If the furnace is producing no heat, it's not likely there's an issue with the heating element so much as there is a problem with its supplementary systems. Tempstar furnaces are typically gas-powered models, though they rely on electronic regulators to make sure they work properly. These regulators are usually at fault. First, check to make sure that the furnace is receiving electricity and that the circuit breakers have not been tripped. In older houses, you may have to check the fuse box and replace a blown fuse. Make sure that the valve feeding the furnace with propane or natural gas is open and ensure that the pilot light has not gone out. If all these things are working properly, the thermostat is to blame. Make sure it's in "heat" mode and set it to a temperature above the room's current temperature. If the furnace doesn't turn on, the thermostat is broken and needs to be repaired by a Tempstar furnace product support representative.
Furnace Produces No Heat
Furnace Turns On and Off Frequently
If the furnace is coming on and off too often, it's because it has to work too hard to maintain the home's temperature. This may be because the furnace air filter is dirty, preventing adequate hot air from passing through and heating the home. Look at the filter. If it's discolored in any way, it needs to be replaced. The hot air from the furnace might not be getting to the rest of the house because of the blower motor. It's essentially a large fan set into the top of the furnace and receives the energy to turn from a fan belt. The fan should be oiled first; there will be oil induction ports on the exterior of the furnace. The fan belt should be inspected; make sure it's not frayed, it has good tension, and it has not jumped its rods. If any such problem exists, the belt should be replaced immediately.
Furnace Makes Odd Noises
There are three noises that are not normal for a Tempstar furnace. A high-pitched squeal may be the result of poorly oiled bearings or the blower motor's fan belt slipping. The fan belt should be tightened and lightweight oil poured into the Tempstar furnace's oil induction ports. Should the furnace make a rumbling sound when the gas burners are turned on, it means the burner is dirty from carbon deposits and should be removed and cleaned. If the furnace makes a rumbling noise when the burners are turned off, it means the pilot light is burning too hot. The amount of fuel reaching the pilot light should be reduced until the rumbling goes away.