Filling Key for Saunier Duval Isofast F24 Boiler Ref. 013005952
If you cannot refill water to the heating circuit or notice that it is continuously losing water, you may need the filling key for the Saunier Duval Isofast F24 boiler. This part allows you to restore the pressure of the heating system by adding water. Its failure can cause issues in the operation of the boiler. It is compatible with models such as Thema NOX F24 and SuperMicra Ecoplus, among others. It should be replaced when it shows leaks or does not allow the circuit to be filled.
VAT included
Consult via WhatsAppSaunier Duval boilers compatible with reference 013005952
Filling key with reference 013005952. Three confirmed compatibilities: Thema NOX F24 and SuperMicra Ecoplus.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Saunier Duval Thema NOx F24 | Saunier Duval | Contrasted |
| Saunier Duval SuperMicra Ecoplus | Saunier Duval | Contrasted |
| Saunier Duval Thema NOx F25 | Saunier Duval | Contrasted |
Can't see your model or have questions? The printed reference takes precedence. How to check it · Send us a photo via WhatsApp.
How to check if ref. 013005952 is the part for your boiler
What determines it is not the boiler model, but the reference printed on the part you already have installed.
- Find the reference printed on the installed part and check whether it matches the catalogue reference 013005952. If it is not visible, do not identify the part from its shape alone.
- Check the full boiler model on its data plate and look for it in the model associations on this page.
- Compare the connections and physical body with the original part before installation.
- If anything is unclear, send us a photo of the marking via WhatsApp before placing your order.
Symptoms and faults that the filling valve 013005952 resolves.
The filling valve allows water to refill the heating circuit. These are the typical symptoms and what to do:
Common symptoms and faults
- 01
You have to be constantly replenishing the pressure.
Cause: The valve does not close properly and allows water to flow all the time.
Close it tightly and note the pressure; if it rises on its own with the boiler off for several hours, the valve is not sealing.
- 02
There is dripping or moisture in the stem area with the valve closed.
Cause: The internal sealing of the stem has lost its tightness.
Dry the area and check if the humidity reappears without touching anything else.
- 03
It's hard to turn or it stops halfway through.
Cause: Limescale blocks the internal mechanism over time.
Try to move it carefully in both directions; if it doesn't give, don't force it with a tool.
- 04
The black ribbed cap is cracked or missing
Cause: It is the part most exposed to wear and tends to fail before the others.
Check that the stem turns well under the cap before replacing the entire valve.
These symptoms can have more than one cause. If your boiler displays a fault code, send it to us via WhatsApp along with a photo of the labeling, and we'll tell you if this is the part.
Fiche of the filling key Saunier Duval 013005952
- Catalogue reference
- 013005952
- Brand
- Saunier Duval
- Type of part
- Filling valves
- Units in stock
- 1 unit
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- 1-2 business days
- Return
- 14 days
Manuals and technical documentation
Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.
- Saunier Duval Thema Nox F25 Manual (PDF)Document © Saunier Duval, provided as a technical reference.
Frequently asked questions about the filling key 013005952
Is this filling valve with a black ribbed cap suitable for the Saunier Duval Isofast F24 boiler?
Which boiler models are compatible with the filling key LLTNOXF24?
What is the purpose of the filling key on the Saunier Duval boiler?
Are there fault codes associated with the filling valve LLTNOXF24?
How is the filling key used on the boiler?
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