What Causes Short Cycling?

When the furnace starts and stops frequently, it is call short cycling. This decreases the furnace’s efficiency and could be a sign of a serious furnace issue. However, the most common source of short cycling is a clogged air filter. Check the filter first, replacing it if necessary. If that doesn’t stop the short cycling, it could be one of the following problems causing it:

  1. Thermostat Location

If the thermostat has been poorly located, it can cause short cycling to occur. It should be placed away from drafts, effects of windows and air vents. To see if this is the issue, place something in front of the thermostat like a piece of cardboard. If the short cycling stops, it needs to be moved to a new location.

  1. Overheating

Many modern furnaces have a safety device that switches the burner off if the heat exchanger starts to overheat. This can also cause short cycling. If the heat exchanger is overheating, there’s a possibility of it being cracked, which should be repaired right away.

  1. Improper Furnace Size

Furnaces that are the wrong size for the home will short cycle trying to keep up with the desired temperature. To correct this issue, it will require a new system to be put in place that is the correct size. While expensive, it will save homeowners money on energy bills and keep the home at a more comfortable temperature.

Don’t live with a short cycling furnace. It could be increasing energy bills and not achieving the desired temperature. Continuing to let it short cycle could lead to lasting HVAC damage as well. Call Diamond Heating and Cooling if the furnace starts short cycling this fall and winter.

Also, be sure to schedule annual furnace maintenance. Check out Diamond’s Silver Club Membership and learn how to save on all things HVAC.

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