Miller
Burners Not Igniting
Furnace runs but produces no heat; blower operates normally, but supply air is cool.
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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
Closed manual gas shutoff valve, Failed hot surface ignitor, Faulty gas valve coil, Broken ignitor wiring harness
How to Fix / Troubleshooting
Safety: Turn off electrical power and gas before servicing. If you smell gas, do not attempt repairs—evacuate and call the gas utility.
- Verify thermostat call: Ensure the thermostat is set to HEAT and above room temperature.
- Check gas valve position: Confirm the manual gas shutoff near the Miller furnace is parallel to the pipe (open). If perpendicular, turn it to open.
- Observe ignition sequence: With panels in place, restore power and call for heat. Look through the sight glass to see if the ignitor glows. If it does not, test and replace the hot surface ignitor.
- Test gas valve: If the ignitor glows but burners do not light, measure 24V at the gas valve during ignition. If voltage is present but no flame, replace the gas valve. If no voltage, suspect the control board.
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Repair Difficulty
Medium
3/5
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