Why is my furnace not responding to thermostat?

When a furnace is not responding to a thermostat, there is either a problem with the heating unit or the actual thermostat. Lack of power to the thermostat, wrong settings, and outdated software might be to blame, as well as faulty wiring, a tripped breaker, and a dirty furnace filter.

Why is my furnace running but not igniting?

If your gas furnace initiates the start cycle but does not fire up, it’s likely because of a faulty, damaged, or dirty ignitor/sensor. This is a very common furnace problem—you can try to clean the sensor and replace the ignitor.

How do you know if your furnace ignitor is bad?

Your furnace won’t run: The most obvious sign that your ignitor is bad is that it won’t ignite, and this generally manifests itself in your furnace failing to run when you activate it. One word of caution, though: this can also be caused by other issues, some of which are electrical.

What are the symptoms of a failing thermostat?

Thermostat failure symptoms that you should know

• High temperature readings. The main symptoms of a failing thermostat are related to engine overheating.
• Erratic changes in temperature.
• Leaking coolant.
• Increased fuel consumption.
• Unusual noises.

What would cause a thermostat not to work?

There simply may not be any power going to your thermostat. This could be caused by a poor connection, blown fuse, dead batteries, or a tripped circuit breaker. If all of these areas look good and your unit should be receiving power, the issue lies elsewhere.

How often should furnace ignitor be replaced?

about four to seven years
On average, furnace ignitors will last about four to seven years. This depends upon how well maintained the system is. After the seven-year mark, you should replace it. The Furnace itself can easily last you for 20 years or more with proper maintenance.