Rev.01 03-27-17
Page 65 of 67
Compu-Aire
Wrong Temperature
or Humidity reading
or sensor fail
Wrong jumper setting
Pop open the sensor module and verify that
the setting on the temp/hum sensor board is
set to 0-1V
Power supply
Check for proper 24VDC coming on +G and
GND at the sensor board
Water damage
Check for water condensation on the probe.
Dry it out for any moisture. Relocate the
sensors if necessary.
Wrong offset /
Calibration
Check for sensor offset and recalibrate against
a reference point if necessary.
Alarm not reset
Alarm source not
rectified
Check for the cause of the alarm. The alarm
cannot be cleared if the cause of the alarm still
persists.
Stuck in Manual
Mode
Force components ON
Set all components under “Manual Ctrl”
screen to Auto mode
Compressor not ON
Incorrect setpoint
Check system setpoint for cooling
temperature. Compressor only runs when
temperature drops below room setpoint.
Reheat Lockout
Over amp protection
System incorporate a reheat lockout if cooling
and humidifier are ON
High Temperature
Temperature rises
above max setpoint
Room is too hot. Check sensor and reset
alarm after fixing the problem.
Low Temperature
Temperature drops
below min setpoint
Room is too cold. Check sensor and reset
alarm after fixing the problem.
High Humidity
Humidity rises above
max setpoint
Too much moisture in the air. Check and reset
the alarm after fixing the problem.
Low Humidity
Humidity drops below
min setpoint
Room is too dry. Check and reset the alarm
after rectify the problem.
No Air Flow
Static pressure drop
Check motor, duct work, and filter. Reset the
alarm after rectifying the problem.
Sensitive switch
Check and recalibrate the switch if necessary.
Consult the electrical wiring for more detail.
Dirty Filter
Clogged filter
Check and replace filter if necessary
Sensitive switch
Check the dirty air filter switch and recalibrate
the sensitivity level if necessary. Consult the
electrical wiring for more detail.
High Pressure
Refrigerant pressure
rises above limit
Check the high head pressure and reset the
alarm after a manual reset on the pressure
switch.
Low Pressure
Refrigerant pressure
drops below limit
Check for low pressure switch. Change low
pressure bypass time out and reset the alarm
after rectifying the problem.
Compressors short
cycling
Compress ON/OFF too
frequent
Check discharge and return air temperature.
Adjust compressor Max ON if needed.
Heater Overheat
Heater overload
Check if heater is overloading. Check and
reset alarm after rectifying the problem
