Check to see if there is an LED that is on or is blinking a code in your furnace. If there is an LED then your furnace is on. If there's no LED then there should be a switch somewhere near where the furnace is that turns it on and off.
Pay attention to how often your heating system cycles on and off. Frequent cycling could be a sign of thermostat problems as it struggles to maintain the desired temperature. If the system stays on for extended periods without adequately warming the house then the furnace might be working inefficiently.
Standard thermostats: Enlist a friend or family member to assist, Position one person by the thermostat and one person by the furnace. Slowly turn the thermostat from off to heat and increase the temperature. Both the thermostat and furnace should make a sound.
If your thermostat has fresh batteries but suddenly lacks power, flashes, or isn't responsive to adjustments, it may need replacement. If resetting the thermostat doesn't resolve the problem, you may have wiring problems or faulty components causing your thermostat to not turn on.
In most cases, installing a new thermostat is a relatively simple do-it-yourself project that can result in improved comfort and convenience and one that can help you save energy.
Most home thermostats are located in a central location in the home, like a hallway so that the temperature sensed is an average of the total temperature in the home. In most cases the temperature sensor is inside the thermostat but not always.
Your furnace won't turn on. When a thermostat works properly, it allows you to turn on your HVAC system and change its settings. If you get no response from your heating system, it may mean that your thermostat is faulty. The thermostat doesn't acknowledge setting changes.
If your furnace turns on but no heat is produced, there may be a problem with the fuel supply or the ignition system. If something is stopping your furnace from receiving gas, there is no fuel to combust so the furnace will not create any heat. The furnace turns on but no heat comes out.
The heating, ventilation, and air conditioning (HVAC) system in your home is controlled by your thermostat. If your thermostat isn't working, your furnace, whole-house fan, and AC unit are probably not functioning correctly, either.
Replacing a Thermostat. You'll pay between $15 and $300 for the unit in addition to labor ($65 to $100 per hour) to replace an old thermostat with a new one. However, installing a brand-new thermostat is more involved and, therefore, more expensive.
Your thermostat controls your heater. On its own, your furnace or heat pump doesn't detect the temperature in the room. If it did, your house would always have a weird temperature because the devices are away from the center of your home.
If your furnace's problems continue, contact an HVAC expert. Also, if you notice discoloration when you check the pilot light, get professional help. If there are cold spots in your home, even though hot air is coming out of the air vents, the issue could be different from your furnace not working.
There are several reasons why your furnace may not turn on. The most common include a broken thermostat, gas line issues, clogged air filters, blocked ductwork, a tripped circuit breaker, and issues with the furnace itself.
If your thermostat won't turn on the heat in your home, change out the batteries and see if that fixes the problem. If not, your faulty thermostat could be the result of the following: A tripped breaker. Loose wiring.
You can typically just replace the outdated thermostat with a new thermostat – assuming the latter is compatible with your HVAC system. There are a few things you should know, however, when upgrading your thermostat.