York
No Heat Production
Furnace blower runs but air from vents is cold.
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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
Gas supply off, Ignition failure, Faulty gas valve, Broken ignitor
How to Fix / Troubleshooting
Safety: Turn off power and gas before inspecting burners.
- Check thermostat mode: Ensure it is set to HEAT, not FAN ONLY.
- Verify gas supply: Confirm the manual gas valve to the furnace is open and other gas appliances work.
- Observe ignition: Through the sight glass, see if the ignitor glows and burners light. If not, the ignitor or gas valve may be faulty.
- Professional repair: Gas valve and ignition system diagnosis should be done by a licensed technician.
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Repair Difficulty
Hard
4/5
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