23 error code
ACV Kompakt HRE eco Solo 23 error code – S2 return-sensor fault
What does ACV Kompakt HRE eco Solo wall-mounted gas boiler 23 mean?
ACV documents display code 23 for the Kompakt HRE eco Solo 12, 18, 30 and 40 as: S2 return-sensor fault.
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 ACV Kompakt HRE eco Solo wall-mounted gas boiler 23 error code indicates aCV documents display code 23 for the Kompakt HRE eco Solo 12, 18, 30 and 40 as: S2 return-sensor fault. 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 fault LED flashes and the temperature display shows 23. The boiler may lock out, stop firing, or interrupt central-heating and connected hot-water-cylinder operation.
Common causes
The official table assigns this display value to the S2 return-sensor fault group. Check for an open circuit in the wiring and test S2.
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 23 and the exact Kompakt HRE eco Solo model. Check only visible system pressure, power, thermostat demand and external controls permitted by the operating instructions. Wiring, sensor, fan, ignition, gas-valve and combustion checks require a qualified engineer.
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 23 reappears, note when it happens and give that information to the service engineer.
Reset instructions
After the underlying fault has been corrected, press the reset key as described in section 8.1 of the official instructions. If code 23 returns, stop resetting and arrange professional diagnosis.
Applicable products and models
Kompakt HRE eco Solo wall-mounted gas boilerKompakt HRE eco 12 Solo; Kompakt HRE eco 18 Solo; Kompakt HRE eco 30 Solo; Kompakt HRE eco 40 SoloOfficial installation instructions, © 2016 ACV InternationalWhen to contact a professional
Contact ACV support or a qualified heating engineer when code 23 persists, returns after a permitted reset, or requires internal testing or component replacement.
Frequently asked questions
What does ACV Kompakt HRE eco Solo wall-mounted gas boiler 23 mean?
ACV documents display code 23 for the Kompakt HRE eco Solo 12, 18, 30 and 40 as: S2 return-sensor fault.
Can I fix ACV Kompakt HRE eco Solo wall-mounted gas boiler 23 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 23?
After the underlying fault has been corrected, press the reset key as described in section 8.1 of the official instructions. If code 23 returns, stop resetting and arrange professional diagnosis.
When should I arrange a repair?
Contact ACV support or a qualified heating engineer when code 23 persists, returns after a permitted reset, or requires internal testing or component replacement.