For warm air heat blower units behave differently than hot water or steam heat systems. To avoid damage to the heat exchanger the air handler or blower unit will normally keep running for a minute or even a few minutes after the thermostat has stopped calling for heat.
Furnace Troubleshooting Ran Out Of Heating Oil Furnace Won T Start 2021 Guide Hvac Training 101
All of the blower fan diagnostic steps we gave earlier PRESUME that no one has recently changed any wiring or controls on the furnace or air handler.
. If the heating system does not start continue to STEP 2 below. For this case or if your blower fan or furnace fan wont start at all see FAN WONT START where we give 12 reasons why the fan wont run. Wrong Fan Control Wiring Watch out.
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