Helmer (Version A) HB120(Versions A and B), Service Manual

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360077-1/O 90
Horizon Series™ - Blood Bank Models
19.2 Chamber Temperature Problems
Problem Possible Cause Action
Chamber temperature
displayed is higher or
lower than the actual
temperature.
Chamber temperature
probe connection is
loose.
► Test the probe connection. Secure the connection
if necessary.
Temperature probe
wiring is an open
circuit.
► Check the continuity of the probe wiring. Replace
the probe if necessary.
Probe bottle is empty,
or solution is too low.
► Check the level of product simulation solution in
the bottle. Refill the bottles if necessary.
Monitor is not
calibrated.
► Confirm the temperature probe is reading correctly.
Calibrate the probe if necessary.
Digital electronics are
locked because of an
interruption in power.
► Reset the monitoring system.
A component is
faulty or internal
connections are loose.
► Contact Helmer Technical Service.
Chamber temperature
does not stabilize
at the refrigerator
setpoint.
Compressor starting
relay is faulty.
► Confirm the relay is operating correctly. Replace
the relay if necessary.
Temperature controller
is faulty.
► Confirm the temperature controller is operating
correctly. Replace it if necessary.
Condensing unit fan is
not running.
►
Check the condensing unit fan connections.
Replace the fan motor if necessary.
Unit cooler fan is not
running.
►
Check the voltage to the fan when door switch is
activated. Replace the fan motor or door switch if
necessary.
Compressor motor
has seized.
► Replace the compressor.
Temperature control
probe is faulty.
► Confirm the probe is providing resistance in the
range of 98 Ω to 110 Ω. Replace the probe if
necessary.
Refrigerant level is too
low.
► Check the refrigeration lines for leaks and repair
them if necessary.
► Check the refrigerant level. Recharge the
refrigerant if necessary.
Condenser grill is
dirty.
► Check the condenser grill. Clean it if necessary.
Circulation at the top
of the chamber is not
adequate.
► Check if there are any items that may obstruct air
flow and remove them if necessary.
Ambient air
temperature is too
high.
► Confirm the refrigerator is placed appropriately.
Refer to the operation manual.
A component is
faulty or internal
connections are loose.
► Contact Helmer Technical Service.
Probe bottle is empty,
or solution is too low.
► Check the level of product simulation solution in
the bottle. Refill the bottles if necessary.