Nefit fault code 0H of =.H
Fault code 0H of =.H on a Nefit boiler (including EcomLine) means: The central heating system does not get hot enough. The cylinder is heated correctly. On the central heating side the appliance fires at low output only. 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 0H of =.H on a Nefit boiler indicates: The central heating system does not get hot enough. The cylinder is heated correctly. On the central heating side the appliance fires at low output only.
Fixing fault code 0H of =.H: step by step
- Note the exact code and the type of your appliance (see the rating plate).
- Check the water pressure (1.5–2 bar with the system cold) and that the appliance has power.
- Reset the appliance once. If the code comes straight back, do not keep resetting it.
- If the code comes back, choose the matching part below or have a qualified heating engineer take a look.
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 0H of =.H 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:
- 0H of =.H on EcomLine, HR 11 Economy, HR 22, HR 22 Classic, HR 22 Excellent, HR 30: The central heating system gets too hot, the cylinder (if present) is not heated.
- 0H of =.H on EcomLine, HR 11 Economy, HR 22, HR 22 Classic, HR 22 Excellent, HR 30: Domestic hot water from the cylinder is too cold at high draw-off or the hot water flow rate is too low.
- 0H of =.H on EcomLine, HR 11 Economy, HR 22, HR 22 Classic, HR 22 Excellent, HR 30: The central heating system gets hot when the cylinder calls for heat.
- 0H of =.H on EcomLine, HR 11 Economy, HR 22, HR 22 Classic, HR 22 Excellent, HR 30: Domestic hot water from the cylinder is too cold at high draw-off or the flow rate of hot water is too small.
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 € 21.07
- Nefit siphon gasket per 5 pcs for EcomLine and TopLine € 23.10
- Nefit control sensor for EcomLine € 76.11
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 0H of =.H mean?
The central heating system does not get hot enough. The cylinder is heated correctly. On the central heating side the appliance fires at low output only.
How do I fix fault code 0H of =.H 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 0H of =.H?
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 0H of =.H 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 →