Why does my HVAC blower not come on when I call for cooling?

Why does my HVAC blower not come on when I call for cooling?

Some also manage it during a cool call, but not all do. So when calling for cooling, the thermostat usually energizes both Y for cooling, and G to turn on the blower. Since you say the blower doesn’t come on for cool calls, or when the fan switch is moved to the ON position. That points to a problem with the “fan circuit”.

Can a blower fan be turned on in cool mode?

If the Y terminal is energized, it turns on the a/c outside unit, but not the blower fan. Typical thermostats will energize the G terminal when in cool mode, or when the fan is turned to manual “always on” mode. It sounds to me like the G terminal is not being energized.

Why does my blower fan not start when I spin it?

But yes in general if the motor will run when you give the blower fan a spin then usually the problem is the starting capacitor (if present) OR a bad start relay control switch.

Why does my air conditioner fan won’t start?

This article series describes in detail the testing and diagnosis of problems with air conditioning fans and with forced warm air heating blower fans found in the air handler or AHU. When the blower fan won’t start the problem could be something as simple as a blower compartment door that is not fully closed, or a clogged condensate drain.

Why is my AC unit buzzing but the fan is not spinning?

Oh, no—your air conditioner’s not working. You go outside to check the A/C unit, and it’s buzzing but the fan’s not spinning. What’s going on? You may have a bad capacitor. The good news is, it’s pretty easy to find out. A bad capacitor is a common A/C problem with a straightforward fix.

Why is my air conditioner not blowing cold air?

If a run capacitor malfunctions, your AC system may not start, or it might start but continue to run, possibly making a humming sound. Other signs the run capacitor has malfunctioned include slow or delayed start-up, system shut down, or the system not blowing cold air.

What to do if your AC fan won’t start?

Turn off the A/C unit and call in an HVAC technician to replace the capacitor as soon as possible. This is a quick and simple repair for a professional. If you leave the unit running, the fan motor will keep attempting and failing to start.

What to do if your car AC is not blowing?

Depending on what kind of car you have, it should be a pretty simple fix. The problem sounds like it is with your blower motor, not your AC system. Hopefully, the blower motor simply blew a fuse. Find your fuse panel and check the fuse for the “blower motor” or “vent fan” or something like that.

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Ruth Doyle