Fri-Jado MCC 120, Service Manual

Page: 68 / 105

Page 68 Service Manual MCC Cold US 20220700
9.2 Trouble Shooting Symptoms and causes
Symptom Possible causes
No power 1. Main circuit breaker open
2. Fuse Blown
3. Loose wire connection
Main fuse or breaker blown 1. Wiring incorrectly
2. Short circuit heating element
3. Short circuit fan element
4. Short circuit wiring
Illumination does not work 1. Led malfunction
2. Tumble switch malfunction
3. Led driver malfunction
4. Loose / short circuit wiring connection
No cooling 1.Compressor malfunction
2 Loose wiring connection
3. Thermostat malfunction
4. Loose wiring connection
5. Air flow not functioning
Unit does not reach desired temperature 1. Cooling unit malfunction (COLD unit only)
2. Strong air current along unit / Draft
3. Burned contact on contactor
4. Sensor malfunction
5. Sliding doors not closed
No indication on controller 1. Electronic controller malfunction
2. Blown fuse
3. Loose wiring connection
No air flow inside unit 1. Fans do not work
2. Blown fuse
3. Loose wiring connection
4. 24Vdc power supply malfunction
Evaporator full of ice 1. Set point too low
2. Humidity too high
3. Defrost sensor not in right position
4. Defrost sensor malfunction
5. Parameters not according the specified values
6. Electronic thermostat malfunction