Why Don’t People Do This Before Calling an HVAC Tech?
A video on YouTube. In DIY & Home Repair, a Krater category.
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A DIY guide on how to troubleshoot and fix an HVAC air conditioning system that is not cooling, using a multimeter and simple checks for thermostats, water indicators, fuses, wiring, breakers, filters, condensers, and capacitors.
From the video
Answers: How do I troubleshoot and fix my AC when it's not cooling?
- HVAC troubleshooting
- Thermostat troubleshooting
- Multimeter voltage testing
- AC capacitor testing and replacement
- AC condenser coil cleaning
- Air filter replacement
What it concludes
- A blank thermostat screen can often be fixed by simply replacing its AA batteries.
- A healthy thermostat voltage reading should be between 24 and 28 volts AC.
- A proper Delta T (the difference between return and supply air temperature) should range between 16 and 22 degrees Fahrenheit.
- Flickering the AC service disconnect box off and back on can sometimes reset the system.
- Dirty outdoor condenser coils reduce cooling efficiency and lower the Delta T.
- Testing a capacitor with a multimeter is the best way to determine if a bad capacitor is causing the AC not to cool.
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