Heating, Ventilation, and Air Conditioning (HVAC ) Electrical Practice Test

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What condition could cause the compressor and condenser fan to not run while the blower motor is operating?

A faulty fan switch
The HP, LP, overloads, or oil pressure switch are open
A dirty air filter
A malfunctioning thermostat

The correct answer is: The HP, LP, overloads, or oil pressure switch are open

The scenario described involves the compressor and condenser fan not operating while the blower motor is functioning. This situation is often linked to protective devices or safety switches within the HVAC system. If any of the high-pressure (HP), low-pressure (LP), overload, or oil pressure switches are open, they can prevent the operation of the compressor and condenser fan. These switches are crucial for system protection, ensuring that the compressor does not run under unsafe conditions such as excessively high or low refrigerant pressures, motor overload, or insufficient oil pressure. When they are triggered and remain open, the control circuit for the compressor and condenser fan is interrupted, preventing them from starting while allowing the blower motor to operate. This is a common protection mechanism to prevent further damage to the compressor or other components in the system, highlighting the importance of these safety features.