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Heating
Cooling
Air Duct Cleaning
Troubleshooting
DISCHARGE PRESSURE
Fluctuating Discharge Pressure
High Discharge Pressure
Low Discharge Pressure
HIGH SUPERHEAT (evaporator outlet)
Measuring and Adjusting Operating Superheat
Cap Tube or TEV Distributor Restricted
Excessive Load on Evaporator Above Design Conditions
Flash Gas in the Liquid Line
Gas-Charged TEV (MOP)
Improper Piping Design
Inadequate Subcooling
Internally Equalized TEV
Liquid Line Restriction
Low Head Pressure
Power Element Failure or Loss of Charge
Superheat Adjustment Too High
System Contamination
Undersized TEV
LOW SUPERHEAT (evaporator outlet)
Cold Suction Line/Compressor Location – Liquid Migration to Low Side During Off Cycle
Compressor Oversized
Cracked Diaphragm or Bellows- Automatic Expansion Valve
Evaporator Fan Blades On or Running Backwards
Excessive Accumulation of Oil in Evaporator
Excessive Coil Frosting
Excessive Subcooling
External Equalizer Line Plugged or Capped
Faulty TEV or Wrong Charge in Sensing Bulb
Interrupted Pumpdown
Long, Free Draining Suction Line to Compressor
Overcharge of Refrigerant and/or Oil
Oversized Condenser
Oversized TEV
Poor Bulb and Equalizer Location
Poor Distribution Through Evaporator Circuits
System Contamination
TEV Seat/Liquid Line Solenoid Seat/Compressor Discharge Valve Leaks During Off Cycle
TEV Superheat Setting Too low
SUCTION PRESSURE
Fluctuating Suction Pressure
High Suction Pressure- High Superheat (evaporator outlet)
High Suction Pressure- Low Superheat (evaporator outlet)
Low Suction Pressure- High Superheat (evaporator outlet)
MISCELLANEOUS
Compressor Starts, but Motor Cycles Off on Overload Protector
Faulty Controls
High Amperage Draw
Loss of Oil, Oil Pressure, or Oil Pressure Control Trip Out
Unit Runs Continuously- Adequately Sized, Inadequate Cooling
Unit Starts, but Short-cycle
Unit Will Not Start
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