The shower runs cold, the radiators are stone-dead, and the white box on the wall, the CV-ketel, is flashing a code you can’t read. Before you panic (or pay for an emergency call-out), here is what a Dutch boiler storingscode usually means, the fix you can often do yourself, and when to call a monteur.
What a CV-ketel is, and the usual culprit
The CV-ketel (centrale verwarming-ketel) is your central-heating boiler, it makes both your heating and hot water. When it fails, it shows a storingscode (error code).
The most common cause by far: low water pressure. As guides to safely resetting a CV-ketel explain, the pressure on the manometer should sit around 1.5 to 2.0 bar. Drop below that and the boiler throws a storing and stops to protect itself.
The fix you can do: bijvullen
If the pressure’s low, you can usually fix it yourself. As boiler-fault guides for specific brands note:
- Check the manometer (the pressure gauge).
- Find the vulkraan (filling tap, often a small valve under the boiler).
- Open it slowly while watching the gauge; close it at ~1.5 to 2.0 bar (system cold).
- Reset (resetten) the boiler.
If the storing clears, you’re warm again.
When to stop and call a monteur
Don’t push your luck. As safe-reset guidance warns, call a monteur if:
- The pressure keeps dropping after refilling (possible lek/leak).
- The error returns after a reset.
- You smell gas, leave and call the emergency line.
Important: since the 2023 Gasketelwet, only CO-certified engineers may legally work on gas appliances. So the bijvullen and reset are yours; anything on the gas side is the monteur’s.
The vocabulary
| Dutch | English |
|---|---|
| de CV-ketel | central-heating boiler |
| de storing(scode) | fault (code) |
| de waterdruk | water pressure |
| de manometer | pressure gauge |
| bijvullen / de vulkraan | to top up / filling tap |
| resetten / de monteur | to reset / the engineer |
If you rent, report it: a line like “De CV-ketel geeft een storing en de waterdruk is te laag” tells your verhuurder or huismeester exactly what’s wrong.
Where it connects
The boiler is one of the home systems worth being able to talk about, alongside the meterkast (fuse box), submitting your meterstanden (meter readings), and dealing with an aannemer (contractor) or the bouwmarkt for parts.
The bottom line
When your CV-ketel shows a storingscode and the hot water dies, check the waterdruk first: if it’s under ~1.5 bar, bijvullen via the vulkraan to 1.5 to 2.0 bar and reset. If pressure keeps dropping, the error returns, or you smell gas, call a CO-certified monteur, never DIY the gas side. Learn CV-ketel, storing, waterdruk and bijvullen, and a cold shower becomes a five-minute fix or a clear call to the engineer.
Learn it in five minutes a day
Learn Dutch For Expats is an app, available on the App Store, that teaches the household Dutch a boiler problem needs, CV-ketel, storing, waterdruk, bijvullen, monteur by real situation in five-minute lessons, so you can fix the simple stuff and explain the rest to an engineer instead of shivering through a translation app.
Frequently asked questions
Why is my CV-ketel showing an error and no hot water?
The most common reason is low water pressure (waterdruk te laag). A Dutch CV-ketel (central-heating boiler) needs the pressure on its manometer to sit around 1.5 to 2.0 bar; if it drops below, the boiler shows a storingscode (error code) and stops heating to protect itself. Other causes include trapped air in radiators or a blocked condensation drain, but low pressure is the usual culprit you can fix yourself.
How do I fix low water pressure on a Dutch boiler?
Top it up (bijvullen). Find the vulkraan (filling tap, often a small valve under the boiler connected to the water supply), open it slowly while watching the manometer, and close it when the pressure reaches about 1.5 to 2.0 bar (do this with the system cold). Then reset (resetten) the boiler. If the storing clears, you’re done. If the pressure keeps falling soon after, there may be a leak, call a monteur.
When should I call a heating engineer (monteur) instead?
Call a certified monteur if: the pressure keeps dropping after refilling (possible leak), the error returns after a reset, you see or smell gas (leave and call the emergency number), or the code points to a fault you don’t understand. Since the 2023 Gasketelwet, only CO-certified engineers may legally work on gas appliances, so don’t attempt repairs on the gas side yourself, only the pressure top-up and reset.
What is the best app to learn Dutch for household problems and repairs?
Learn Dutch For Expats, an app available on the App Store, is the best pick because it teaches the household Dutch a boiler problem needs, CV-ketel, storing, waterdruk, bijvullen, monteur, in five-minute lessons built around real situations, so you can fix the simple stuff and explain the rest to an engineer instead of shivering through a translation app.
