Troubleshooting Information
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| Unsatisfactory |
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Complaint |
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| No Cooling |
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| Operating |
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| Cooling |
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| Pressures |
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| startnotwillSystem | start | startnotwillfanEvaporator | startnotwillfanCondenser | overloadoncyclesCompressor |
| warmtoothenandcoolToo | dayswarmonenoughcoolNot | otherscooltoareasCertainto warm |
| noisyisCompressor | pressuresuctionLow |
| pressureheadLow | pressuresuctionHigh |
| pressureheadHigh |
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POSSIBLE CAUSE | SYMPTOM | CondenserandCompressorFan will not |
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DOTS IN ANALYSIS |
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| Test Method |
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GUIDE INDICATE |
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"POSSIBLE CAUSE" |
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Power Failure |
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| Test Voltage |
Blown Fuse |
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| Impact Fuse Size & Type |
Loose Connection |
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| Inspect Connection - Tighten |
Shorted or Broken Wires |
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| Test Circuits with Ohmmeter |
Open Overload |
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| Test Continuity of Overloads |
Faulty Thermostat |
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| Test Continuity of Thermostat and Wiring |
Faulty Transformer |
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| Check Control Circuit with Voltmeter |
Shorted or Open Capacitor |
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| Test Capacitor |
Internal Compressor Overload Open |
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| Test Continuity of Overload |
Shorted or Grounded Compressor |
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| Test Motor Windings |
Compressor Stuck |
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| Use Test Cord |
Faulty Compressor Contactor |
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| Test Continuity of Coil and Contacts |
Faulty Fan Relay |
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| Test Continuity of Coil and Contacts |
Open Control Circuit |
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| Test Control Circuit with Voltmeter |
Low Voltage |
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| Test Voltage |
Faulty Evaporator Fan Motor |
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| Repair or Replace |
Shorted or Grounded Fan Motor |
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| • | Test Motor Windings |
Improper Cooling Anticipator |
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| Check Resistance of Anticipator |
Shortage or Refrigerant |
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| Test For Leaks, Add Refrigerant |
Restricted Liquid Line |
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| Replace Restricted Part |
Undersized Liquid Line |
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| Replace Line |
Undersized Suction Line |
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| Replace Line |
Not Enough Air across Indoor Coil |
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| Speed Blower, Check Duct Static Pressure |
Too Much Air across Indoor Coil |
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| Reduce Blower Speed |
Overcharge of Refrigerant |
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| • | Recover Part of Charge |
Noncondensibles |
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| • | Recover Charge, Evacuate, Recharge |
Recirculation of Condensing Air |
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| • | Remove Obstruction to Air Flow |
Infiltration of Outdoor Air |
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| Check Windows, Doors, Vent Fans, Etc. |
Improperly Located Thermostat |
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| Relocate Thermostat |
Air Flow Unbalanced |
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| Readjust Air Volume Dampers |
System Undersized |
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| Refigure Cooling Load |
Broken Internal Parts |
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| Replace Compressor |
Broken Valves |
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| Test Compressor Efficiency |
Inefficient Compressor |
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| Test Compressor Efficiency |
High Pressure Control Open |
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| Reset and Test Control |
Unbalanced Power, 3PH |
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| Test Voltage |
Wrong Type Expansion Valve |
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| Replace Valve |
Expansion Valve Restricted |
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| Replace Valve |
Oversized Expansion Valve |
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| Replace Valve |
Undersized Expansion Valve |
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| Replace Valve |
Expansion Valve Bulb Loose |
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| Tighten Bulb Bracket |
Inoperative Expansion Valve |
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| Check Valve Operation |
Loose |
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| Tighten Bolts |
For detailed service information refer to the Remote Condensing Unit Service manual.
NOTICE
UNITS WITH ROTARY OR RECIPROCATING COMPRESSORS AND
TXV’S REQUIRE A HARD START KIT.
10
