Circulating Pump Ref. 4511423 - Baxi Gavina GTI / Buderus GB132T / Baxi Roca Laia / SD Twin
Baxi Gavina GTI, Buderus GB132T, and Baxi Roca Laia use the circulation pump, which is responsible for moving water through the heating circuit. When this part fails, you will notice cold radiators, unusual noises, overheating, or blockages due to lack of circulation. It is installed in several boilers, including models from Baxi, Buderus, and Baxi Roca, among others. It is advisable to replace it when these symptoms of malfunction occur.
VAT included
Consult via WhatsAppWilo boilers compatible with reference 4511423
Circulating pump with reference 4511423. Five confirmed compatibilities: Gavina GTI (NYL-43-15) and Logamax Plus GB132T.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Wilo Gavina GTI (NYL-43-15) | Baxi | Contrasted |
| Wilo Logamax Plus GB132T | Buderus | Contrasted |
| Wilo Laia NYL-43-15 | Baxi Roca | Contrasted |
| Wilo Duval Twin C 28 E | Saunier | Contrasted |
| Wilo Duval Twin F 28 E | Saunier | 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. 4511423 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 4511423. 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 4511423 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
There is no heating or domestic hot water because the water is not circulating through the system.
Cause: The pump is not moving the water, which prevents the heating and domestic hot water from functioning.
Listen for a typical humming sound from the pump trying to start; if there is no sound, check the fuse and the power supply to the pump.
- 02
The pump makes noise, vibrates, or takes a long time to start
Cause: The impeller may be rubbing, or the bearing may be worn out.
Bleed the air from the system before replacing it, as a circuit with air can show similar symptoms.
- 03
Water leak from the pump shaft or body
Cause: The mechanical seal has lost its tightness over time.
Tighten the screws on the body and check the gasket before considering that the leak is due to a fault in the closure.
- 04
The pump is blocked and does not rotate after the summer shutdown.
Cause: Limescale deposits may have seized the shaft after months of inactivity.
Remove the front cap and try to turn the shaft by hand with a screwdriver before deciding to replace the pump.
Fault codes Wilo that this part solves
| Code | Fault | Diagnosis and solution |
|---|---|---|
| E125 | Baxi: lack of circulation in the primary circuit/air in the system. | If the Wilo RS15/5-3C pump is blocked or not rotating, there is no flow and the equipment detects a lack of circulation. Verify by forcing the pump to run (test mode), checking voltage at terminals and shaft rotation through the bleed screw. |
| F.75 | Vaillant: when the pump starts, sufficient pressure increase is not detected. | A seized or unpowered Wilo RS15/5-3C pump does not generate the expected pressure increase at the start. Check the pump (blockage/noise/consumption), voltage, and run program P.0 to see if there is a pressure jump. |
| F.75 | Saunier Duval: insufficient pressure/pressure increase not detected when the pump starts. | If the Wilo RS15/5-3C pump fails, the equipment does not detect the pressure increase generated by the circulator's start-up. Check system pressure, bleed, and test the pump (voltage/rotation). |
| A1 281 | Junkers/Bosch: the heating pump does not generate pressure (blocked or with air). | A Wilo RS15/5-3C blocked or with a seized rotor prevents generating pressure/flow. Check circuit pressure, bleed and test the pump (voltage at terminals, continuous service operation); replace if it does not rotate. |
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 4511423 circulation pump.
- Catalogue reference
- 4511423
- Brand
- Wilo
- Type of part
- Pumps
- Units in stock
- 1 unit
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- 1-2 business days
- Return
- 14 days
Frequently asked questions about the circulator pump 4511423
Is this pump Ref. 4511423 suitable for a Baxi Roca Laia NYL-43-15?
When should the circulating pump of the Buderus Logamax Plus GB132T be checked?
Does this pump have any code that I can check on my Baxi Gavina GTI?
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