A19
De Dietrich
Frost Protection / Low Temperature Sensor Fault
Boiler displays A19, anti-freeze or low temperature protection 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
Faulty ambient or system temperature sensor on De Dietrich boiler, Incorrect parameter settings, Sensor wiring fault, Boiler installed in unheated area with extreme cold
How to Fix / Troubleshooting
Safety: Protect the boiler from freezing. Frozen water can rupture components.
Steps:
- Check location: If the boiler is in a garage or loft, ensure the area is frost‑protected and that pipes are insulated.
- Inspect sensor: Locate the ambient or system sensor used for frost protection and check its wiring and mounting.
- Verify settings: In the installer menu (for qualified persons), confirm frost protection is enabled and temperature thresholds are correct.
Professional help: Sensor replacement or parameter adjustment should be done by a competent technician.
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Repair Difficulty
Medium
3/5
Required Part
System Temperature Sensor
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