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

Page: 92 / 138

360077-1/O 91
Horizon Series™ - Blood Bank Models
Problem Possible Cause Action
Compressor runs
continuously.
Refrigerator setpoint
is set too low.
► Confirm the setpoint is set within the operating
range. Change the setpoint if necessary.
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.
Temperature controller
is faulty.
► Confirm the temperature controller is operating
correctly. Replace the board if necessary.
Compressor starting
relay is faulty.
► Confirm the relay is operating correctly. Replace it
if necessary.
19.3 Alarm Activation Problems
Problem Possible Cause Action
Refrigerator is in
an alarm condition,
but alarms are not
audible.
Alarm system is faulty. ► Confirm the circuit board and line connections are
functioning correctly.
Control board is faulty. ► Replace control parts with those that are included
in the control and display board kit.
Alarm buzzer is faulty. ► Replace the alarm buzzer.
Audible alarms have
been muted.
► Verify audible alarms are not muted. If the time
remaining on the MUTE timer is greater than
5 minutes, change the MUTE timer value to 5
minutes and wait until the timer resets.
A component is
faulty or internal
connections are loose.
►
Contact Helmer Technical Service.
Refrigerator meets an
alarm condition, but
the appropriate alarm
is not active.
Control board is faulty.
►
Replace control parts with those that are included
in the control and display board kit.
Alarm setpoint was
changed.
► Check the current setpoints for the alarms.
Change the setpoints if necessary.
A component is
faulty or internal
connections are loose.
► Contact Helmer Technical Service.