Keeprite E6 Error Code

What does Keeprite E6 mean?

The IGC board displays 6 LED flashes to signal ignition failure or loss of the flame signal during a heating run. The IGC attempted ignition multiple times — typically three trials — and either could not establish a flame or lost flame signal after ignition. The unit locks out on ignition failure to prevent unburned gas accumulation.

Symptoms

• Burners light briefly then extinguish before the heat sequence completes
• IGC attempts ignition up to three times then shuts down
• IGC board LED flashes 6 times repeatedly after the lockout
• No heat output even though the inducer and hot surface igniter both energize

Common causes

• Oxide or contamination buildup on the flame sensor rod reducing microamp signal
• Defective or cracked hot surface igniter failing to reach ignition temperature
• Low inlet gas pressure preventing stable flame establishment
• Flame sensor lead disconnected, broken, or shorting to ground
• Manual gas shutoff valve upstream of the unit is partially closed

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Diagnostic steps

1. Clean the flame sensor rod

   Remove the flame sensor and lightly polish the sensing rod with fine steel wool or emery cloth to remove oxide buildup. Reinstall and verify the microamp signal is 2 μA or above during a flame-proving test.

2. Inspect the hot surface igniter

   Check the igniter for visible cracks. Measure its cold resistance with a multimeter; a reading outside the manufacturer's specified range indicates a failed igniter that must be replaced.

3. Verify gas supply pressure and shutoff valve position

   Confirm the manual shutoff valve upstream of the unit is fully open. Measure supply gas pressure at the inlet tap; pressure below 5 in. w.c. for natural gas prevents reliable ignition.

4. Inspect flame sensor wiring

   Trace the flame sensor lead from the sensor to the IGC board connector. Check for frayed insulation or loose terminals that would ground the signal and cause a false no-flame reading.

5. Reset the IGC and monitor ignition sequence

   Cycle power at the disconnect to reset the lockout. Observe the ignition trial: the igniter should glow, gas valve should open, and flame should light within the trial period. If flame establishes and then drops out, the flame sensor signal is still insufficient.

When to call a professional

If cleaning the flame sensor and verifying gas pressure do not resolve the 6-flash ignition fault, a licensed technician should perform a microamp flame signal test with a meter, verify gas valve operation with a manometer, and replace the igniter or sensor as needed. Repeated failed ignition attempts allow unburned gas to accumulate, so do not repeatedly reset the unit without addressing the root cause.