Failure Diagnosis Andsolution - Carrier 39CQ Series Installation, Operation And Maintenance Instructions

Failure diagnosis and solution
No. Fault indicated on HMI
1 supply fan can't start
2 supply fan failure
3 fire alarm
4 filter blocking
5 frost-protection
6 humidifier failure
7 return air temperature sensor failure
8 outlet air temperature sensor failure
9 supply air humidity sensor failure
10 indoor temperature sensor failure
11 indoor humidity sensor failure
12 supply air humidity sensor failure
13 CO2 sensor failure
14 static pressure transducer failure
15 damper temperature sensor failure
16 Maintenance alarm
Solution
check wiring and contacts
check converter of supply fan
checking fire alarm sensor movement if the fire alarm signal
appears
remove and clean filter
check if the temperature of cold water is too low
check if any humidifier fault with reference to its manual
replacing the sensor with reference to the manual
replacing the sensor in accordance with the manual
replacing the sensor in accordance with the manual
replacing the sensor in accordance with the manual
replacing the sensor in accordance with the manual
replacing the sensor in accordance with the manual
replacing the sensor in accordance with the manual
replacing the sensor in accordance with the manual
replacing the sensor in accordance with the manual
check the fans
16