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

Page: 94 / 138

360077-1/O 93
Horizon Series™ - Blood Bank Models
Problem Possible Cause Action
All alarms are
activating sporadically.
Alarm system is faulty. ► Confirm the circuit board and line connections are
functioning correctly.
A component is
faulty or internal
connections are loose.
► Contact Helmer Technical Service.
Control board is faulty. ► Replace control parts with those that are included
in the control and display board kit.
An alarm activated,
but the temperature
recorded at activation
does not match the
alarm setpoint.
Monitor is not
calibrated.
► Confirm the temperature probe is reading correctly.
Calibrate the probe if necessary.
Temperature changed
slightly around the
time of activation.
► No action needed.
19.4 Condensation Problems
Problem Possible Cause Action
Excessive water in
the water evaporation
tray.
Heater in the
evaporation tray is
faulty.
► Confirm the heater is hot and is drawing the
appropriate current.
► For 115 V refrigerators, the current should be
approximately 0.43 A to 0.55 A.
► For 230 V refrigerators, the current should be
approximately 0.21 A to 0.35 A.
Humid air is entering
the chamber.
► Confirm the refrigerator is level, and the doors are
aligned, closing tightly, and sealing correctly.
► Contact Helmer Technical Service to correct issues
as necessary.
Excessive water in the
chamber.
Humid air is entering
the chamber.
► Confirm the refrigerator is level, and the doors
are aligned, closing tightly, and sealing correctly.
Correct issues as necessary.
Connection between
the unit cooler and the
drain tube is loose.
► Confirm the connection is secure. Tighten the
connection if necessary.
Drain line is plugged. ► Confirm the drain tube is free of debris. Remove
debris if necessary.
Excessive humidity on
the doors.
Humid air is entering
the chamber.
► Confirm the refrigerator is level, and the doors
are aligned, closing tightly, and sealing correctly.
Correct issues as necessary.
Relative humidity
around the refrigerator
is too high.
► Confirm the refrigerator is placed properly. Refer
to the operation manual.