Saunier Duval Isotwin F 24 E1 DHW Circulating Pump Ref. 05738300
When you open the hot water tap, the ACS Circulating Pump Saunier Duval Isotwin F 24 E1 Ref. 05738300 activates to move the water through the heating circuit. This pump is essential to ensure an adequate flow of hot water. If it fails, you will notice cold radiators, strange noises, or even overheating due to lack of circulation. It is compatible with models such as Isotwin C 24 E, Isotwin F 24 E, among others from the Isotwin and Isomax range. A technician must confirm through diagnosis whether it needs to be replaced when fault code 11: Pump blocked occurs.
Saunier Duval boilers compatible with reference 05738300
Circulating pump with reference 05738300. Six confirmed compatibilities: Isomax C 28 E and Isomax F 28 E.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Saunier Duval Isomax C 28 E | Isomax | Contrasted |
| Saunier Duval Isomax F 28 E | Isomax | Contrasted |
| Saunier Duval Isomax C 28 E2 | Isomax | Contrasted |
| Saunier Duval Isotwin C 24 E | Isotwin | Contrasted |
| Saunier Duval Isotwin F 24 E | Isotwin | Contrasted |
| Saunier Duval Isotwin F 28 E2 | 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. 05738300 is the part for your boiler
The part reference, model, and equipment revision must be verified against the manufacturer's documentation.
- Find the reference printed on the installed part and check whether it matches the catalogue reference 05738300. 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 that require diagnosis in the circulator pump 05738300
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 take a long time to heat up or remain cold even though the boiler is working.
Cause: If the impeller of the pump does not rotate or rotates at half speed, the hot water does not circulate properly through the heating circuit.
Check if the pump is buzzing without moving: it may just be stuck, not completely faulty.
- 02
The boiler beeps or shows a pressure or circulation fault shortly after turning on the heating.
Cause: The control unit detects that there is not enough flow and shuts down the equipment to protect the heat exchanger from overheating.
Bleed the air from the circuit and check the pressure of the expansion vessel before declaring the pump faulty.
- 03
A loud noise, like a buzzing or rattling, is heard in the area where the pump is located.
Cause: A worn shaft or trapped air in the pump body generates vibration and cavitation when rotating.
With the boiler off, try to manually turn the impeller shaft; many models have a slot for a screwdriver on the back of the motor.
- 04
After the summer without using the heating, the pump beeps but does not move water.
Cause: The impeller gets stuck due to limescale deposits when the water has been stagnant inside the body for months.
Before replacing it, manually force the rotation of the shaft with a flat screwdriver in the front slot of the motor.
Fault codes Saunier Duval that require diagnosis
| Code | Fault | Technical checks |
|---|---|---|
| 11 | Pump blocked. | If the sanitary pump 05738300 seizes or fails electrically during the DHW recharge, the electronics detect circulator blockage and trigger "11". Verification: force DHW demand, check 230 V and current in the pump, and release/inspect the shaft from the front cap. |
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 05738300 circulation pump.
- Catalogue reference
- 05738300
- Uniclima internal SKU
- BCIF24E1
- 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
Frequently asked questions about the circulator pump 05738300
Does this pump from the Isotwin F24E also fit the Isomax F28E2?
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