With the exception of the filter, the furnace will most likely always be turned off before performing vehicle. Otherwise, the furnace might turn on unexpectedly. To ensure that you do not forget to replace the filter, replace an early thermostat with a digital one that tells you want to replace your filter. By regularly replacing the filter, the furnace will perform optimally. Every couple of months, vacuum the furnace to ensure clean. Try to vacuum any part of your furnace that can be obtained. Make sure that the furnace exhaust vent does donrrrt you have anything blocking the item. Check to find out the blower is powered by a V-belt with an electric motor. If it is, check the V-belt to determine whether it is cracking or frayed. If so, it should be replaced. If the belt moves more than an inch when its touched, it must be tightened. Unfortunately, when the furnishings is not working, the cause in the problem is not necessarily clear. If the furnace is not working at all, one or two a blown blend. Restore the circuit. The pilot light sometimes goes out. Can does, relight in which. If there's no gas, make sure that the gas valve towards the furnace opens all the way up. However, there are times when the pilot light will not work or will light, but will only stay lit in brief. If it won't light, the opening needs to be cleaned or pilot light button might need become depressed more. Can only lights up briefly, there may be an issue while using thermocouple. Tighten the thermocouple nut. If that doesn't work, the thermocouple is broken and needs staying replaced. Make sure the pilot flame is at least two inches the long-term. If the blower keeps going, look at the thermostat to determine if it is set to ON. Can is, it ought to set to A vehicle. Make sure the limit switch is set to stop-start riding. If the furnace is really noisy, it shouldn't is. Loud noises are an indication that that can either something damaged or the motor or blower needs lubrication. The lower belt might need to be adjusted to be tighter or looser. Sometimes, the access panel might be loose or the belts could be stuck or damaged. Replace anything that is damaged. A variety of problems can be caused by the burner being messy. Under these circumstances, always call a professional.