When you hear your heating system running, but your house doesn’t warm up it can be extremely confusing and frustrating. You don’t want to dawdle while your home gets chillier and chillier, especially as the cold days and even colder nights settle in. Today, we at Hal Mechanical would like to take the opportunity to discuss why the heating system may be running but giving the heat you need.
Trouble with the Thermostat
The problem isn’t the furnace at all in some cases. The thermostat getting accidentally knocked and it set the HVAC system to cool instead of heat can happen from time to time. Cold air keeps blowing out of the vents if there’s a fan switch set to “on” instead of “auto.” you can open the panel and blow gently to dislodge it if there’s dust inside the thermostat panel causing trouble. Batteries need to be changed once a year usually, so if you suspect they are dying, change them out. Also, because there’s another source of heat too close to it, like a space heater or cooking appliance, the thermostat is correctly reading a high temperature as well.
Clogged Air Filters
It can make it hard for any air to flow through when an air filter is packed with dust and debris, stopping up that warm blast that you’re accustomed to feeling from your heat vents. A clogged air filter can cause the furnace itself to overheat, which will trip the safety controls and prevent the furnace from continuing to heat up. Cleaning or replacing the air filter is a good first step to see if you can resolve your problem yourself if either situation is concerning.
Gas Supply Valve is Closed
You can easily check this yourself if you have a gas furnace, and you think there’s any chance someone might have shut off the gas. While repairs are done, gas supply valves are sometimes closed. It’s off if the gas valve handle is perpendicular to the pipe. It is on if it’s parallel to the pipe.
Issues in Air Ducts
There could be a chance that the ductwork leading to the cold vent has been closed. The dampers (that’s the term for the handles on the front panel) will be parallel to the duct itself when they’re open. The duct is closed if the dampers are perpendicular. Duct repair might be necessary you see anything along those lines other duct issues include damage and leaks.
Furnace Pilot Problems
There is an actual pilot light that makes a continuous flame in older gas furnaces. If the gas is safely back on now so you can relight the pilot, it’s a good idea to call your gas company. The pilot may have gone out because the gas was turned off for maintenance or because of an emergency, and your gas company can confirm the cause and let you know. It’s time for a technician to assess the situation if your pilot just won’t stay lit. It may be that there’s something wrong with the ignition system or the thermocouple. A professional in heating system repair will need to address other pilot problems, such as with the electronic ignitor or flame sensor in a newer gas furnace