October 27, 2019
Do you remember an evening last winter when you woke up in the middle of the night and you could see your breath? That is a sign your furnace is sputtering or not working at all and it’s time to troubleshoot now before the nights become colder again.
Why the furnace will not turn on
It sounds too easy but if the furnace won’t turn on, make sure the thermostat switch is set to HEAT and temperature is set to at least 5 degrees above the room’s temperature. You don’t want to pay for a service call if it’s something simple.
Furnace won’t stay on
A furnace that won’t stay cycled on and doing its’ duty is a frustrating problem. If it turns on, heats up and runs for a few minutes and then turns off before the target temperature is reached, it could a number of things. Check the thermocouple and the thermostat; also, be sure the blower motor is working and check for air restrictions.
The furnace blows cold air
If your furnace is blowing cold air, be sure the thermostat is not set to ON. This setting tells the fan to blow constantly and will blow cold air when the furnace isn’t heating.
The furnace won’t light
If the furnace won’t light at all, first check that the thermostat is working properly. Then verify that fuel source supply lines are open and working, and plenty of fuel is available. LP systems, for example, should have at least 25 percent of fuel remaining in the tank.
The furnace won’t shut off
If the blower fan will not turn off, be sure the thermostat is not set to ON. Switch it to AUTO and see if that helps. You could also have a relay switch problem. If the furnace burners won’t shut off, the temperature is set too high or you have a dirty air filter.
The furnace makes noise
A noisy furnace can result from an array of issues. Understand the cause first in order to apply a solution. A delayed ignition can make a loud whoosh; whistling noises are likely gaps in ducts; rattling could be loose panels.
The furnace smells
Some furnace smells are nuisances while others are danger signs. Burning smells often develop after the unit has not been run for a while. Overheating smells could be from internal components getting too hot. Sulfur smell means a natural gas leak and you should leave the house and call for help.
Who fixes heating systems?
When you need professional furnace repair, reach out to a trusted HVAC company in your area like Rowland Air. Our trained staff can diagnose your issue and recommend a speedy solution.