Operating and Maintenance Instructions - Chiller - Series EB 210 - EB 440
© Pfannenberg GmbH
Page 43 / 50
EN
Troubleshooting tips
Symtoms
Possible cause
Proposed remedy
The unit does not
start
No supply voltage
Check the supply main voltage line
Broken controller
Inspect the connection, verify the auxiliary
circuit fuses and, if there is no fault, replace
the controller
Unit works, but does
not cool
Lack of refrigerant
Service by a refrigeration engineer
Faulty thermostatic valve
Service by a refrigeration engineer
Too much heat load or too high
ambient temperature
Possible wrong application, to be checked
with our staff
Controller malfunction
Check and correct the parameter settings
Not correct flow rate on hydraulic
circuit
Verify the regulation of hydraulic bypass
where installed
Fluid temperature too
low
Broken controller (contact blocked)
Replace the controller
Wrong set-point
Change cooling setpoint (
Controller
manual
)
Fluid temperature too
high
Broken controller
Replace the controller
Wrong set-point
Change cooling setpoint (
Controller
manual
)
Lack of refrigerant
Please ask for the service by a refrigeration
engineer
TD function active (set-point
temperature follows the ambient
temperature)
Deactivate the TD function if not required
(
Controller manual
)
Too much heat load
Possible wrong application, to be checked
with our staff
Compressor does
not start
The compressor protection (KLIXON,
where installed) has switched off:
• overheating due to an inadequate
cooling of the compressor motor.
• Blocked compressor due to high
temperature of the motor or high
current
• Loose connections which may
cause high currents
Important: After the shut-down of the
compressor, the resetting time will very
much depend on the environment of the
compressor. In a hot closed environment, it
will be 2 hours, in ventilated 1 hour
Note: The compressors are protected against
high temperatures and currents with an internal
or external device (Klixon).
Unit works for short
period then stops
and starts again after
a while
Switching of low pressure switch:
• Low gas level in the equipment
• •Outlet line of the compressor is
blocked due to saturated filter or
blocked thermostatic valve
Service by a refrigeration engineer
