Grundfos Circulating Pump Saunier Duval Isofast C 35 E Ref. 05732500
Grundfos circulator pump Saunier Duval Isofast C 35 E Ref. 05732500, designed to move water through the heating circuit. When this pump fails, users may notice cold radiators, strange noises, overheating, and blockages due to lack of circulation, with fault code 11: Pump blocked possibly appearing. It is compatible with boilers from the Isofast range, such as the C 35 E, C 35 E1, and other models, as well as with the Isomax and Isotwin ranges. It is recommended to replace it when the mentioned symptoms are detected to avoid larger issues.
VAT included
Consult via WhatsAppSaunier Duval boilers compatible with reference 05732500
Circulating pump with reference 05732500. Eight confirmed compatibilities: C 35 E and C 35 E1.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Saunier Duval C 35 E | Isofast | Contrasted |
| Saunier Duval C 35 E1 | Isofast | Contrasted |
| Saunier Duval F 35 E | Isofast | Contrasted |
| Saunier Duval F 35 E1 | Isofast | Contrasted |
| Saunier Duval C28 E205 | Isomax | Contrasted |
| Saunier Duval F28 E205 | Isomax | Contrasted |
| Saunier Duval C 28 EA | Isotwin | Contrasted |
| Saunier Duval F 28 EA | 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. 05732500 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 05732500. 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 05732500 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 the water for heating even though the burner seems to ignite.
Cause: The circulator does not start, so the hot water does not circulate to the radiators.
Check if you hear or feel any vibration in the body of the pump when turning on the heating; if it is completely silent and cold, the motor is not starting.
- 02
A vibration or rattling noise appears in the pump area.
Cause: It usually comes from trapped air in the circuit or a bearing worn out from use.
Bleed the heating circuit before replacing the pump; if the noise doesn't change after bleeding, internal wear is more likely.
- 03
The heating works but it takes longer to warm up the house than before, as if it's lacking power.
Cause: When the impeller loses efficiency, the circulator continues to spin but does not reach the necessary flow for the entire circuit.
Compare if the problem is general throughout the entire installation or only in the areas farthest from the boiler; if it is general, it points more towards the pump.
- 04
There is moisture or dripping on the pump body.
Cause: The shaft seal wears out over the years and gradually allows water to leak to the outside.
Dry the area and check again after a while of operation; if the moisture reappears right at the shaft, it confirms the wear of the seal.
- 05
The boiler operates for a few minutes and then goes into a lockout related to the heating.
Cause: Without sufficient flow, the control unit interprets that there is a circulation fault and shuts off the service for safety.
Check that the circuit's stop valves are open and that there is no lack of water pressure in the circuit before replacing the circulator.
Fault codes from Saunier Duval that this spare part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| 11 | Pump blocked | The circulating pump with bleeder (Ref. 05732500) is seized/stuck or filled with air, preventing circulation; the electronics detect the pump blockage and display 11. Check for the presence of 230 V in the pump and that the rotor spins/consumes; attempt to unblock using the front screw and bleed through the automatic bleeder. |
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 05732500 circulation pump.
- Catalogue reference
- 05732500
- Brand
- Saunier Duval
- Type of part
- Pumps
- Units in stock
- 5 units
- 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
- Grundfos
- Code (P/N)
- 59716503
- Production code (PC)
- 9942
- Voltage
- 230 V ~ 50 Hz
- Condenser
- 2.5 µF
- Protection
- IP 44
- Thermal class
- TF 95 / Class H
- Maximum pressure
- 6 bar
- Current
- 0.45 A
- Absorbed power (P1)
- 110 W
Frequently asked questions about the circulator pump 05732500
Who manufactures the pump for the Saunier Duval Isofast C 35 E?
What is the maximum pressure the pump of the Isofast C 35 E can handle?
What is the manufacturer code engraved on the pump of the Isofast C 35 E?
Does the Saunier Duval Isotwin F 28 EA have this same pump?
Spare parts related to Saunier Duval Isofast
