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HomeRepair HelpFurnace RepairFurnace has poor temperature control Repair
Furnace has poor temperature control
01 - Furnace Air Filter
Check and replace the furnace air filter at least twice a year, more often in dusty/dirty environments or if there is a pet in the home. A clogged air filter will greatly reduce the air flow of the furnace which can result in reduced heating and cooling throughout the home.
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Highly Likely
02 - Clogged Air Filter
If the air filter is clogged, air cannot flow properly through the home's venting system. This greatly reduces the heating/cooling capacity of the furnace blower. The air filter should be checked and replaced at least twice a year, more often in dusty/dirty environments. Refer to owner's manual for guidance.
Less Common
03 - Register is Closed or Only Partially Opened
Some heat registers have adjustable louvers that allow the air flow to be restricted or shut off entirely. This would be used to cut off the air flow to a room that isn't being used or to restrict air flow to one room so more air will flow to another. If the air louvers are closed off or not adjusted properly it will be difficult to maintain the desired temperature.
Less Common
04 - Furnace Wifi Thermostat
The WiFi thermostat has electrical contacts that control the power supply to the furnace. If the contacts in the thermostat fail, the furnace may not turn or may turn on intermittently. To determine if the thermostat is defective, use a multimeter to test it for continuity. If the WiFi thermostat does not show proper continuity, replace it.
Less Common
05 - Furnace Wall Thermostat
The wall thermostat has electrical contacts that control the power supply to the furnace. If the contacts in the thermostat fail, the furnace may not turn or may turn on intermittently. To determine if the thermostat is defective, use a multimeter to test it for continuity. If the wall thermostat does not show proper continuity, replace it.
Less Common
06 - Clogged Blower Wheel
Over time the blower wheel can become clogged with dust and debris. This will greatly affect the air flow circulating throughout the home. You can try cleaning the blower wheel with compressed air or with a soft bristle brush. Be sure to shut off power to the unit before attempting to clean the blower wheel. Use caution when trying to clean the blower wheel as the fins are sharp and can be easily damaged. If the blower is damaged it will need to be replaced.
Less Common
07 - Air Duct Not Secured or Sealed Properly
Some heat registers have adjustable louvers that allow the air flow to be restricted or shut off entirely. This would be used to cut off the air flow to a room that isn't being used or to restrict air flow to one room so more air will flow to another. If the air louvers are closed off or not adjusted properly it will be difficult to maintain the desired temperature.
Uncommon But Possible