Takagi Error Code 111: Ignition Failure
How to Fix Takagi Code 111
- Step 1: Ensure the main gas supply valve to the water heater is fully open.
- Step 2: Check other gas appliances in your home to see if they are working. If not, there may be a broader gas supply issue.
- Step 3: Visually inspect the vent for any obvious obstructions (leaves, snow, debris). Do not attempt to disassemble the vent.
- Step 4: If the gas supply is confirmed and the vent appears clear, contact a qualified HVAC technician to diagnose and repair the unit.
What Does Takagi Error Code 111 Mean?
Error code 111 on your Takagi tankless water heater signifies an ignition failure. This means the unit tried to start the burner but failed to detect a flame. Several things could cause this, but the most important thing is safety. Because unburned gas may be present, it's vital to address this issue promptly. The system locks out as a safety measure to prevent a dangerous buildup of gas. When the unit calls for hot water, the control board starts the fan, opens the gas valve, and sends a spark to the igniter. The flame sensor then verifies that a flame is present. If the flame sensor doesn't detect a flame within a specific timeframe, the unit shuts down and displays the 111 error code. This could be due to a problem with the gas supply, the igniter, the flame sensor, or the control board itself. Because this involves gas, it's best to leave diagnosis and repair to a qualified technician.
Common Causes of Takagi Code 111
- Gas supply interruption (main gas valve closed, low gas pressure)
- Faulty igniter (not producing a spark)
- Defective flame sensor (not detecting the flame)
- Blocked or restricted vent (insufficient air for combustion)
- Malfunctioning gas valve (not opening to allow gas flow)
- Failed control board
Applicable Takagi Models
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This error requires immediate attention from a licensed HVAC technician. Do not attempt repair yourself.
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