44
Tempstar
Flame Sensing Circuit Fault
LED flashes code 44; furnace may shut down unexpectedly or not start, often associated with flame sensing issues.
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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
Loose flame sensor connection, Corroded sensor terminal on Tempstar control board, Damaged flame sensor wire, Defective control board flame circuit
How to Fix / Troubleshooting
Safety: Turn off power and gas before working on the burner or sensor.
- Step 1 – Reseat flame sensor wire: Disconnect and reconnect the flame sensor wire at both the sensor and control board. Clean any corrosion from terminals.
- Step 2 – Inspect wire: Check the entire length of the flame sensor wire for cracks, burns, or pinched sections. Replace if damaged.
- Step 3 – Clean sensor: Remove and gently clean the flame sensor rod with fine steel wool. Reinstall securely.
- Step 4 – Inspect control board: Look for corrosion or burnt traces around the flame sensor terminal on the Tempstar control board. If damaged, replace the board.
- Step 5 – Verify operation: Restore power and gas, call for heat, and confirm that the furnace lights and stays lit without re-triggering the code.
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Repair Difficulty
Medium
3/5
Required Part
Tempstar Flame Sensor
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