360077-1/O
122
Horizon Series™ - Laboratory, Pharmacy, and International 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.
Monitor/control board
is faulty.
►
Confirm the monitor/control board is operating
correctly. Replace the board if necessary.
Compressor starting
relay is faulty.
►
Confirm the relay is operating correctly. Replace it
if necessary.
Defrost timer is
faulty (HLR and HPR
models).
►
Replace the defrost timer.
26.3
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.
Monitor/control board
is faulty.
►
Replace the monitor/control board.
Alarm buzzer is faulty.
►
Replace the alarm buzzer.
Audible alarms have
been muted.
►
Verify audible alarms are not muted.
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.
Monitor/control board
is faulty.
►
Replace the monitor/control board.
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.