Helmer Scientific i.Series
®
and Horizon Series
™
Refrigerator - Pass-Thru
Service and Maintenance Manual
360429/A
57
13 Troubleshooting
NOTICE
Review all safety instructions prior to troubleshooting.
13.1 Access System Problems
Problem
Possible Cause
Action
Door does not lock
Lock mechanism is damaged.
Inspect lock/latch, Replace if necessary.
13.2 Chamber Temperature Problems
Problem
Possible Cause
Action
Display temperature does not
match actual chamber temperature
Display temperature needs
to be calibrated.
Follow temperature calibration procedure.
Probe bottle is empty, or
probe is out of bottle or
ballast.
Check the level of product simulation solution in the bottle. Verify probe is
fully inserted in bottle or ballast.
Displayed temperature is too warm
or too cold.
Probe bottle is empty, or
probe is out of bottle or
ballast.
Check the level of product simulation solution in the bottle. Verify probe is
fully inserted in bottle or ballast.
Primary Monitor probe
needs to be calibrated.
Calibrate Primary Monitor probe.
Door was recently opened
or opened for an extended
time.
Close door and allow temperature to stabilize.
Condenser coil is dirty
Clean the condenser coil.
Lack of air flow around unit/
high ambient condition.
Check for proper spacing around unit, any foreign objects blocking air flow,
and ambient temperature is within location specifications.
Lack of air flow inside of
chamber.
Check product placement and move products that block air flow around
evaporator fan.
Temperature setpoint was
adjusted.
Check temperature setpoint and temperature settings. Change to default settings
or desired setpoint if necessary.
Control probe is reading too
high/low.
Check control offset setting. Adjust if necessary.
Unit cooler fan motor (inside
chamber) is not running.
Check voltage to the fan motor using schematic. Replace fan motor if necessary.
Condenser fan motor
(exterior) is not running.
Check voltage to the fan motor using schematic. Replace fan motor if necessary.
Compressor is not running.
Check voltage to the compressor using schematic. Replace compressor start
components if necessary.
13.3 Alarm Activation Problems
Problem
Possible Cause
Action
Probe failure alarm is active
(ER01 monitor or ER02 control)
Faulty probe or wiring
connection.
Check corresponding probe connection.
Test resistance of probe (86Ω to 110Ω). Replace probe if necessary.
Power failure alarm is active.
(POFF)
Power was interrupted to
refrigerator.
Restore facility power.
Power switch is in the off “o”
position.
Turn power switch to the on “-” position.
Power cord is loose.
Check the power cord at the power receptacle on the wall and on the
refrigerator.
GFI/GFCI outlet has tripped.
Move to standard outlet. Helmer does not recommend operating this unit
on a GFI outlet.
The Door Open alarm is active.
Door is not closed completely.
Close door.
Door switch or wiring
connection is faulty.
Check wiring and continuity of switch contacts. Replace the door switch if
necessary.
Horizon Series
