Question 1

?What are the signs of a faulty gas furnace ignitor, and how can it be tested to confirm it is defective

Accepted Answer

Signs of a faulty gas furnace ignitor include the furnace not producing heat, the ignitor not glowing, and unusual noises during the ignition process. To test the ignitor and confirm it is defective:

Visual Inspection: Check the ignitor for visible cracks or damage. A damaged ignitor often indicates it needs replacement.
Continuity Test: Use a multimeter to test for continuity. Disconnect the ignitor from the power source and place the multimeter probes on the ignitor terminals. If the multimeter shows no continuity (an open circuit), the ignitor is faulty and needs to be replaced.
Voltage Test: Check the voltage at the ignitor terminals. If the correct voltage is present but the ignitor does not glow, it indicates a faulty ignitor.
Faulty Igniter: Check the igniter for visible cracks or damage. Use a multimeter to test for continuity. If the igniter is damaged or lacks continuity, it should be replaced.
Malfunctioning Control Board: Inspect the control board for any signs of burnt components or loose connections. If the control board is suspected to be faulty, testing it with a multimeter can confirm if it’s sending the correct signals to the igniter and gas valve.
Gas Valve Problems: Ensure the gas valve is receiving the correct voltage from the control board. If the valve is not opening, check for obstructions or replace the valve if it is defective.

Question 2

?How can a technician troubleshoot a gas furnace ignitor that fails to ignite, and what steps should be taken to resolve the issue

Accepted Answer

To troubleshoot a gas furnace ignitor that fails to ignite, a technician can follow these steps:

Verify Power Supply: Ensure the furnace is receiving power by checking the circuit breaker and any fuses. Reset or replace as needed.
Inspect the Ignitor: Perform a visual inspection for any visible damage. Use a multimeter to test for continuity and voltage at the ignitor terminals.
Check the Flame Sensor: Ensure the flame sensor is clean and free from buildup. Clean it with fine sandpaper if necessary. A dirty sensor can prevent the ignitor from lighting.
Examine the Control Board: Inspect the control board for any signs of damage or burnt components. If the control board is not sending the correct signals, it may need to be replaced.
Review Safety Switches: Check all safety switches, including the pressure switch and limit switches, to ensure they are functioning correctly and not interrupting the ignition process.
By following these steps, a technician can identify and resolve the issue preventing the gas furnace ignitor from working, ensuring the furnace operates safely and efficiently.

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