Table of Contents
Your Dirty Air Filter is Causing the Furnace to Blow Cold Air. It sounds too easy to be true, but if your filter is dirty, it won’t allow air to pass through it. When this happens, even when the fire is off, the blower will continue to blow air through your house, but there’s nothing heating it.
Why is my furnace blowing air when its off?
If you have a heater blowing cold air instead of hot, your thermostat could be set incorrectly. When looking at your thermostat settings, ensure the switch is in the ‘Auto’ position. If it’s switched to the ‘On’ setting, the furnace’s fan will still blow air even when the unit is off. This can lead to some problems.
Why won’t my furnace shut off?
If your furnace won’t turn off, the easiest issue to fix is your thermostat. A furnace that is working hard to keep a high temperature, especially when it’s extra cold outside, can seem to run continuously. The second common thermostat problem is the fan switch. Your fan can be adjusted manually from your thermostat.
How long should fan run after furnace shuts off?
In normal operation, your furnace blower fan should come on 1.5 to 3 minutes after your thermostat calls for heat and should turn off several minutes after the heating cycle ends. Your blower should run constantly until the heating cycle ends.
Why is my fan running when my thermostat is off?
If the fan is the only thing running when the AC unit isn’t, there may be a faulty relay switch prohibiting the settings on the thermostat from being communicated to the fan. Another cause could be a wiring issue or a short circuit preventing the system from recognizing the on and off signals.
How do you reset a furnace after overheating?
How to Reset Your Furnace Turn down the thermostat to its lowest setting. At the circuit breaker, turn off the power to the furnace. If this is a gas furnace, turn off the gas supply at the valve for the main gas pipe, but leave the pilot’s gas supply on. If the pilot light was out, light a match to relight it.
Why is my furnace not blowing out hot air?
Heater Not Blowing Warm Air Because of Thermostat Settings. Make sure you check the thermostat which controls your HVAC system. If your thermostat is set correctly and your heater is still not coming on, you may have a faulty thermostat. If these fixes do not work, a call to an HVAC professional is in order.
What do you do when your furnace keeps running?
What you can do if your furnace won’t stop running: Check the thermostat setting. Inspect the air filter. Look into weatherizing. Check your ductwork. Check the vents. Check the thermostat. When you need heating equipment installation, maintenance and repairs, trust P.
What does it mean when your furnace keeps running?
When a furnace runs constantly, it probably means that something is dirty or clogged. But if the furnace fan continues to blow, there could be an electrical problem between the thermostat and the furnace or air blower, which requires a professional repair.
Why is my furnace blowing cold air and won’t shut off?
If the flame rod is covered in dirt or grime, it can cause the burner to shut off. As a result, the heater will start blowing cold air, or it may quickly cycle between warm and cold. Fortunately, this issue can be resolved by cleaning the flame sensor.
How do you reset a furnace fan?
How to Find and Reset your Furnace Motor Blower Step 1: Turn off the power to the furnace. Step 2: Remove the blower compartment cover. Step 3: Make sure the blower is completely cooled off. Step 4: Locate the reset button. Step 5: Press the button in (assuming that this is your issue and that the button has popped).
How much does it cost to run furnace fan all the time?
Therefore, the fan uses about 360 kWh per month in the ON mode. The average kWh in the US costs about $0.12 so it costs about $43 per month, or about $520 per year, to run a fan continuously.
Is it OK to run furnace fan constantly?
Running your furnace fan all the time isn’t exactly a bad thing. In fact, there’s no need to worry about the fan wearing out or breaking down because it’s designed to run continuously, and there’s an array of benefits connected to this.
How do you fix a fan that won’t turn off?
Steps To Fix a Ceiling Fan That Won’t Turn Off Step 1: Rule Out the Remote Control First. Step 2: Try the Switch in the Room. Step 3: Take a Look at the Chain. Step 4: Disconnect the Power to the Room. Step 5: Analyze the Internal Components of the Fan.
Do all furnaces have a fan limit switch?
Fan/Limit switches are used on all types of building heating furnaces. CLICK HERE to see a CLOSE-UP [image] of the FAN OFF, ON, and HIGH LIMIT OFF factory settings on this fan limit control. 1- FAN OFF: the low temperature at which the furnace blower fan will STOP to prevent blowing cool air onto room occupants.
How can I tell if my furnace is overheating?
Signs of Furnace Overheating The Odor. This is the most common and obvious sign of furnace overheating. Frequent On-Off. Another giveaway of furnace overheating is that the furnace may turn on and off again and again. Noisy Furnace. Restricted Airflow. Short Cycling. End of Lifecycle. Dirt Deposits.
Why is my furnace overheating and shutting off?
If your furnace keeps shutting off, it could be due to low airflow. There are several indirect issues that cause low airflow. Dirty Air Filters. If you don’t change your air filters often enough, the filters will become dirty and clogged, which means the heat exchanger retains heat and eventually causes it to overheat.
How do you know if your furnace is overheating?
Watch for the following signs that indicate your furnace is overheating. A constant burning aroma. A strange humming noise. The furnace turns off before finishing a cycle.
