Nefit fault code L 99
Fault code L 99 on a Nefit boiler (including BaseLine and EcomLine) means: Set required output %. Reset the appliance once. If the code comes back, a part is usually faulty. You can check the water pressure and settings yourself; leave work on gas-carrying parts to a certified gas engineer.
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 L 99 on a Nefit boiler indicates: Set required output %.
Applies to
Nefit BaseLine, EcomLine, SmartLine, TopLine Compact, Elite HRC 24 CW4, Elite HRC 30 CW5, HR 11, HR 24, HRC 24, HRC 24 CW3, HRC 24 CW4, HRC 25/CW4.
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 siphon gasket per 5 pcs for EcomLine and TopLine € 22.22
- Nefit ionisation pin + grommet for EcomLine € 44.43
- Nefit fuse holder UBA 2 pcs for EcomLine and TopLine € 20.26
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 L 99 mean?
Set required output %.
How do I fix fault code L 99 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 L 99?
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 L 99 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 →