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KBF-S / KBF-S-UL (E6) 02/2019 page 70/91
23. Troubleshooting
Fault description
Possible cause
Required measures
General
Chamber without function.
No power supply.
Check connection to power sup-
ply.
Wrong voltage.
Check power supply for correct
voltage (chap. 4.3).
Chamber fuse has responded.
Check chamber fuse and replace
it if appropriate. If it responds
again, contact BINDER service.
Controller defective.
Contact BINDER service.
Nominal temperature exceeded
by 10°C due to chamber failure.
Over temperature protective de-
vice (class 1) responds.
Heating
Chamber heating permanently,
set-point not maintained.
Controller defective.
Contact BINDER service.
Semiconductor relay defective.
Controller not well adjusted, or
adjustment interval exceeded.
Calibrate and adjust controller.
Chamber doesn’t heat up.
Pt 100 sensor defective.
Contact BINDER service.
Heating element defective.
Semiconductor relay defective
Chamber doesn’t heat up when
turned on.
Safety controller responds.
Inner chamber temperature has
reached the safety controller val-
ue. Safety controller set too low.
Acknowledge the alarm on the
controller. Check temperature
setpoint setting. If appropriate,
select suitable safety controller
value (chap. 10.2).
Safety controller (chap. 10.2)
defective.
Contact BINDER service.
Refrigerating performance
Low or no refrigerating perfor-
mance.
Ambient temperature above
25 °C / 77 °F (chap.3.4).
Select cooler place of installation.
Combination of tempera-
ture/humidity values not in the
optimum range (see temperature
humidity diagram, Figure 19).
Select combination of tempera-
ture/humidity values in the opti-
mum range (chap. 18).
Compressor not turned on.
Contact BINDER service.
Electro-valves defective.
No or not enough refrigerant.
Too much external heat load.
Reduce heat load.
Humidity
Humidity fluctuation:
Control accuracy of +/- 3 % r.h. is
not reached.
Door gasket defective.
Replace door gasket.
Door opened very frequently. Open doors less frequently.
Humidity fluctuation, together with
temperature fluctuation > 1 °C
with a set-point approx. 3 °C
above ambient temperature.
Place of installation too hot.
Select cooler place of installation
or contact BINDER service.
No or low dehumidification.
Capillary tube blocked
Contact BINDER service.
Not enough refrigerant.
Humidity control turned off.
Turn on humidity control (chap.
8).
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