Carrier CCU - Table of Alarms and Troubleshooting

11.3 - Table of alarms
Faults Sources Causes Solutions
Filtration fouled
Pressure sensor
Filter fouled • Clean or replace the lter
Filtration blocked
Filter too dirty (ventilation
stopped)
• Replace the lter
No air ow
Belts
• Check the tension
• Replace the belts
Filters • Clean or replace
Fan • See fan fault
Damper
• Check the opening
• Check the servomotor
Motor • Check the direction of rotation
Network • Check the network pressure drop
Fan/motor
Belts
Switch
Circuit breaker
Embedded
thermistor
Fan stopped • Check the belts
Motor
• Check the motor's power supply
• Check the switch, the circuit breaker setting, the motor's
embedded thermistor
• Check the motor cooling
• Measure the input current
Electric heater Electric heater
Overheating
• Check the air ow rate
• Measure the input current
• Measure the supply voltage
• Check the fan delay duration
No heating
• Check the supply voltage
• Check the switches, the circuit breakers, the triac (option), the
control component
• Reset the thermostat (clear the fault before resetting)
Humidier
Humidier The humidier does not work
• Check the supply voltage
• Check the switch, the circuit breaker, the control component and
the humidier control panel
Cylinder Cylinder dirty Change the cylinder
No production of
steam
No water in the cylinder
• Check the water supply
• Check that the valve is operating correctly
• Check the power supply to the electrodes
• Add a handful of salt to the cylinder
• Refer to the indications on the humidier control panel
Drain Pan overowing
• Check that the drain valve is operating correctly
• Check that the drain circuit is not blocked
Condensation unit Refrigeration stopped
• Refer to the manual or to the unit's controller to troubleshoot the
fault
Water leak Water leak sensor
Pan overowing
• Check that the siphon is of the correct design
• Check the priming of the siphon
• Check that the condensate is draining correctly
• Check that the air ow is not too high
Coil or humidier leak • Find the leak and stop it
Sensor
Temperature
sensor
• Check the sensor
• Check the connection and continuity of the cable
No more operation or
display
Eprom memory • Contact CARRIER After-Sales
The time is wrong
Fault with the CPU board
battery - the timer has
stopped working
• Change the battery
11 - COMMISSIONING
29