Cause
- Discharge pressure is over the maximum for 10 minutes within the last hour.
| Components | Troubleshooting | Corrective actions |
|---|---|---|
| Restrictions in the refrigeration system. | Restrictions in the refrigeration system. | Open Liquid Line Service Valve as needed. |
| Filter Drier | Check the filter drier, if it is iced up or very cold it indicates that the filter drier needs replacement. | Replace the filter drier if needed, refer to FILTER DRIER Service Section 6.13. |
| Condenser Fan | Check Condenser Fan for proper operation. | Correct as required. |
| Discharge Pressure Transducer (DPT) | Confirm accurate DPT pressure readings, refer to MANIFOLD GAUGE SET Section 6.2. | Replace DPT if defective. |
| Non-condensables in the refrigeration system. | With the unit off allow system to stabilize to ambient temperature. Check system pressure against PT Chart for 134a, refer to Table 6−4. | Correct as required, refer to Refrigerant Charge Section 6.7.1. |
| Refrigerant | Check refrigerant level. | Correct as required, refer to Refrigerant Charge Section 6.7.1. |
