Repairing Your Short-Cycling Furnace

Short-cycling furnaces are a common issue faced by many homeowners. If you own a furnace that is turning on and off at frequent intervals may be suffering from short cycling, resulting in inefficient heating and increased energy bills. This issue is common, but there are some tips to help with addressing this routine issue. 

Tip: Check The Air Filter

The overall conditions of your system's filters play a crucial role in maintaining the efficiency of your furnace. They remove particles from the air before it passes through the system, which can help ensure that your furnace operates at its best.

When air filters become dirty or clogged, they restrict airflow into your furnace. As a result, your system struggles to draw in enough air to maintain proper temperature levels within your home. This can lead to overheating within the unit, causing it to shut down prematurely. Regularly inspecting and replacing your air filter is essential in preventing this issue.

Tip: Inspect The Thermostat

Thermostats play a significant role in controlling when your furnace cycles on and off by monitoring indoor temperatures and communicating with your heating system accordingly.

A faulty or otherwise malfunctioning thermostat may cause temperature readings that trigger unnecessary on-off cycles for your heating unit. Often, these thermostat issues stem from either improper placement or internal faults with the thermostat. If the issue is with the thermostat itself, replacing it might be an effective and affordable repair.

Tip: Evaluate The Flame Sensor

The flame sensor is an essential safety component within gas furnaces that detects an active flame during operation. If the sensor fails to verify a flame exists, the sensor signals the furnace to shut down. This prevents the release of gas into your home.

A dirty or malfunctioning flame sensor may fail to detect a flame, even when it is present. This leads your furnace to shut down prematurely, causing short cycling issues. Inspecting and cleaning the flame sensor can help resolve this problem, but there may be times when replacing it is necessary.

Tip: Test The High-Limit Switch

The high-limit switch monitors the temperature within your furnace's heat exchanger, shutting down the system if temperatures exceed safe limits. This safety feature prevents overheating and potential damage to your heating unit.

If the high-limit switch is malfunctioning, it may cause your furnace to shut down prematurely even when temperatures remain within acceptable levels. Testing and repairing or replacing a faulty high-limit switch can help restore proper function to your heating system. However, this is a fairly advanced repair that requires the services of a professional heating repair contractor.

Reach out to a heating contractor to learn more.