaminated.
Fan in internal airflow circuit faulty. Fan in external
airflow circuit faulty.
Air not circulating properly inside the switch cabinet.
Coding switch incorrectly set or defective.
Blow-out temperature too low.
Switch cabinet not sufficiently sealed.
Condensate drainage clogged.
condensate accumulates.
Switch cabinet not sufficiently sealed.
Remedy
Check temperature setting.
Check ambient temperature and internal load.
Call authorized specialist, check unit for leaks.
Clean heat exchanger.
Call authorized specialist, replace fan.
Check assemblies and air circulation inside switch cabinet.
Air intake and exhaust into/from cooling unit into switch
cabinet must be unimpeded.
Set higher temperature at thermostat.
Close switch cabinet door.
Remedy leakage at switch cabinet.
Clean condensate drainage. Condensate drainage hose
must be inclined downward without showing a bend.
Replace the fuses for the condensate evaporator.
Remedy leakage at switch cabinet.
(5s, 1s, 1s, 1s) with periodic repetition
(1s, 1s) with periodic repetition
(1s, 1s, 1s, 1s) with periodic repetition
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