Wilo RS15/6-3 Ku P Circulator Pump 3 Speeds Ref. 4527335
Wilo RS15/6-3 Ku P circulating pump, with 3 speeds, manufactured by Wilo Intec. It circulates the water in the heating circuit; it should be checked if it doesn't circulate, makes noise, or doesn't start. Operates at 230V-50Hz, with power consumption of 0.20A/46W, 0.30A/67W, or 0.40A/93W depending on the speed. IP44 protection and nominal pressure PN6. Part number N 4527335. The material does not specify which boiler models it fits.
- Type of part
- Pumps
- Status
- Refurbished
- Catalogue reference
- 4527335
- Warranty
- 1 year
Wilo boilers compatible with reference 4527335
Circulating pump with reference 4527335. A verified compatibility: RS 15/6-3 Ku P 3 Speeds P/N 4527335.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Wilo RS 15/6-3 Ku P 3 Speeds P/N 4527335 | Wilo | 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. 4527335 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 4527335. 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 4527335
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 turns on, but the water in the radiators does not circulate.
Cause: If the impeller does not rotate, heat is not distributed even if the burner is functioning.
Change the pump to another one of the three speeds on the selector; sometimes the fault is just with that position.
- 02
The pump sounds louder than usual, almost like a squeak.
Cause: The noise may be due to air in the pump body or a worn bearing.
Bleed the air from the pump using the front screw at each speed before assuming it is a motor fault.
- 03
The circulator does not start at any of the three speeds.
Cause: If it doesn't start in the three positions, it could be a rotor lock or lack of voltage.
Measure with a multimeter that there is voltage at the pump connector before considering it faulty.
- 04
There is a water leak in the area of the motor shaft.
Cause: The internal mechanical seal is worn and allows water to leak out.
Dry the area and observe a complete boiler cycle to see if the drop reappears at the same point.
- 05
The pump is running but barely moves water, the heating takes a long time to heat up.
Cause: The impeller may be obstructed by scale or dirt, even if the motor is running.
Check the installation filter and bleed the air before considering that the pump is worn out.
Wilo fault codes that require diagnosis
| Code | Fault | Technical checks |
|---|---|---|
| F.75 | Pump fault/lack of water: when the pump starts, a sufficient pressure increase is not detected. | If the Wilo RS 15/6-3 Ku is blocked, seized, or not receiving power, the expected pressure increase at startup does not occur. Check by bleeding the circuit, verifying the shaft rotation through the front plug, and measuring the pump's consumption/flow rate while in operation. |
| F.23 | Safety shutdown: the temperature difference between flow and return is too large. | A blocked or underperforming Wilo RS 15/6-3 Ku pump reduces the flow rate and causes a significant temperature difference between the flow and return NTC sensors. Check by listening/observing the pump's rotation and measuring flow rate/ΔT in the pipes. |
| F.24 | Safety shutdown: temperature increase too rapid. | If the Wilo RS 15/6-3 Ku pump is blocked or delivering low flow, the water does not circulate and the boiler temperature rises quickly, triggering the protection. Check bleeding, pump rotation/consumption, and abnormal ΔT between supply and return. |
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 4527335 circulation pump.
- Catalogue reference
- 4527335
- Uniclima internal SKU
- MBWRSB15/63
- Brand
- Wilo
- Type of part
- Pumps
- Units in stock
- 3 units
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- Delivery time shown at checkout
- Return
- 14 days
Part data and available documentation
Contrast the label codes, PCB, and revision with the installed part; they are not necessarily equivalent references.
- Type
- RS15/6-3 Ku P
- Wilo Reference (N)
- 4527335
- Voltage
- 230V 50Hz
- Condenser
- 2.6 uF
- Nominal Pressure (PN)
- PN6
- Degree of protection (IP)
- IP44
- Insulation class
- Class F (TF95)
- Current / Power by speed
- I 0.20A/46W - II 0.30A/67W - III 0.40A/93W
- Printed code (week/lot)
- 16W34
- Manufacturing plant
- Wilo Intec, 50 av E. Casella, F-18700 Aubigny/Nere (Made in EU)
Frequently asked questions about the circulator pump 4527335
Who manufactures the Wilo RS15/6-3 Ku P Ref. 4527335 pump?
What voltage and consumption does the Wilo RS15/6-3 Ku P pump have according to the speed?
What nominal pressure does this Wilo RS15/6-3 Ku P pump support?
When should this 3-speed Wilo pump be replaced?
