The cold winter months begin, and you are spending beautiful time with your family at your warm and cosy home, but suddenly you find that your furnace starts blowing cold air, it will definitely make you uncomfortable and worried.
Life doesn’t always go as planned and our appliances don’t always work as well, even if your furnace is fairly new, things can go wrong that cause this unpleasant surprise.
There could be multiple reasons why your furnace is blowing cold air. In some cases, you may be able to fix the problem yourself. But if you don’t figure out problems and need help, call on the professionals at Alliance Energy Source in the Markham area. We will help you get your furnace working properly again so that you and your family can be warm and comfortable.
Thermostat’s fan setting
The fan setting controls the blower, the part that circulates air throughout your home. If the setting it to ON means the blower will run 24/7 regardless of whether the furnace is heating the air or not, that’s why you get cold air sometimes.
Make sure your thermostat’s fan setting is set to AUTO, not ON. AUTO ensures that the blower will run only when the furnace heats the air.
Furnace’s air filter
Remember, a dirty filter blocks airflow over the furnace‘s heat exchanger, makes it overheat, and your furnace may start blowing cold air. And an overheating furnace may trip a high limit switch, causing the furnace burners to shut off so that the heat exchange doesn’t crack.
Relighting the pilot light with these following steps:
1. Turn your thermostat from HEAT to OFF.
3. To reset the switch, you have to open the furnace cover and access it, you should see there a knob with these 3 settings.
‘PILOT’ ‘OFF’ ‘ON’
First, turn the knob to OFF and wait 3-5 minutes, it will shut down the gas coming through the pilot. Thereafter, turn the knob to PILOT and press down the knob. Now you’re re-starting the flow of gas to the pilot.
4. As you press the knob, hold a lighter to the pilot opening until the flame lights.
5. Turn the knob to ON, and now your furnace should ignite.
6. Turn the furnace ON and back to HEAT and ensure that the temperature is set 5 degrees below the room temperature. You should be getting hot air now.
In case, the pilot won’t light or stay lit. At this point you should call our furnace technician for help.
Condensate line issue
If you have a high efficiency furnace and you see water polling around the furnace, then it might be a condensate line blockage, it is usually a PVC pipe which causes water overflow which kill switch to shut down the furnace to prevent water damage.
There could be common reasons for condensate blockage are dust, mold, dirt and sometimes ice. Just drain it out. Beside blockages, the condensate overflow caused any other problem which you cannot figure out. In that case, you need your professional at your door.
Alliance Energy Source is an expert and specialist in heating, air conditioning and air quality. We will be happy to answer your all queries—just give us a call!