The compressor runs continuously or for abnormally long periods without cycling off. This can indicate condenser airflow problems, a sealed system leak, restriction, or an inefficient compressor.
| Possible Cause | How to Fix |
|---|---|
| High ambient temperature | Allow unit to adjust; check ventilation around unit |
| Excessive door openings | Allow unit to pull down with door closed |
| Clogged condenser | Clean condenser; instruct customer |
| Condenser fan obstructed or defective | Clear obstruction or replace fan |
| Kickplate/grille restricted | Remove restriction |
| Sealed system leak (both pressures low) | Locate leak, flush system, repair. If low-side leak, also replace compressor and drier. |
| High-side restriction (low side low, high side high) | Locate restriction (crimped tubing), repair. Replace compressor + drier if caused by moisture from leak. |
| Inefficient compressor (low side high, high side low) | Replace compressor |
Low: 8-18 PSIG, High: 85-95 PSIGLow: -2 to 2 PSIG, High: 75-85 PSIGLow: -2 to 2 PSIG, High: 80-90 PSIGLow: 10-20 PSIG, High: 70-80 PSIGLow: -3 to 2 PSIG, High: 80-90 PSIGAt 90°F ambient, high-side pressures increase significantly. 700TR: 105-115, 700TC/I: 115-120, 700TF/I: 115-120, 700BR: 110-120, 700BF/I: 110-120 PSIG.
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Start by cleaning the condenser and checking the condenser fan. If the compressor still won't cycle, sealed system pressures need to be checked by a technician.