Junkers Cerastar ZWE 24-3 PCB Ref. 8748300267
If your boiler does not start, locks out, or exhibits erratic behavior, you may need the Junkers Cerastar ZWE 24-3 PCB, reference 8748300267. This control board manages the ignition, burner modulation, pump, and safety features of the boiler. When it fails, you may notice that the boiler does not operate as it should. It is compatible with several models from the Junkers Eurostar and Cerastar ranges, such as the ZWE 24-3 MFK and the ZE 24-3 MFA, among others. It is recommended to replace it upon detecting these symptoms of malfunction.
VAT included
Consult via WhatsAppBosch Junkers boilers compatible with reference 87483002670
PCB with reference 87483002670. Ten verified compatibilities: ZWE 24-3 MFK and ZWE 24-3 MFKD.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Bosch Junkers ZWE 24-3 MFK | Junkers Eurostar / Cerastar ZWE 24-3 | Contrasted |
| Bosch Junkers ZWE 24-3 MFKD | Junkers Eurostar / Cerastar ZWE 24-3 | Contrasted |
| Bosch Junkers ZWE 24-3 MFAD | Junkers Eurostar / Cerastar ZWE 24-3 | Contrasted |
| Bosch Junkers ZWE 24-3 MFA | Junkers Eurostar / Cerastar ZWE 24-3 | Contrasted |
| Bosch Junkers ZWE 24-3 HAD | Junkers Eurostar / Cerastar ZWE 24-3 | Contrasted |
| Bosch Junkers ZWE 24-3 HKD | Junkers Eurostar / Cerastar ZWE 24-3 | Contrasted |
| Bosch Junkers ZE 24-3 MFK | Junkers Eurostar / Cerastar ZE 24-3 | Contrasted |
| Bosch Junkers ZE 24-3 MFA | Junkers Eurostar / Cerastar ZE 24-3 | Contrasted |
| Bosch Junkers ZWE 28-3 MFAD | Junkers Eurostar / Cerastar ZWE 28-3 | Contrasted |
| Bosch Junkers ZWE 28-3 HAD | Junkers Eurostar / Cerastar ZWE 28-3 | 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. 87483002670 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 87483002670. If it is not visible, do not identify the part by 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 PCB 87483002670 resolves.
The PCB controls the ignition, modulation, and safety features of the boiler. These are the typical symptoms and what to do:
Common symptoms and faults
- 01
The boiler does not start at all: no display, no fan, and no noise when powered on.
Cause: If the power supply stage of the PCB fails, the entire boiler remains uncontrolled even if it receives mains power.
Check the fuse on the PCB and make sure that the main switch and the differential switch in the house have not tripped.
- 02
The same fault code keeps appearing even though the component it indicates seems to be in good condition.
Cause: The PCB interprets that signal, and if the fault is in its reading circuit, the fault code appears even if the sensor is in good condition.
Measure the component indicated by the code with a multimeter before declaring the PCB responsible.
- 03
The three-way valve gets stuck prioritizing domestic hot water or heating, unable to alternate.
Cause: The PCB controls the motor of the three-way valve, and a fault in that output leaves it stuck in a single position.
Check that the valve turns freely by hand before assuming that the fault is with the PCB that controls it.
- 04
The remote control loses connection: it does not display the temperature or allow any adjustments.
Cause: Communication with the control is managed from the PCB, and a fault at that stage cuts off the signal even if the control is in good condition.
Check the communication bus wiring on the terminal block of the PCB before replacing it.
Fault codes for Bosch Junkers that this part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| E0 | Internal fault in the PCB. | The self-diagnosis detects an internal fault in the main board; the manufacturer prescribes replacing the printed circuit board. Beforehand, check power supplies/connections and fuses and reset: if the E0 reappears, the PCB is defective. |
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 Bosch Junkers PCB 87483002670
- Catalogue reference
- 87483002670
- Brand
- Bosch Junkers
- Type of part
- PCBs (control boards)
- 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.
- Silkscreened code on the PCB
- 8 748 300 267
- Relay marking
- GZT 3 / AB AA AA
Frequently asked questions about the PCB 87483002670
Does this PCB work for my Cerastar ZWE 24-3 MFA boiler?
What is the brand "GZT 3" that appears on the orange relay of this PCB?
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