Nefit fault code 0H 203
Fault code 0H 203 on a Nefit boiler (including TrendLine) means: The boiler is on standby. 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 203 on a Nefit boiler indicates: The boiler is on standby.
Message 0H 203: what to do
- This is not a fault but a status message: the appliance is showing what it is doing right now.
- Wait until the appliance has finished (a venting or start-up programme usually takes a few minutes).
- If the appliance then shows a different code, or stays in this state, look up that code or reset it once.
Applies to
Nefit TrendLine, HRC 30 CW5, HRC 30 CW5 II, TopLine, Aquapower HRC 25 CW4, Aquapower HRC 25 CW4 II, Aquapower HRC 25 CW5, Aquapower HRC 25 CW5 II, Aquapower HRC 30 CW5, Aquapower HRC 30 CW5 II, Aquapower HRC 45 CW6, Aquapower HRC 45 CW6 II.
Fault code 0H 203 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 203 on EcomLine, Elite HRC 24 CW4, Elite HRC 30 CW5: Standby.
- 0H 203 on TopLine, Aquapower+ HRC 30 CW6, HR 45 II: The boiler is in standby.
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 automatic air vent € 27.18
- Nefit O-ring set three-way valve 8718600261 for TopLine and TrendLine etc. € 43.49
- Nefit three-way valve from December 2011 for TopLine and TrendLine etc. € 108.73
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 203 mean?
The boiler is on standby.
How do I fix fault code 0H 203 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 203?
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 203 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 →