Saunier Duval Isofast F 28 E Circulating Pump - Ref. 05720700
When the heating system starts, the Saunier Duval Isofast F 28 E circulation pump is responsible for moving water through the heating circuit. If this part fails, you will notice cold radiators, strange noises, and possible overheating, which may trigger fault codes 11: Circulation pump blocked or 05: Overheating of the heating circuit. It is compatible with models from the Isofast, Isomax, and Isotwin ranges, among others. It is recommended to replace it when these symptoms occur to ensure proper water flow in the system.
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Consult via WhatsAppSaunier Duval boilers compatible with reference 05720700
Circulating pump with reference 05720700. 11 verified compatibilities: Isofast C 28 E and Isofast C 28 E1.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Saunier Duval Isofast C 28 E | Isofast | Contrasted |
| Saunier Duval Isofast C 28 E1 | Isofast | Contrasted |
| Saunier Duval Isofast F 28 E | Isofast | Contrasted |
| Saunier Duval Isofast F 28 E1 | Isofast | Contrasted |
| Saunier Duval Isomax C 28 E | Isomax | Contrasted |
| Saunier Duval Isomax C 28 E2 | Isomax | Contrasted |
| Saunier Duval Isomax F 28 E | Isomax | Contrasted |
| Saunier Duval Isomax F 28 E2 | Isomax | Contrasted |
| Saunier Duval Isotwin C 24 EA | Isotwin | Contrasted |
| Saunier Duval Isotwin F 24 E | Isotwin | Contrasted |
| Saunier Duval Isotwin F 24 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. 05720700 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 05720700. 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 05720700 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 radiators are not heating or are only partially heating, even though the boiler ignites without showing any fault.
Cause: The pump is not circulating water through the heating circuit, so the heat is not reaching the radiators.
Check if the outlet pipe of the pump is hot and the return pipe is cold; if you don't notice a difference, bleed the radiators in case there is air in the circuit.
- 02
A buzzing or vibrating noise is heard in the area of the pump.
Cause: The rotor spins with friction, trapped air, or scale buildup in the body.
With the boiler off, try turning the shaft by hand using the front screw; if it is difficult to turn, that is the source of the noise.
- 03
Water or moisture appears at the base of the pump, near the shaft.
Cause: The seal that seals the shaft has worn out and is allowing water to pass through slowly.
Dry the area well and check after a few hours of operation to confirm that the leak is coming from the shaft and not from a nearby joint.
- 04
The boiler has been off since spring, and now, when starting the heating, it doesn't heat anything.
Cause: The rotor has become stuck due to inactivity, which is common after months of not operating.
Try to manually unlock the shaft with a flat screwdriver on the front screw before declaring the pump faulty.
Fault codes from Saunier Duval that this spare part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| 11 | Circulation pump blocked. | The pump (circulator) is seized or not turning; the control detects a pump blockage. Verify by applying voltage to the pump and checking consumption/rotation (unblocking via front screw) and ensure it receives 230 V when there is demand. |
| 05 | Overheating of the heating circuit. | If the pump does not move the water (blocked/faulty or with air), the flow temperature rises very quickly and the limiter activates, causing 05. Check the pump's start-up and flow (noise/vibration, ΔT flow/return) and bleed the circuit; measure voltage at the pump during demand. |
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 05720700 circulation pump.
- Catalogue reference
- 05720700
- Brand
- Saunier Duval
- Type of part
- Pumps
- Units in stock
- 7 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.
- Voltage
- 230V~
- Frequency
- 50Hz
- Condenser
- 2 µF
- Nominal current
- 0.41 A (Im)
- Absorbed power
- 95 W (P1)
- Degree of protection
- IP 42
- Insulation class
- Class H
- Maximum pressure
- 6 bar
Frequently asked questions about the circulator pump 05720700
Which Saunier Duval boilers use this pump from the Isofast F 28 E?
What voltage and power does the pump of the Isofast F 28 E have?
What is the maximum pressure that the pump of the Isomax C 28 E can withstand?
Spare parts related to Saunier Duval Isofast
