CME1356R and CME1656R
Service Diagnosis
Problem or Symptom | Possible Cause | Probable Correction |
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| Scale in water system. | Clean water system. |
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| Water or Air Temperatures too | Check temps. Unit cannot |
| operate with water and air | |
| cold | |
| temps below stated limits. | |
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| Low system charge | Recover and weigh charge. |
| Bypass solenoid does not open | Check solenoid operation |
Poor Harvest | Check valve leaks back | Replace check valve |
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| Check for power to the coil, if |
| Hot gas valve does not open | there is power, replace the hot |
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| gas valve |
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| Head pressure control valve | Replace the head pressure |
| does not maintain enough | |
| control valve | |
| pressure (in freeze) | |
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| High discharge pressure, from a | Clean the condenser, repair the |
| dirty condenser or faulty fan | |
| fan motor | |
| motor | |
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| Extreme hot location | Relocate the cabinet |
| Extremely hot condenser | Move condenser or provide |
| location | shade |
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| Overcharge of refrigerant | Recover, evacuate and weigh in |
| the nameplate charge | |
Low capacity |
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| At the end of the freeze cycle, | |
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| there should be a definite |
| Hot gas valve leaks thru, unit off | difference in temperature |
| on refrigeration error | between the inlet and outlet of |
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| the Hot Gas Valve. If not, |
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| replace the hot gas valve |
| Liquid and discharge lines are | Separate and insulate them |
| in contact with each other | |
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| Low on refrigerant, locate leak, |
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| recover refrigerant, repair leak, |
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| replace drier, evacuate and |
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| weigh in the nameplate charge. |
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| TXV superheat too high, check |
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| charge, if charge is OK, replace |
Compressor cycles on and off | Compressor overheats | TXV |
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| Mechanical fault with |
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| compressor, replace |
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| compressor |
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| Internal relief valve opened, |
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| check for cause of high |
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| discharge pressure |
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May 2001
Page 34
