E12
Cointra Multiple Ignition Failure Lockout

Furnace shows E12 and locks out, often after several failed ignition attempts.

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

Persistent gas supply issue, Severely dirty burner, Incorrect gas type or pressure, Faulty flame detection circuit

How to Fix / Troubleshooting

Safety: Turn off gas and power. Do not repeatedly reset a furnace that fails to ignite, as unburned gas can accumulate.

Steps:

  • Reset once: After waiting 5–10 minutes for any gas to dissipate, reset the furnace according to the Cointra manual. If E12 returns, stop resetting.
  • Check gas supply: Confirm that the gas shutoff valve is open and that other gas appliances are functioning normally.
  • Inspect burner and electrodes: Clean the burner ports, ignition electrode, and flame sensor as described in other entries.

Professional help: A technician must verify gas type (natural gas vs LPG), inlet pressure, burner settings, and flame signal. Do not attempt to adjust gas regulators or orifices yourself.

Advertisements

Repair Difficulty

Hard 4/5

Required Part

Main Burner Assembly
Check Price on Amazon

We may earn a commission from links on this page.

Advertisements