33 error code
De Dietrich C 230 ECO 33 error code – Boiler sensor disconnected
What does De Dietrich C 230 ECO floor-standing condensing boiler 33 mean?
The main boiler temperature sensor is open-circuit or disconnected.
The code identifies the condition detected by the product; it does not always identify the failed component on its own. Confirm the full code and exact model before ordering parts or attempting a reset.
The De Dietrich C 230 ECO floor-standing condensing boiler 33 error code indicates the main boiler temperature sensor is open-circuit or disconnected. This guide explains what the code means, the symptoms and likely causes, the checks that are safe to make, and when to stop and arrange an authorised repair.
Symptoms you may notice
The control displays code 33 and identifies a problem with the relevant boiler temperature-sensor circuit. Heating operation may be stopped or restricted.
Common causes
A failed temperature sensor, damaged cable, loose or disconnected plug, short circuit, open circuit, or an implausibly low measured temperature.
Before you start troubleshooting
Use the display, rating label or product menu to confirm the exact model. Similar-looking codes can have different meanings across product generations and regions.
- Record the complete code before switching the equipment off.
- Check only user-accessible controls, filters and external connections described in the manual.
- Do not open gas, refrigerant, combustion or electrical compartments.
Troubleshooting steps
Record code 33 and the boiler model. The archived manufacturer instructions direct the technician to reset the control, check the sensor link and connectors, and replace the sensor if testing confirms it is defective.
Can you fix this error code yourself?
The safest next step depends on the exact model and the cause behind the code. External checks may help, but a returning fault needs professional diagnosis.
A successful reset is not proof that the underlying issue is fixed. If 33 reappears, note when it happens and give that information to the service engineer.
Reset instructions
Use the control reset only as described in the C 230 ECO operating instructions. If the code remains or returns, do not continue resetting the boiler.
Applicable products and models
C 230 ECO floor-standing condensing boilerC 230 ECOLegacy manual 300015144-001-CWhen to contact a professional
Arrange qualified De Dietrich service if the fault returns after one permitted reset or if sensor, wiring, connector or control testing is required.
Frequently asked questions
What does De Dietrich C 230 ECO floor-standing condensing boiler 33 mean?
The main boiler temperature sensor is open-circuit or disconnected.
Can I fix De Dietrich C 230 ECO floor-standing condensing boiler 33 myself?
Some external checks may be suitable for the user, but the result depends on the exact model and cause. Use the official manual and arrange service if the code returns.
Should I reset the product after code 33?
Use the control reset only as described in the C 230 ECO operating instructions. If the code remains or returns, do not continue resetting the boiler.
When should I arrange a repair?
Arrange qualified De Dietrich service if the fault returns after one permitted reset or if sensor, wiring, connector or control testing is required.