Nefit fault code 4A 218
Fault code 4A 218 on a Nefit boiler (including ProLine and TopLine) means: The flow temperature sensor has measured a temperature higher than 105 °C. Reset the appliance once. If the code comes back, a part is usually faulty, often a temperature sensor. 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 4A 218 on a Nefit boiler indicates: The flow temperature sensor has measured a temperature higher than 105 °C..
Applies to
Nefit ProLine, TopLine, TrendLine, 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 4A 218 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:
- 4A 218 on EcomLine, Elite HRC 24 CW4, Elite HRC 30 CW5: The flow sensor has measured a central heating water temperature higher than 105 °C.
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.
For fault code 4A 218, the part involved is usually in the category: sensor.
Based on the cause, these original Nefit parts fit (always check the type number of your appliance):
- Nefit pressure sensor with click connection for TopLine and ProLine etc. € 74.49
- Nefit safety sensor for TopLine € 49.66
- Nefit flow/return sensor for Smartline basic and Topline € 37.90
Further reading on this cause
Other Nefit codes with the same cause
- 0Y 276 — The contacts of the flow sensor are open circuit
- 0Y 277 — The safety temperature sensor has measured a temperature higher than 95°C.
- 0Y 285 — The return sensor has measured a current central heating return water temperature higher…
- 1021 — Domestic hot water temperature sensor defective
- 1022 — The domestic hot water temperature sensor is defective
- 1065 — Pressure sensor defective or not connected.
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 4A 218 mean?
The flow temperature sensor has measured a temperature higher than 105 °C..
How do I fix fault code 4A 218 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 4A 218?
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 4A 218 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 →