A19
De Dietrich
Gas Valve Modulation / Calibration Fault
Boiler displays A19, burner output limited or locked out
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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
Incorrect gas valve calibration, faulty modulation coil, wiring fault between PCB and gas valve
How to Fix / Troubleshooting
Safety: Only a gas-safe technician should adjust or replace gas valves. Do not attempt DIY gas work.
- Reset boiler: Perform a reset and observe if the fault reappears immediately or only at high demand.
- Technician tasks: A professional must check gas inlet pressure, test the gas valve modulation signal, recalibrate if the model supports it, or replace the valve if defective.
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Repair Difficulty
Professional Required
5/5
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