Manual 2100-665A
Page
41 of 51
Signal
Description
Possible Cause
Component to Check
Recommended Action
Device
Actions
Low Pressure
Alarm
Alarm is activated
when a low pressure
event is present in the
refrigeration system
and the compressor is
running.
Lack of refrigerant
Run the unit and
check if the low
pressure value is in
the normal range.
Charge appropriate
amount of
refrigeration.
Compressor/
Condensor Fan:
Off
The switch is defective.
Check if the pressure
switch is OK.
If defective, replace.
Connection to the
corresponding
input terminal is
disconnected or the
controller board is
defective.
Check if the
connection is OK.
Check if the controller
board is OK.
Repair connection. If
the controller board is
defective, replace.
High Pressure
Alarm
Alarm is activated
when a high pressure
event is present in the
refrigeration system.
Abnormal site
condition
Check open door or
for abnormal site
condition. Check if
the high pressure
value is in the normal
range.
Clean the condenser.
Compressor/
Condensor Fan:
Off
Condenser fan has
failed. The condenser
fan speed controller
has failed.
Check the condenser
fan status while the
high pressure is
outside the normal
setting.
Replace the
condenser fan.
Replace the
condenser low
ambient (fan speed)
controller.
The switch is defective.
Check if the high
pressure switch is
OK.
If defective, replace.
Connection to the
corresponding
input terminal is
disconnected or the
controller board is
defective.
Check if the
connection is OK.
Check if the controller
board is OK.
Repair connection. If
the controller board is
defective, replace.
Dirty Air Filter
Alarm
The alarm is a warning
to check the filter.
Alarm can only be
reset manually.
Filter is clogged.
Check if the filter is
dirty.
Clean or replace the
filter.
Connection to the
corresponding
input terminal is
disconnected or the
controller board is
defective.
Check if the
connection is OK.
Check if the controller
board is OK.
Repair connection. If
the controller board is
defective, replace.
The value set for the
differential air pressure
switch is too low.
Check the differential
air pressure switch
value.
Correct the value of
the switch to standard
value.
Freeze Alarm
Low temperature
detected at evaporator
coil.
Low airflow
Blower
Ensure blower is
operating correctly.
Compressor: Off
Blower: On
Low load
Space temperature
input
Ensure sensor is
operating correctly.
TROUBLESHOOTING MULTI-TEC WALL-MOUNT UNIT ALARMS
In the event that a problem is encountered with a wall-mount unit, the TEC-EYE
TM
hand-held tool may be used to
diagnose the cause. If the problem can’t be resolved using these guidelines, contact the BARD Technical Service
Department at 419.636.0439 for assistance.
