Payne
Low Heat Output / Underfiring
Furnace runs but house never reaches set temperature; supply air feels only mildly warm.
Advertisements
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.
Advertisements
Possible Causes
Low gas pressure, incorrect orifices, partially closed gas shutoff, dirty burners, heat exchanger bypass air leaks, incorrect blower speed (too high)
How to Fix / Troubleshooting
Safety first: Gas pressure adjustments must be performed by a licensed technician.
- Check thermostat and setpoint: Confirm thermostat is set correctly and not in an energy-saving mode.
- Inspect gas shutoff: Ensure the appliance gas valve handle is fully open.
- Clean burners: Remove and clean burners to ensure full, even flame.
- Check blower speed: If blower is set to a very high speed, air may feel cooler. Adjust to the recommended heating speed per the Payne installation instructions.
- Have gas pressure verified: A professional should measure and adjust manifold pressure and confirm correct orifice sizing.
Advertisements
Repair Difficulty
Hard
4/5
Required Part
Burner Orifices
Check Price on Amazon
We may earn a commission from links on this page.
Advertisements