Nefit fault code 3C
Fault code 3C on a Nefit boiler (including EcomLine) means: Appliance does not start, there may be an open circuit in the electrical circuit, check that the connection (pink / pink or, with the old cable colours, brown-white / pink) in the wiring harness under the UBA is not loose. Reset the appliance once. If the code comes back, a part is usually faulty.
After a safety alert (gas, flue gas, combustion), reset no more than once and call in a certified gas engineer. If you smell gas, call your national gas emergency number or 112 immediately.
Cause
Fault code 3C on a Nefit boiler indicates: Appliance does not start, there may be an open circuit in the electrical circuit, check that the connection (pink / pink or, with the old cable colours, brown-white / pink) in the wiring harness under the UBA is not loose. Check the UBA by temporarily connecting another UBA..
Applies to
Nefit EcomLine, HR 11 Economy, HR 22, HR 22 Classic, HR 22 Excellent, HR 30 Excellent, HR 43, HR 43 Classic, HR 43 Excellent.
Fault code 3C on other Nefit series
The same code does not mean the same thing on every series. Check the rating plate to see which series you have:
- 3C on EcomLine, HR 30, HR 30 Classic: Appliance does not start, there may be an open circuit in the electrical circuit.
Matching parts
Nefit parts are available from Instalpunt; shipping to EU countries from €12.95 (€16.95 for more distant countries), usually 3–5 working days.
Parts per Nefit-series: ProLine (NxT) · TrendLine (II) · EcomLine · TopLine.
This message does not point directly to one faulty part. These are the parts that most often fit this appliance:
- Nefit fuse holder UBA 2 pcs for EcomLine and TopLine € 20.26
- Nefit control sensor for EcomLine € 73.18
- Nefit glow plug € 112.38
Fix it yourself or call an engineer?
Always consult the manual for your appliance and work safely. If in doubt or if the fault comes back, call in a qualified professional. A question about a part? Write to us at info@instalpunt.nl.
Frequently asked questions
What does Nefit boiler fault code 3C mean?
Appliance does not start, there may be an open circuit in the electrical circuit, check that the connection (pink / pink or, with the old cable colours, brown-white / pink) in the wiring harness under the UBA is not loose. Check the UBA by temporarily connecting another UBA..
How do I fix fault code 3C on a Nefit boiler?
First check the cause described above. Then restart the appliance using the reset button. If the message comes back, a part usually needs replacing or the fault needs to be repaired by a qualified professional.
Which parts do I need for Nefit fault code 3C?
That depends on the exact cause. In the Nefit parts overview at Instalpunt you will find the current price and stock for each part.
Can I fix fault code 3C myself?
You can reset the appliance and check things like the water pressure or settings yourself. Work on gas-carrying parts must be left to a certified gas engineer.
All Nefit boiler faults and codes at a glance →