Thermia
Delayed Ignition / Burner Explosion Noise
Furnace makes loud banging or booming noises at startup.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Dirty burners, Misaligned burner orifices, Low gas pressure, Weak hot surface igniter on Thermia burner assembly
How to Fix / Troubleshooting
Safety first: Turn off power and gas. Do not continue to operate a furnace that booms at startup.
- 1. Inspect burners: Remove and visually inspect the Thermia burner assembly for rust, debris, or blocked ports.
- 2. Clean burners: Use compressed air and a soft brush to clean burner ports and crossover channels. Reinstall carefully, ensuring proper alignment.
- 3. Check igniter position: Confirm the hot surface igniter is correctly positioned to light the gas quickly.
- 4. Professional gas check: Have a licensed technician verify gas pressure and combustion. Do not attempt to adjust gas pressure yourself.
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Repair Difficulty
Professional Required
5/5
Required Part
Burner Assembly
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