Overview
TroubleShooting
Problem | Probable Cause |
---|---|
Won't Start |
|
Won't Start - Buzzing Sound at AC Unit |
|
Furnace fan not turning on |
|
Water running around the outside of the furnace |
|
Fan on AC unit not turning |
|
Not Cooling |
|
Checking Start Issues
Bypass the Thermostat
With the power on, you can bypass the thermostat by pushing the plunger in to connect the 240v.
Listen for buzzing, etc...
if it buzzes, check capacitor.
Check Incoming Voltage
Check for 240 VAC on contact points.
Capacitors
- Start Capacitor (black)
- Dual Run Capacitor(grey)
Checking the Capacitor
A problem capacitor may shows signs that it is bad by bulging out. Check to see if the capacitor appears misshapen.
The capacitor has a rating on it. Capacity is written as HERMS capacity + FAN capacity.
ex. 35+4uF
Measure the capacity from common to what you are measuring.
ex. Fan measurement should show 4uF and Herms should show 35uF.
Checking the Condenser Fan
Spin the fan with a screwdriver to see if it moves freely. If it doesn't you may need to replace the fan motor. You can also try oiling the fan.
Compressor
Ac Units
Mark's Unit
Sears Model# 875.47270
MD: 3207-1 11A
References
Reference | URL |
---|---|
How Air Conditioners Work | https://servicechampions.com/how-your-air-conditioner-works/ |
AC Won't Start | https://www.youtube.com/watch?v=wzAA4dlp_70 |
AC Capacitor Fail | https://www.youtube.com/watch?v=C82HvbvP08E |