- SYSTEM NOT EFFICIENT

- DOOR SEAL LEAKS

- ICING UP CONDENSER

- DIGITAL THERMOSTAT CONTROL

- BURNOUT COMPRESSOR: Before any compressor fails solid you may notice that the unit is hard-starting, particularly when starting against a head pressure (someone switched the system off while the compressor was running, then tried turning it right back on).

Another sign of a failing compressor is noisy motor operation, such as buzzing or clanking sounds coming from the outside unit housing the compressor motor.

Another sign that might indicate a failing compressor motor is an increase in the building's electrical bills even though the air conditioning system "on" time has not changed.

When a sealed compressor motor has "burned out" this means that the internal wiring of the motor has become irreparably damaged: the compressor motor windings may be burned and shorted together or shorted to the steel shell of the motor, or the windings may have burned and simply become "open" or disconnected. If the motor has burned out in either of these ways it needs to be replaced.

LEAKING GAS:

 Recommendations for gas measurement instruments, gas detection methods

 Using the  Gas leak Detector for air conditioning and refrigerant gas leaks

 Warnings about using instruments for detection of toxic gases

 How do we detect leaks in air conditioning or refrigeration equipment

 What are the common causes of refrigerant gas leaks in HVAC systems?

 Where to look first for leaks in air conditioning or heat pump refrigeration piping systems (also refrigerators & freezers)

 What are the effects of refrigerant leaks on operation of the equipment: moisture, dirt in the system, and what goes wrong

 What are the effects of air, moisture, or dirt contamination in the refrigeration system?

 Other refrigerant gas leak detection methods