Nefit fault code 0Y
Fault code 0Y on a Nefit boiler (including EcomLine) means: The central heating system and cylinder (if present) are not heated. 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 0Y on a Nefit boiler indicates: The central heating system and cylinder (if present) are not heated.
Applies to
Nefit EcomLine, HR 11 Economy, HR 22, HR 22 Classic, HR 22 Excellent, HR 30, HR 30 Classic, HR 30 Excellent, HR 43.
Fault code 0Y 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:
- 0Y on EcomLine, HR 11 Economy, HR 22, HR 22 Classic, HR 22 Excellent, HR 30: The central heating system is not heated sufficiently. Central heating water temperature is higher than set on the flow temperature knob or higher than the heating curve of the weather-compensated controller.
- 0Y on EcomLine, HR 11 Economy, HR 22, HR 22 Classic, HR 22 Excellent, HR 30: The central heating system is not heated; the cylinder (if present) gets too hot.
- 0Y on EcomLine, HR 11 Economy, HR 22, HR 22 Classic, HR 22 Excellent, HR 30: The central heating system gets (too) hot. The appliance restarts continuously. The cylinder (if present) is not heated.
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 siphon gasket per 5 pcs for EcomLine and TopLine € 22.22
- Nefit control sensor for EcomLine € 73.18
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 0Y mean?
The central heating system and cylinder (if present) are not heated.
How do I fix fault code 0Y 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 0Y?
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 0Y 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 →