Grundfos Pump Head/Motor - Junkers Cerapur Comfort ZWBC - Ref. 8716106850
Grundfos UPS 15-60 CHG pump head/motor used in the Junkers Cerapur Comfort ZWBC boiler, also compatible with equivalent Worcester Greenstar models. The PCB is dual-marked Bosch/Grundfos. It circulates the heating circuit water at three speeds. It is replaced when the motor stops turning, makes noise, or the boiler loses heating circulation.
VAT included
Consult via WhatsAppJunkers boilers compatible with reference 8716106850
Circulating pump with reference 8716106850. Nine confirmed compatibilities: ZWBC24-2C23 and ZWBC24-2C31.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Junkers ZWBC24-2C23 | Junkers/Bosch Cerapur Comfort (ZWBC series 2) | Contrasted |
| Junkers ZWBC24-2C31 | Junkers/Bosch Cerapur Comfort (ZWBC series 2) | Contrasted |
| Junkers ZWBC25-2C23 | Junkers/Bosch Cerapur Comfort (ZWBC series 2) | Contrasted |
| Junkers ZWBC25-2C31 | Junkers/Bosch Cerapur Comfort (ZWBC series 2) | Contrasted |
| Junkers ZWBC28-2C23 | Junkers/Bosch Cerapur Comfort (ZWBC series 2) | Contrasted |
| Junkers ZWBC28-2C31 | Junkers/Bosch Cerapur Comfort (ZWBC series 2) | Contrasted |
| Junkers ZWBC30-2C23 | Junkers/Bosch Cerapur Comfort (ZWBC series 2) | Contrasted |
| Junkers ZWBC30-2C31 | Junkers/Bosch Cerapur Comfort (ZWBC series 2) | Contrasted |
| Junkers ZWN25-8MFA | Junkers ZWN | 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. 8716106850 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 8716106850. 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 8716106850 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 pump motor does not spin or has difficulty starting, although you can hear it trying.
Cause: The internal impeller may be seized due to limescale, which is common in this head after a period of inactivity.
Try to unlock the shaft with the central screw of the motor before replacing the entire head.
- 02
The pump makes noise or vibrates when operating.
Cause: The wear of the bearing or scale residues in the impeller generate that characteristic noise.
Compare the noise at different speeds; if it varies significantly from one to another, it may just be dirt in the impeller.
- 03
The radiators are not heating or are heating unevenly despite the boiler igniting.
Cause: There is a lack of water circulation in the heating circuit because the motor is not functioning properly.
Check that the motor is running at a high speed before replacing it, and that the circuit switches are open.
- 04
The boiler shows a pump or circulation fault on the display.
Cause: The electronics detect that there is not enough water flow in the circuit.
Note the exact fault code displayed by the boiler before requesting the head; some models share errors with pressure or air faults in the circuit.
Fault codes from Junkers that this part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| A1 | Pump blocked or running with air. | If the circulating pump (8716106850) is seized or cavitating, there is no flow and the Heatronic displays A1; check pressure 1–1.5 bar, bleed and activate pump test to confirm it rotates and consumes. |
| E9 | Overheating: temperature limiter activated (STB/safety). | A pump fault (blocked or not rotating) reduces the flow rate and the thermal block overheats; check pressure, bleed, and confirm pump start-up/vibration with a service test. |
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 Junkers 8716106850 circulation pump.
- Catalogue reference
- 8716106850
- Brand
- Junkers
- 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.
- Nominal voltage
- 230V ~ 50Hz
- Condenser
- 2.5 µF
- Current and power by speed
- 0.21A/45W - 0.32A/70W - 0.40A/90W
- Protection
- IP44
- Insulation class
- Class H (TF 95)
- Maximum pressure
- 0.3 MPa
- The plate has dual marking: 'BOSCH' on the casing and 'GRUNDFOS' next to 'UPS XX-60 J2' on the plate foot; the actual manufacturer of this pump is Grundfos.
Frequently asked questions about the circulator pump 8716106850
Is the head of this pump from Bosch or Grundfos in the Junkers Cerapur Comfort ZWBC?
Is this head compatible with a Worcester Greenstar 24i Junior?
Is reference 8716106850 the same spare part as 8716106355?
What capacitor does the motor of this pump use in a ZWBC 30-2C?
When should this head be replaced in a Junkers ZWN25-8MFA?
Spare parts related to Junkers Junkers/Bosch Cerapur Comfort (ZWBC series 2)
