Pfannenberg DTFI 9021 - Manual (Page 15)

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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 cufficiently.
Unit only cools irregularly
Condensate accumulates in
switch cabinet
Condensate fails to drain
Possible cause(s)
Temperature setting too high
Thresholdvalues for usage exceeded.
Lack of coolant
Heat exchanger contaminated.
Fan in internal airflow circuit faulty. Fan in
external airflow circuit faulty.
Air not circulationg properly inside the
switch cabinet
Coding switch incorrectly set or defective.
Blow-out temperature too low
Switch cabinet not sufficiently sealedt.
Condensate drainage clogged.
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 eexhaust into/
from cooling unit into switch cabinet must
be inimpeded.
Check coding switch and cable
connections.
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.
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: (5s, 1s, 1s, 1s) with periodic repetition
(User error)
Status indicator, flashing sequence 2: (1s, 1s) with periodic repetition
(Unit fault)
Status indicator, flashing sequence 3: (1s, 1s, 1s, 1s) with periodic repetition
(Test/start-up mode)