TROUBLESHOOTING CHART
COOLING/HP ANALYSIS CHART
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| Unsatisfactory Cooling/Heating |
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Complaint |
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POSSIBLE CAUSE | SYMPTOM | startnotwillSystem | startnotwillFanCond.andComp. | startnotwillfanEvaporator | startnotwillfanCondenser | overloadoncyclesCompressor | warmtoothenandcoolToo dayswarmonenoughcoolNot | toootherscool,tooareasCertainwarm | noisyisCompressor | defrostterminatenotwillUnit | defrostnotwillUnit | pressuresuctionLow | pressureheadLow | pressuresuctionHigh | pressureheadHigh | |||||
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DOTS IN ANALYSIS |
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| Test Method |
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| Remedy | |
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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| Inspect Fuse Size & Type |
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Unbalanced Power, 3PH |
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| Test Voltage | |||
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Loose Connection |
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| Inspect Connection - Tighten | |||
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Shorted or Broken Wires |
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| Test Circuits With Ohmmeter | ||||||
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Open Fan Overload |
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| Test Continuity of Overload | ||
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Faulty Thermostat |
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| Test Continuity of Thermostat & Wiring | ||||
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Faulty Transformer |
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| Check Control Circuit with Voltmeter | ||
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Shorted or Open Capacitor |
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| Test Capacitor | |||||
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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 & Contacts | ||
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Faulty Fan Relay |
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| Test Continuity of Coil And Contacts | |
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Open Control Circuit |
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| Test Control Circuit with Voltmeter | |
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Low Voltage |
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| Test Voltage | |||
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Faulty Evap. 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 | ||
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Shortage of Refrigerant |
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| • | Test For Leaks, Add Refrigerant | |||||
Restricted Liquid Line |
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| Remove Restriction, Replace Restricted Part | |
Open Element or Limit on Elec. Heater |
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| Test Heater Element and Controls |
Dirty Air Filter |
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| ♦ Inspect | ||||
Dirty Indoor Coil |
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| ♦ Inspect Coil - Clean | |
Not enough air across Indoor Coil |
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| • | ♦ | • | ♦ Check Blower Speed, Duct Static Press, Filter | |
Too much air across Indoor Coil |
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| • | Reduce Blower Speed | ||||||
Overcharge of Refrigerant |
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| • | Recover Part of Charge | ||||
Dirty Outdoor Coil |
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| • | Inspect Coil - Clean | |
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. | ||
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Improperly Located Thermostat |
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| Relocate Thermostat | ||
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Air Flow Unbalanced |
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| Readjust Air Volume Dampers | ||
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System Undersized |
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| Refigure Cooling Load | ||
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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 |
Wrong Type Expansion Valve |
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| ♦ Replace Valve | |||||
Expansion Device Restricted |
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| • | Remove Restriction or Replace Expansion Device |
Oversized Expansion Valve |
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| • | Replace Valve |
Undersized Expansion Valve |
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| Replace Valve | ||||
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Expansion Valve Bulb Loose |
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| Tighten Bulb Bracket | ||
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Inoperative Expansion Valve |
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| Check Valve Operation | |||
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Loose |
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| Tighten Bolts | |
Faulty Reversing Valve |
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Faulty Defrost Control |
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| ♦ Test Control | |||
Faulty Defrost Thermostat |
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| ♦ | ♦ | ♦ | ♦ | ♦ | ♦ | ♦ | Test Defrost Thermostat |
Flowrator Not Seating Properly | • |
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| Check Flowrator & Seat or Replace Flowrator |
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| Cooling or Heating Cycle (Heat Pump) |
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| ♦ Heating Cycle Only (Heat Pump) | |||||||||||||||
See Service Procedure Ref.
28
