Diagnosing a faulty evaporator fan in an air-conditioning unit with two compressors requires some troubleshooting steps. Here's a general guide to help you identify the issue:
Observe the Evaporator Fan: Turn on the air conditioning unit and check if the evaporator fan is spinning. If it's not running or is running slowly, it might be faulty.
Check for Power Supply: Ensure that the fan is receiving power. Use a multimeter to test the voltage at the fan's connection point. If there's no voltage, there could be an issue with the fan's wiring or the control board.
Inspect the Fan Blades: Examine the fan blades for any physical obstructions or debris that might be preventing it from spinning freely.
Test the Fan Motor: Disconnect the fan motor from the power supply and use the multimeter to check for continuity across its terminals. If there's no continuity, the motor may need replacement.
Inspect the Capacitor: The fan motor might have a start or run capacitor associated with it. Test the capacitor using a multimeter to ensure it is functioning correctly.
Check the Fan Relay: If your air conditioner has a fan relay, test it to see if it's functioning as expected.
Thermostat Check: Verify that the thermostat is set correctly and is signaling the fan to run when needed.
Regarding the number of times a faulty evaporator fan can occur before the system fails completely, it's difficult to give a specific number. The frequency and extent of failures depend on various factors such as:
- The age and condition of the air conditioning unit.
- The quality of the components used in the unit.
- The maintenance history of the unit.
- Environmental factors and operating conditions (e.g., extreme temperatures, dust, humidity).
If you notice any issues with the evaporator fan or any other components in your air-conditioning unit, it's essential to address the problem promptly. Neglecting regular maintenance and failing to fix faulty components can lead to increased wear and tear on other parts of the system, potentially causing more significant failures or even damaging the compressors. Regular maintenance by a qualified HVAC technician can help identify and address issues early, reducing the risk of system failure and extending the lifespan of your air conditioner.