Step 1: Access the Control Board
Before performing any operation, be sure to cut off the power supply to the furnace first to avoid electric shock or damage to the equipment. After confirming the power failure, remove the inspection panel of the furnace.
Step 2: Visual and Odor Inspection
Without power on, first conduct a visual inspection of the furnace board, with a focus on:
• Burn marks
• Damaged components
• Loose or corroded connections
Step 3: Check Diagnostic Lights
Most furnace control boards will have one or more diagnostic LED indicator lights. After power-on, observe the status of the indicator light:
• Flashing: The number of flashes can be used to identify specific fault codes
• Solid on: May indicate an abnormal operating condition
• Off: May mean the control board is not receiving power or the control board itself has failed
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Use a voltmeter or multimeter to check whether the power supply is normally delivered to the furnace control board. It is important to confirm whether the input voltage meets the requirements of the manual.
Step 5: Test Thermostat Terminals
Under the premise of ensuring operational safety, it is possible to short-circuit the terminals of the temperature controller to check whether the furnace board can respond correctly.
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