How do I know if this circulating pump is the one for my boiler?

Verify the reference 8717204264 printed and ensure your model is on the list of compatible ones; also compare the connections with the original part. It is a Grundfos piece.

The circulating pump circulates the water through the heating circuit.

Noise, water not circulating, or cold radiators?

Typical symptoms: humming, seized rotor after a long stop, or radiators that do not heat evenly.

Which models is it suitable for?

Part shared by various models (see Compatibility). If your model does not appear, send us a photo of the marking and we will confirm it.

Installation and recommendations

Bleed the air from the circuit and the pump; check the pressure at 1–1.5 bar with the boiler cold.

What does refurbished mean and what coverage does it have?

Part removed from a boiler out of service, inspected and tested. Includes 1-year warranty and 14-day return policy. Delivery within 2–4 working days in the EU.

What does fault code E9 mean on Junkers?

Temperature limiter (STB) activated due to overheating. If the circulating pump is blocked, faulty, or has air, there is no circulation in the primary; the heat exchanger overheats and triggers the STB. Check that the pump is rotating and receiving voltage, and bleed the circuit to remove air pockets.

RefurbishedJunkers Pumps

Junkers Eurostar Circulating Pump ZWE24 3MFAD23 Grundfos Ref. 8717204264

50 €VAT includedIn stock · 7 units

Circulating pump: refurbished spare part that circulates water in the heating circuit. Useful if there is noise, water is not circulating, or radiators do not heat evenly. Compatible with ZWE 24, ZWE 24-1 ADE, ZWE 24-2 ADE (ref. 8717204264). Includes a one-year warranty and delivery within 2–4 working days in the EU.

Consult via WhatsApp

Not sure if it's your part? Send us a photo of the screen printing via WhatsApp and we'll confirm compatibility before you purchase.

Delivery in 2–4 working days

1-year warranty

14-day return

Technical support

Key Data

Reference: 8717204264
Brand: Junkers
Type of part: Pumps
Available units: 7 units in stock
Status: Refurbished
Warranty: 1 year
Shipping: 2–4 working days (EU)
Return: 14 days

The same part (ref. 8717204264) equips these models. Verified compatibility; check the reference before purchasing.

Eurostar (ZWE 24)

ZWE 24
ZWE 24-1 ADE
ZWE 24-2 ADE
ZWE 24-2 KDP
ZWE 24-3 MFAD
ZWE 24-3 HKD

ZWR (atmospheric mixed)

ZWR 18-2 KDE
ZWR 24-2 ADE

ZR (atmospheric heating only)

ZR 18-2 KDE

ZE / Cerastar (ZE 24)

ZE 24-2 KDP
ZE 24-3 MFKD

Mini / compact

MINI 11 KE

ZBR (low condensation)

ZBR 12
ZBR 25 A

Fault codes related to this part (not the entire boiler). They usually have more possible causes: first rule out electrodes, wiring/connections, and gas supply. Verified with ≥3 sources.

Code	What does it mean?	Cause and diagnosis (this part)
E9	Temperature limiter (STB) activated due to overheating.	If the circulating pump is blocked, faulty, or has air, there is no circulation in the primary; the heat exchanger overheats and triggers the STB. Check that the pump is rotating and receiving voltage, and bleed the circuit to remove air pockets.

How do I know if this circulating pump is the one for my boiler?: Verify the reference 8717204264 printed and ensure your model is on the list of compatible ones; also compare the connections with the original part. It is a Grundfos piece.
What is it used for?: The circulating pump circulates the water through the heating circuit.
Noise, water not circulating, or cold radiators?: Typical symptoms: humming, seized rotor after a long stop, or radiators that do not heat evenly.
Which models is it suitable for?: Part shared by various models (see Compatibility). If your model does not appear, send us a photo of the marking and we will confirm it.
Installation and recommendations: Bleed the air from the circuit and the pump; check the pressure at 1–1.5 bar with the boiler cold.
What does refurbished mean and what coverage does it have?: Part removed from a boiler out of service, inspected and tested. Includes 1-year warranty and 14-day return policy. Delivery within 2–4 working days in the EU.