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| System Maintenance |
| Table 9 | Troubleshooting |
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| Symptom |
| Possible Cause | Check or Remedy |
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| No power to condenser | Check voltage at input terminal block |
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| Condenser will not start | Circuit breaker for low voltage | Locate problem in condenser electrical | |
| transformer in condenser is tripped | panel and repair | ||
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| No low voltage signal to/from indoor unit | Locate open circuit and repair |
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| Low indoor unit | Insufficient refrigerant in system | Check for leaks, repair, and add refrigerant | |
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| Check schematic for recommended | |||
| suction pressure | |||
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| setpoints too low | setpoints and adjust. |
| Low discharge pressure | Faulty head pressure control valve | Replace if defective | |
| or condenser FSC/VFD control | |||
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| Dirty condenser fins | Clean coil |
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| Check for low voltage signal from indoor unit |
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| High discharge pressure | Condenser fans not operating | Check fan motors and fuses | |
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| Check for correct ambient thermostat |
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| setpoints, as applicable. |
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| High refrigerant charge | Check refrigerant charge |
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| VFD Condenser trips out |
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| on overvoltage | Supply voltage is Delta configuration | Shut off AC voltage, locate the VFD, pull out | |
| (OU displayed on VFD | or is ungrounded/high impedance | the EMC tab and reconnect power | |
| controller) |
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| No voltage or improper phasing exists | Check voltage at input terminal block |
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| at condenser | |
| TVSS indicator lights are |
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| Electrical connections to TVSS are |
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| extinguished or red LED is | Locate connection problem and repair | ||
| faulty | |||
| illuminated and monitoring |
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| terminals 11/12 are closed | A surge exceeding the rating | Replace TVSS and inspect other | |
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| components for damage and replace them if | |
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| of the TVSS has occurred | |
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| necessary | |
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36
