Wilo Circulating Pump Motor NFHUL15/4.3-3 C Ref. 4507866
Wilo NFHUL15/4.3-3 C circulator pump motor, three speeds, for Ariston Microtec 23 MFFI, T2/23 MI, and Uno 24 MFFI boilers. Power supply 230V~50Hz, 2 µF capacitor, protection class IP42, nominal pressure PN6, thermal class F. It is replaced when the motor does not start, makes noise, or stops circulating water.
VAT included
Consult via WhatsAppWilo boilers compatible with reference 4507866
Circulating pump with reference 4507866. 12 verified compatibilities: C24 and F24.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Wilo C24 | Ferroli Domiproject | Contrasted |
| Wilo F24 | Ferroli Domiproject | Contrasted |
| Wilo F32 | Ferroli Domiproject | Contrasted |
| Wilo C24 D | Ferroli Divatech | Contrasted |
| Wilo F24 D | Ferroli Divatech | Contrasted |
| Wilo F32 D | Ferroli Divatech | Contrasted |
| Wilo C24 | Ferroli Domicompact | Contrasted |
| Wilo F24 | Ferroli Domicompact | Contrasted |
| Wilo C30 | Ferroli Domicompact | Contrasted |
| Wilo F30 | Ferroli Domicompact | Contrasted |
| Wilo C24 | Ferroli FerEasy | Contrasted |
| Wilo F24 | Ferroli FerEasy | 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 part number 4507866 is the one 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 4507866. 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 circulation pump 4507866 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 do not heat up even though the boiler ignites and modulates normally.
Cause: If the pump motor does not move the water, the heat will not circulate through the system.
Make sure the shaft rotates freely with a screwdriver in the front slot of the motor before replacing the pump.
- 02
The pump makes noise, buzzes, or vibrates while running.
Cause: A worn bearing or trapped air in the pump body generates noise even though the motor continues to operate.
Bleed the air from the circuit and measure the pressure of the installation before attributing the noise to the motor.
- 03
The pump does not start after the summer or after being idle for a while.
Cause: The shaft can become stuck due to sediment or scale when it hasn't turned for months.
Try to manually unlock the shaft using the slot at the end of the motor before replacing it.
- 04
The boiler gives a warning or fault code related to the pump or the circulator.
Cause: The control unit detects that the motor does not respond to the rotation command and triggers a specific pump fault code.
Check that the pump receives 230V at its connector when there is a heating demand before declaring the motor faulty.
Fault codes Wilo that this part solves
| Code | Fault | Diagnosis and solution |
|---|---|---|
| A03 | Overtemperature protection activation. | A lack of circulation due to a fault/blockage in the Wilo NFHUL15-4 circulator pump (ref. 4507866) causes the flow sensor to trigger the protection; verify that the pump receives 230 V, rotates freely (shaft unlocking), bleed air, and confirm flow/ΔT. |
| F43 | Activation of the heat exchanger protection. | The heat exchanger reaches the temperature limit due to lack of circulation when the Wilo NFHUL15-4 pump is blocked/faulty; check that the pump is rotating (consumption/noise/hot return), has power supply, and that the circuit is bled. |
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 Wilo circulator pump 4507866
- Catalogue reference
- 4507866
- Brand
- Wilo
- 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
- Code
- NFHUL15/4.3-3 C | 4507866 /04
- Voltage/frequency
- 230V~ 50Hz (400VDC)
- Condenser
- 2 µF
- Degree of protection
- IP42
- Nominal pressure
- PN6
- Thermal class
- Class F / TF95
- Speed/current/power
- III: 2350 rpm, 0.30A, 70W | II: 2150 rpm, 0.24A, 52W | I: 1750 rpm, 0.18A, 38W
Frequently asked questions about the circulator pump 4507866
Is this Wilo NFHUL15/4.3-3 C motor (ref. 4507866) compatible with my Ferroli Domiproject C24 boiler?
Which Ferroli boilers are compatible with the Wilo NFHUL15/4.3-3 C motor?
What faults indicate that I need to replace the Wilo NFHUL15/4.3-3 C motor in my boiler?
What type of capacitor does the Wilo motor of Ferroli boilers need?
How many boiler models are compatible with the Wilo NFHUL15/4.3-3 C motor?
What fault codes are documented for the Wilo NFHUL15/4.3-3 C motor?
