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HVAC Troubleshooting Guide

HVAC Troubleshooting Guide

Why your Furnace/AC Isn’t Turning On
Choosing the Right Furnace Filter
How to Locate the Gas Shut-off Valve
A/C Isn’t Cooling – Freon
Carbon Monoxide – Furnace
A/C Maintenance Tips

Why Your Furnace / AC Isn’t Turning On

Outside AC unit not running?  Furnace won’t kick in on a cold morning? Here are a few things to check before calling ABC Company.

Step 1 – Getting Ready To Do The Job

  • Grab a small flashlight to help see in dark spaces.
  • Don’t be intimidated by the steps below.  If you’re not sure what to do, ABC Company is here to help.

Step 2 – The Things to Check

1. Make Sure the Thermostat Is Set Correctly

  • For AC: Make sure your thermostat is set to COOL.  Then, set the temperature setting to at least 5° below the indoor temperature.  If the AC is working, this will turn it on. Some thermostats have a 3-5-minute delay when you make a selection change, so don’t be alarmed if your AC doesn’t start immediately.
  • For Furnace:  Make sure the thermostat it set to HEAT and the temperature is set high enough to turn on the furnace.

TIP:  In the winter, if the thermostat is set to COOL, change it to HEAT.  This is a commonly forgotten step at the beginning of the heating season.

2. No Power

Both your furnace and AC need power to operate. If neither will operate, check for a blown fuse or tripped circuit breakers.  In older homes this is a fuse box while newer homes have a circuit panel. If it’s a fuse box, look for a blown fuse. On a circuit breaker, look for a tripped circuit and flip it to “off” and then back to “on.”

TIP:  Most furnaces and boilers have a switch that looks exactly like a light switch, on or next to the equipment.  This switch must be in the ON position for the furnace or boiler to operate.  Sometimes it can be switched off accidentally.

3. When to Get Professional Service

If none of the home troubleshooting solutions seem to remedy the problem, there may be some component issues requiring a service call from ABC Company.

For more information on why your furnace or AC isn’t turning on, ABC Company is here to help.