Is your furnace not starting up and maybe making a funny sound like it is trying to start up? Perhaps you have shut it off and then turned back on. Maybe you just turned the fan on and it works. You may be in need of a new induced draft motor or draft inducer motor. This motor is what creates a draft through the heat exchanger. Air and gas are drawn through the front of the furnace and conveyed to the flue connector. What you have is a whole assembly. In most cases the entire assembly is what gets replaced. In some rare cases you can replace just the motor which is cheaper but takes longer to do. When replacing the assembly it is important to replace the gasket that goes between the assembly and the heat exchanger manifold. The gasket is usually fiberglass or fire rated foam. Modern furnaces have this motor as well the circulating or blower motor. Out of the 2 motors, the inducer motor typically is the one that fails first. The bearings start to wear out making the operation noisier and eventually they fail and the motor stops turning. I have seen motors with noisy bearings run for a long time (years) and in other cases no increased noise is noticed before the motor fails.
The induced draft assembly is typically made of steel or metals such as the one in the picture.
They often develop rust and wear out. Replacing the draft inducer motor assembly is the only way your furnace will operate.
How much should I expect to pay to replace my draft inducer motor assembly?
Depending on the make and model expect to pay between $500 and $800 for residential gas furnaces. At Tobin you can count on us to tell you what the problem is and give you a fair reasonable price ti install a new draft induced motor.
Give us a call for a quote if you are in the Denver Metro area 303.893.5675
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A two stage furnace has 2 separate firing rates with the lower one operating at about 40% of the full rate. When your furnace kicks in it will start at the lower more efficient rate for 5 to 10 minutes. If your heat has not warmed up to where it was set during this time then the burner will switch to the higher firing rate to meet your heating needs. The 2 stage system is more efficient than a 1 stage furnace as the lower firing rate provides a better overall temperature by running the furnace more often at the lower rate. Thus, air is circulated more frequently which provides a more balanced room temperature throughout the home.
In many cases an upgrade from a basic 80% efficient furnace to a 2 stage is not a significant cost upgrade, usually around $300. These furnaces control the staging independent of the thermostat which works in most cases when people are not setting their set point back significantly. If you do set the temperature back to save energy it is better to upgrade to a furnace that the staging is controlled by the thermostat. These furnaces typically cost $600-800 more. In order to make it a true 2 stage, a 2 stage thermostat and additional wires need to be run. In cases when additional wires cannot be run there are thermostats available that although they are more expensive they can perform the furnace control over just 2 wires. There are also wireless thermostats that do the same they just are not wi fi capable.
The reason you need a 2 stage thermostat to control the staging is because when you set the thermostat back more than 3 degrees you want the furnace to fire in high stage to make up the 3 degrees quickly.
Most of the time your furnace is set to hold a given temperature for a long time for instance at night when you are sleeping. In this case, when the furnace gets a call for heat it only needs to make up a 1/2 to 1 degree and this is when the furnace will be in the low or first stage and give you longer run times for more even heating.