Technician Working on Furnace

Furnace Not Working? Try These Troubleshooting Tips

You’d be surprised at the number of calls we’ve responded to that were quickly resolved by a little troubleshooting that the homeowner could’ve easily handled.

The next time your furnace is on the fritz, try these tips first.

Issue: Weak Airflow From Furnace

Change the filter: As a general rule, you should change the air filter in your furnace every 30 to 90 days. If you’ve neglected this task, the culprit could be a clogged filter.

  • Locate your filter - Depending on the furnace model, the filter is either inside the unit or it’s on the intake side, which looks like a grate on the wall or the floor.

  • Inspect it - Hold the filter up to a light. If you can’t see any light through the screen, it’s due for a replacement.

  • Replace it - Pay careful attention to the arrows on the filter. These indicate whether the filter should be installed face up or face down.

Issue: Furnace isn’t Producing Heat

Check the thermostat: Like all electronic devices, thermostats occasionally glitch.

  • Check the mode - It could be that someone accidentally bumped it to cooling mode. Be sure it’s set on heat and try adjusting the temperature up a few degrees to see if the furnace kicks on.

  • Check the battery - If the display screen is blank, try changing the batteries.

  • Check the connections - Does anything appear loose? Any frayed or cracked wires?

  • Open the panel - Blow out any dust or debris.

Issue: Furnace is Completely Down

Check your breakers: If the furnace isn’t responding to thermostat controls, your circuit breakers may have tripped.

  • Test the breakers: At the breaker panel, find the switch that controls the HVAC system. See if it was thrown to the off position. Flip it back on.

Bottom line: If none of these tips work, then you have a more complicated problem. Give Guaranteed Service a call at (732) 412-1134.