A19
Hoval
Configuration / Parameter Fault
Boiler shows A19, burner output limited, may indicate sensor calibration or parameter error
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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 commissioning parameters, Corrupted controller memory, Incompatible sensor configuration, Firmware mismatch
How to Fix / Troubleshooting
Safety: Only trained personnel should change service-level parameters.
- Check user settings: Ensure that heating curves, setpoints, and operating modes are correctly selected on the Hoval controller.
- Factory reset (if allowed): Some Hoval controllers permit a reset to default settings. Follow the manual carefully and note existing settings before resetting.
- Service menu: A Hoval technician can access the service menu to verify sensor assignments and system configuration.
- If configuration is correct but A19 remains, the controller firmware may need updating or the PCB replacing.
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Repair Difficulty
Hard
4/5
Required Part
Boiler Controller / Main PCB
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