January 28, 2021

Whether you are using Natural Gas, Oil Furnace, Electric Ignition, or Propane, some problems are just common across all types. In this article, we will discuss the most common furnace problems and furnace repair.

Most Common Furnace Problems

Heater not working/Thermostat not working

There are several reasons why your heater is not working. First is you need to check if the thermostat is working. A busted fuse, low battery or a faulty electrical circuit may cause your thermostat to malfunction. A faulty thermostat will not be able to send the correct signal to your heating system. This will result to your heater not working properly.

Good news is that thermostat replacement usually solves the problem.

Heater working but not enough heat

Usually, thermostat settings adjustment can solve this problem. Check if your thermostat is properly set to “heat” at the right temperature level.

If your thermostat is working perfectly, next step is to check your vents. Make sure that nothing is clogging up the air flow. It is also important to ensure that your air filters are cleaned/replaced regularly. A clean filter will not only help with the airflow, but will also prevent your thermostat / sensor from not working.

Furnace Consistently Turns On and Off (“Short-cycling”)

There are several possible reasons why your furnace turns on-off continuously. It may be because of the following:

  1. Faulty Thermostat – if your thermostat is faulty (either it has low battery, or faulty circuitry), it will cause malfunction to your whole system. If battery replacement does not solve the problem, call a professional to get it replaced/fixed.
  2. Thermostat location – Your thermostat has sensors that will read the temperature of the room/space. If your thermostat is located near a heat source, it will cause your thermostat to read the temperature erroneously, which will cause your furnace to turn on/off
  3. Blocked/clogged airflow – if the airflow is blocked or clogged, it may cause several problems to your system, eventually causing it to short-cycle. Make sure that your air vents are open, your blower wheel is clean and your air filter is replaced.
  4. Faulty flame sensor – a flame sensor is a safety mechanism that ensures that when furnace is not in use, no gas will flow through your air vents. The flame sensor detects if there is flame within our furnace. If none, it will turn your furnace off. If your sensor is corroded, or is dirty, the flame sensor will not register any heat which will cause your system to shut down.

Gas Furnace Blower Runs Continuously

A furnace that continuously blows air may be a sign that it needs a repair. First, check your furnace settings. If it is set in “continuous fan”, try turning it off then on and observe. Sometimes, adjusting the setting does the trick.

If this does not solve the problem then, you might have a problem with the limit control switch. Contact your professional to have this checked.


Noise can come from anywhere and can be caused by anything. While others say that you can DIY, we do not suggest it. As your safety is more important than anything, call a professional to have this checked and fixed.

When is it the best time to call a technician for furnace repair

Rule of thumb is, unless you are a professional yourself, do not DIY. Furnaces have lots of components, that if not done properly, may cause costly repair and unnecessary risk. We highly recommend you to call your service professionals as soon as possible for the following urgent repairs:

  1. Gas leak or any problem with Gas Furnaces – this is a no brainer as gas leaks are very dangerous and may cause huge damage to your family and property. If your gas furnace is short-cycling, is completely not working, or is emitting gas through the vents, call professionals immediately.
  2. Faulty Sensors – if resetting the circuit breaker does not work, it may be time to replace your sensors. Call a repair technician to do the replacement for you.
  3. Furnace Noise (grinding, rattling) – Any noise, if left unchecked, can turn into a costly repair.
  4. Electrical problem – any electrical problem (pilot lights, sensors, etc.) requires a professional service. DO NOT DIY any electrical repair.

About Better Home Service

Your safety is our priority. We, at Better Home Service, make sure that your heating system works properly to avoid any costly and damaging repairs to your property. We offer quality, affordable and reliable HVAC services with 24/7 assistance. Contact us now for questions or to schedule your appointment.

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