E12
NTI
Gas Valve Modulation / Control Fault
Boiler shows E12; may be labeled as gas valve error or modulation fault
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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
Defective modulating gas valve, Broken modulation coil wiring, Incorrect gas valve calibration, Control board output failure
How to Fix / Troubleshooting
Safety: Gas valve work must comply with local codes. If you are not licensed, do not attempt to adjust or replace the gas valve.
- Visual check: Inspect the gas valve body and wiring harness for damage, loose plugs, or signs of overheating.
- Connector reseat: With power off, unplug and replug the gas valve connector to ensure a solid connection.
- Do not adjust screws: Do not turn any adjustment screws on the NTI gas valve unless you are performing a combustion setup with proper instruments.
- Professional testing: A technician should measure modulation signal from the control board, check coil resistance, and perform combustion analysis. Replace the gas valve if it does not respond correctly.
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Repair Difficulty
Professional Required
5/5
Required Part
Modulating Gas Valve
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