UNIMAGNA TROUBLESHOOT
| Problem | Problem Cause | Remedies |
|---|---|---|
| Unit will not run | Blown fuse | Replace fuse |
| Low voltage |
– Check outlet with volt meter, should read 198-242 volts. – If circuit is overloaded, either reduce load or have electrician install separate circuit. – If unable to remedy by any other way, install AVR |
|
| Defective service cord | Check continuity; repair or replace if necessary | |
| Unit electrically grounded | Check continuity; repair or replace if necessary | |
| Broken lead to compressor, timer or T-control | Repair or replace broken leads | |
| Defective AVR / motor protector | Check AVR /motor protector, replace if necessary | |
| Defective motor or T-control | Jumper across terminals of control. If units runs and connection are all right, replace T-control | |
| Defective Relay | Check relay, replace if necessary | |
| Defective Overload | Check overload, replace if necessary | |
| Defective Compressor | Check compressor, replace if necessary | |
| Chiller too warm | Repeated door openings | Instruct user |
| Overloading of shelves, blocking normal air circulation in cabinet. | Instruct user | |
| T-control knob set at low position, not allowing unit to operate often enough | Turn knob to colder position. | |
| Poor door seal | Level cabinet, adjust door gasket. Replace gasket if necessary. | |
| Not enough air circulation around cabinet. | Relocate cabinet or provide clearances to allow sufficient circulation. | |
| Dirty condenser / obstructed airflow | Clean condenser and clear air passage | |
| Shortage of refrigerant | Check for leak; for system repro | |
| Defective intake value | Replace motor compressor | |
| Chiller too cold | T-control knob turned to coldest position | Turn control knob to warmer position. |
| Defective T-control | Replace temperature control | |
| T-control sensor not properly positioned. | Reposition t-control sensor properly and tighten clamp | |
| Unit runs all the time won’t cut off | Not enough air circulation around cabinet or air circulation is restricted |
– Relocate cabinet or provide clearances around cabinet. – Remove restriction |
| Poor door seal |
– Check and make necessary adjustments – Replace gasket if necessary |
|
| Refrigerant charge | Undercharge / overcharge – check, system reprocessing | |
| Room temp too warm | Ventilate room as much as possible | |
| Defective T-control | Check t-control; replace if necessary | |
| Excessive door openings | Instruct customer | |
| Noisy operation | Tube vibration | Move tube |
| Cabinet not level | Level cabinet | |
| Drain pan vibration | Move pan; place stiffener if necessary | |
| Fan blade hitting guard or housing | Move fan blade; reposition | |
| Compressor external noise | Replace compressor rubber mounting | |
| Compressor internal noise | Replace compressor | |
| Abnormal cut-in/cut-off | Low voltage |
– Check outlet. Voltage should be 220V +/- 10%. Check for several appliances connected on the same circuit or extremely long or undersize extension cord used. – Provide AVR if necessary |
| Defective AVR | Replace AVR | |
| Defective relay | Replace Relay | |
| Defective overload | Replace overload protector | |
| Frost or ice formation on evaporator fins | Defective defrost heater | Replace heater |
| Defective T-control | Replace T-control | |
| Dirty evaporator fins | Clean evaporator fins | |
| Leaky door gasket: deform / worn out |
– Knead gasket – Replace gasket if necessary |
|
| Mis-align door | Adjust door hinges; align door | |
| Excessive door openings | Instruct customer | |
| Intermittent icing of evaporator plate | Moisturized refgn system | Reprocess system |