Saunier Duval Isomax F 35 H-MOD Sanitary Circulating Pump Xylem SDZ-2/DC Ref. 0020111412
If you notice that your radiators are cold or hear strange noises, you may need the Saunier Duval Isomax F 35 H-MOD Xylem Domestic Circulating Pump. This pump is responsible for moving water through the heating circuit, ensuring proper circulation. When it fails, it can cause overheating and blockages. It is compatible with models such as the Duval Isofast 21 Condens F 25, Duval Isomax C 30, and Duval Isotwin F 30 E H-MOD, among others. It should be replaced when you experience these symptoms or if the fault code F.081 appears, indicating that the overfeeding has failed.
VAT included
Consult via WhatsAppSaunier Duval boilers compatible with reference 0020111412
Circulating pump with reference 0020111412. Eight confirmed compatibilities: Duval Isofast 21 Condens F 25 and Duval Isomax C 30.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Saunier Duval Duval Isofast 21 Condens F 25 | Saunier | Contrasted |
| Saunier Duval Duval Isomax C 30 | Saunier | Contrasted |
| Saunier Duval Duval Isomax Condens F 30-B | Saunier | Contrasted |
| Saunier Duval Duval Isomax Condens F 35 | Saunier | Contrasted |
| Saunier Duval Duval Isomax Condens F 35-B | Saunier | Contrasted |
| Saunier Duval Duval Isotwin C 30 E | Saunier | Contrasted |
| Saunier Duval Duval Isotwin Condens F 25-A | Saunier | Contrasted |
| Saunier Duval Duval Isotwin F 30 E H-MOD | Saunier | 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 the reference 0020111412 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 0020111412. 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 circulator pump 0020111412 resolves.
The circulation pump circulates the water in the heating circuit. These are the typical symptoms and what to do:
Common symptoms and faults
- 01
The boiler is not heating or is heating less than normal.
Cause: If the pump does not move the water, the heating circuit does not circulate and the radiators do not receive heat.
Touch the supply and return pipes of the pump: if you don't notice a temperature difference between them, it is a sign that there is no circulation.
- 02
Noise or vibration in the pump area
Cause: The bearing or the impeller is worn and generates friction when rotating.
Bleed the circuit and check that there is no air in the system before changing the pump: air also makes a bubbling noise.
- 03
Water leak around the pump body
Cause: The mechanical seal of the shaft is worn and allows water to pass through.
Dry the area well and check again after a while of operation to confirm that the leak is coming from the body of the pump and not from a nearby joint or fitting.
- 04
The pump does not start or remains stopped.
Cause: The shaft has seized, which is common after months of inactivity during the summer.
With the boiler turned off, try to turn the motor shaft with a flat screwdriver through the front slot before replacing the pump.
Fault codes from Saunier Duval that this spare part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| F.081 | The boost has failed. | Sanitary circulating pump (DHW loading/recirculation pump) blocked or faulty prevents flow in the micro-accumulator loading, causing overheating; verify by activating the loading pump actuator test (e.g., T.004) and checking rotation/consumption and DHW return. |
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.
Data sheet for the Saunier Duval circulator pump 0020111412
- Catalogue reference
- 0020111412
- Brand
- Saunier Duval
- Type of part
- Pumps
- Units in stock
- 5 units
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- Delivery time shown at checkout
- Return
- 14 days
Data read on the part and in the manufacturer's documentation
What we have not been able to verify does not appear here.
- Code on additional label (motor casing)
- C09
- Molded marking on casing
- A-98 293 001 · 1080 · PA GF40
- The molded marking on the casing (A-98 293 001, 1080, PA GF40) are mold and plastic material marks; it is not a manufacturer reference or a product code.
Manuals and technical documentation
Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.
- Saunier Duval Duval Isomax C 30 Manual (PDF)Document © Saunier Duval, provided as a technical reference.
Frequently asked questions about the circulator pump 0020111412
What does the marking 'A-98 293 001' on the casing of this pump mean?
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