Zehnder fault code ‘Fil’ ‘tEr’ (of ‘tEr’ ‘Fil’)
Fault code ‘Fil’ ‘tEr’ (of ‘tEr’ ‘Fil’) on an Zehnder MVHR unit (including WHR) means: Internal filter is dirty. 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.
Gas, flue or flame fault? One reset is the limit; after that it is a job for a registered gas engineer. Smell gas: no switches or flames, open the windows, get out and ring your national gas emergency number or 112 from outside.
Cause
Fault code ‘Fil’ ‘tEr’ (of ‘tEr’ ‘Fil’) on an Zehnder MVHR unit indicates: Internal filter is dirty.
Fault code ‘Fil’ ‘tEr’ (of ‘tEr’ ‘Fil’): what to check before you call an engineer
- Write down the exact code and the full model designation from the rating plate; that is what we and any engineer will ask for first.
- Check that the appliance has power and that its circuit breaker has not tripped.
- Press reset once and give the appliance a minute. If the code returns straight away, stop there: repeated resets hide a real fault and can lock the appliance out.
- If the code comes back, pick the matching spare part below, or have a qualified heating engineer diagnose it first.
Applies to
Zehnder WHR, 950 Luxe, 960 Luxe, 930 Basic, 930 Luxe.
Matching parts
Zehnder parts are available from Instalpunt; shipping €9.95 to Austria, Denmark, Italy, Spain and Sweden and €12.95 to the other EU countries, free from €199, usually 3–5 working days.
For fault code ‘Fil’ ‘tEr’ (of ‘tEr’ ‘Fil’), the part involved is usually in the category: filter.
No single part is behind this code. These are the parts that most often fit this appliance:
Zehnder sensor WHR 950 fan € 47.08
Zehnder sensor WHR 950 Byp € 65.28
Zehnder display WHR920/950II/ 960 € 124.20
DIY or engineer: where the line is
Keep the manual at hand, switch off the power before you open a cover and stop at the sealed combustion section. Not sure which part you need? E-mail a photo of the rating plate to info@instalpunt.nl.
Frequently asked questions
What does Zehnder MVHR unit fault code ‘Fil’ ‘tEr’ (of ‘tEr’ ‘Fil’) mean?
Internal filter is dirty.
How do I fix fault code ‘Fil’ ‘tEr’ (of ‘tEr’ ‘Fil’) on an Zehnder MVHR unit?
Work through the step-by-step list above, then reset once. A code that returns after that is rarely solved by resetting again: either a part has failed or the appliance needs a proper diagnosis by a heating engineer.
Which parts do I need for Zehnder fault code ‘Fil’ ‘tEr’ (of ‘tEr’ ‘Fil’)?
Only the cause tells you. Open the Zehnder parts overview, pick your series from the rating plate and every part is listed with its manufacturer number, price and stock, ready to ship to any EU address.
Can I fix fault code ‘Fil’ ‘tEr’ (of ‘tEr’ ‘Fil’) myself?
The checks in the list above, yes: pressure, power, valves, condensate trap and a single reset. Anything inside the sealed combustion section or on the gas train is for a registered gas engineer, in every EU country.
All Zehnder MVHR unit faults and codes at a glance →