Maintenance troubleshooting
WARNING
Hazardous voltage!
Disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/tagout procedures to ensure the power can not be inadvertently energized. Failure to disconnect power before servicing could result in death or serious injury.
Troubleshooting
Use the following steps and procedures to help correct these common problems.
Problem | Remedy |
The entire unit does not operate. | 1. Check for blown fuses or tripped circuit breakers. Replace or reset if necessary. |
Possible cause | 2. Setting may be too high; check unit and reset. Thermostat may be out of calibration |
1. Power interruption | or otherwise defective; replace. |
2. Thermostat not operating | 3. Correct as required. |
3.Electrical panel: a)
Problem | Remedy |
Fan runs but compressor does not start. | 1. Check power supply for voltage outside the acceptable voltage range. |
Possible cause | 2. Check the control unit for loose wires. Firm any loose connections. |
1. Low voltage | 3. Replace. |
2. Remote thermostat | 4. Check for loose wire connection, broken or burned contacts. If defective, replace. |
3. Compressor contactor open or burned | 5. Locate leak and repair. Recharge unit. |
4 .High pressure control cutting out unit | 6. Tug on wires to see if they will separate from connections. Replace terminals if |
5. Refrigerant leak - no gas | necessary. |
6. Loose or defective wires. | 7. Check for shorts, opens, and grounded. Remove and replace compressor. |
7. Compressor shorted, open or burned | 8. Remove and replace. |
8. Defective compressor |
|
Problem | Remedy |
Unit held off by safety. | 1. Adjust tubes by bending slightly to firm position without touching other unit parts. |
Possible cause | 2. Level unit base. Fully support base. |
1. Unit cutout on high pressure control, set at 3. Check and tighten loose screws. | |
385 psig | 4. Tighten screws on fan wheel shaft. |
2. Refrigerant leak | 5. Adjust wheel position on motor shaft |
3. Air restriction, dirty coils | 6. Replace fan motor. |
4. Partial restriction in refrigerant system | 7. Replace fan bearing. |
5. High pressure control |
|
6. TXV power element charge loss |
|
7. Loose connection in electrical unit |
|
Problem | Remedy |
Noisy operation. | 2. See if unit is low on refrigerant charge. Repair leak and recharge unit. |
Possible cause | 3. Verify if the air filter is dirty or has an airflow restriction, and correct problem. |
1. Copper tubing vibrating | 4. Locate restriction by inspecting refrigerant lines for temperature changes. Remove |
2. Machine vibrating out of level | restriction, evacuate, and recharge. |
| 5. Replace, if defective. |
| 6. Evacuate, replace element, recharge. |
| 7. Trace and firm up connection. |
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