Carrier 39CQ Series - Failure Diagnosis and Solution

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