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

Page: 93 / 138

360077-1/O 92
Horizon Series™ - Blood Bank Models
Problem Possible Cause Action
High Temperature
alarm activates when
the door is opened,
then clears shortly
after the door is
closed.
Chamber temperature
probe connection is
loose.
► Test the probe connections. Secure the
connections if necessary.
Chamber temperature
probe is faulty.
► Test the probe. Replace the probe if necessary.
Unit cooler fan
continues to run while
the door is open.
► Test the door switch and unit cooler fan
connections. Secure the connections if necessary.
Replace the door switch or fan motor if necessary.
Probe bottle is empty. ► Check level of product simulation solution in the
bottle. Refill bottles if needed.
High temperature
alarm setpoint is set
too low.
► Check the setpoint. Change the setpoint if
necessary.
A component is
faulty or internal
connections are loose.
► Contact Helmer Technical Service.
Refrigerator is
connected to power,
but the AC Power
Failure alarm is active.
Outlet connection is
faulty.
► Verify power at the outlet. Repair the original
outlet or connect to a different outlet if necessary.
Power cord is faulty. ► Confirm the power cord is connected securely.
Secure the power cord if necessary.
Power supply board is
faulty.
► Replace the power supply board.
Circuit breaker
was tripped (230 V
models).
►
Confirm the circuit breaker is seated. Push the
circuit breaker to reset it if necessary.
A component is
faulty or internal
connections are loose.
►
Contact Helmer Technical Service.
Door Open alarm is
activating sporadically.
Door(s) not closing
completely.
► Confirm the hinge cams are not damaged.
Replace the hinge cams if necessary.
Door(s) closing
but not sealing
completely.
► Confirm the door gasket seals completely.
Replace the door gasket if necessary.
Door switch
connection(s) is faulty.
► Test the switch connections. Secure the
connections if necessary.
One or both door
switches are faulty.
► Replace the door switch(s).
Control board is faulty. ► Replace control parts with those that are included
in the control and display board kit.
Door Ajar Timeout is
set to zero, causing
the alarm to activate
immediately when the
door is opened.
► Check the current setpoint for the Door Ajar alarm.
Change the setpoint if necessary.