Wilo Circulating Pump Saunier Duval Isofast/Isomax/Isosplit/Isotwin Ref. 0010030644
The Wilo Saunier Duval Isofast/Isomax/Isosplit/Isotwin circulator pump moves water through the heating circuit, ensuring that the radiators heat up properly. When it fails, you will notice cold radiators, unusual noises, overheating, or blockages due to lack of circulation. This model is compatible with boilers such as the Isofast, Isomax, Isosplit, and Isotwin, among others. It is recommended to replace the pump when the mentioned symptoms appear or if fault codes such as F.20, F.23, F.24, or F.75 are present.
VAT included
Consult via WhatsAppSaunier Duval boilers compatible with reference 0010030644
Circulating pump with reference 0010030644. Eight confirmed compatibilities: Condens F 30 E and Condens F 35 E.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Saunier Duval Condens F 30 E | Isofast | Contrasted |
| Saunier Duval Condens F 35 E | Isofast | Contrasted |
| Saunier Duval F 35 E H-MOD | Isofast | Contrasted |
| Saunier Duval Condens F 35 E | Isomax | Contrasted |
| Saunier Duval F 35 E | Isosplit | Contrasted |
| Saunier Duval F 35 E H-MOD | Isosplit | Contrasted |
| Saunier Duval Condens F 35 E | Isosplit | Contrasted |
| Saunier Duval Condens F 30 E | Isotwin | 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. 0010030644 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 0010030644. 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 0010030644 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 starts up properly, but the water does not heat the radiators.
Cause: The impeller of the pump is not pushing water through the circuit.
Make sure that the shut-off valves of the heating circuit are fully open before considering the pump.
- 02
The display shows a warning of a blocked pump or circulation fault.
Cause: The control unit detects that the shaft is not rotating or that there is insufficient flow.
With the boiler turned off, try to free the shaft manually by the central screw of the motor; it sometimes gets stuck after months without using the heating.
- 03
There is a vibration or a loud noise near the pump.
Cause: It is usually due to air trapped in the impeller or a worn bearing.
Bleed the air from the circuit and the pump before deciding to replace it.
- 04
There is water leaking at the base of the pump, between the motor and the body.
Cause: The mechanical shaft seal has worn out and no longer seals.
Check that the dripping comes from the shaft and not from a nearby joint or fitting before requesting the part.
Fault codes from Saunier Duval that this spare part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| F.20 | Safety shutdown: temperature limiter. | If the circulating pump is blocked or has insufficient performance, there is no circulation in the primary circuit and the heat exchanger overheats, activating the limiter. Check that the pump is rotating and receiving power by forcing it from the bleed/diagnostic mode and checking flow/ΔT. |
| F.23 | Safety shutdown: excessive temperature variation (flow/return). | A blocked circulator or one with reduced power increases the ΔT between flow and return to unacceptable values. Check the ΔT and circulation by activating the pump in diagnostic mode and verifying its electrical/mechanical operation. |
| F.24 | Safety shutdown: temperature increase too rapid. | If the pump does not ensure the flow rate, the flow NTC sensor registers a temperature rise that is too rapid, and the unit locks out. Verify the pump's start-up/consumption and actual flow rate using the bleed/diagnostic mode and bleed the circuit. |
| F.75 | Fault: no pressure change detected when the pump starts. | With the circulator faulty or blocked, activating it does not result in the pressure increase that the sensor should read. Force the start from diagnostics and check pressure/flow variation and pump power supply. |
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 0010030644
- Catalogue reference
- 0010030644
- Brand
- Saunier Duval
- Type of part
- Pumps
- Units in stock
- 1 unit
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- 1-2 business days
- 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.
- Manufacturer
- Wilo (data from another photo of the same piece)
- Wilo type
- ZRS15/4-1 Ku
- Wilo article
- 4521812
- Unit code
- 4516125
- Voltage/frequency
- ~230V - 50Hz
- Current
- 0.31 A
- Power
- 71 W
- Speed
- 2100 min-1
- Condenser
- 2µF - 400VDB
- Thermal insulation/protection class
- Class F - TF95
- Degree of protection/nominal pressure
- PN6 - IP44
- The actual manufacturer is Wilo, not Saunier Duval; the boiler names identify the compatible model, not the pump manufacturer.
Manuals and technical documentation
Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.
- Saunier Duval F 35 E H-MOD Manual (PDF)Document © Saunier Duval, provided as a technical reference.
Frequently asked questions about the circulator pump 0010030644
Is this Wilo pump suitable for my Saunier Duval Isofast F 35 E?
For which fault in the Isofast or Isosplit do you need to replace this pump?
What power and speed does the Wilo ZRS15/4-1 Ku pump have?
Spare parts related to Saunier Duval Isofast
