Honeywell PCB for Junkers Ceraclass Midi ZW24 AE23 S2805 - Ref. 8708300244
The Honeywell PCB for Junkers Ceraclass Midi ZW24 AE23 S2805 is the component that controls the ignition, burner modulation, pump, and safety features of the boiler. If it has faults, you will notice that the boiler does not start, locks out, or behaves erratically. This board is compatible with several models in the Ceraclass Midi range, such as the ZW 24 AE 23 and ZW 24-2E DV AE 23 S2, among others. It is recommended to replace it when experiencing the mentioned symptoms or when receiving the fault code F0.
VAT included
Consult via WhatsAppBosch Junkers boilers compatible with reference 8708300244
PCB with reference 8708300244. Seven confirmed compatibilities: ZW 24 AE 23 and ZW 24 AE 23 S2805.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Bosch Junkers ZW 24 AE 23 | Ceraclass Midi | Contrasted |
| Bosch Junkers ZW 24 AE 23 S2805 | Ceraclass Midi | Contrasted |
| Bosch Junkers ZW 24 AE 31 S2805 | Ceraclass Midi | Contrasted |
| Bosch Junkers ZW 24 KE 23 S2895 | Ceraclass Midi | Contrasted |
| Bosch Junkers ZW 24 KE 31 S2895 | Ceraclass Midi | Contrasted |
| Bosch Junkers ZW 24-2E DV AE 23 S2 | Ceraclass Midi | Contrasted |
| Bosch Junkers ZW 24-2E DV AE 31 S2 | Ceraclass Midi | 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. 8708300244 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 8708300244. 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 PCB 8708300244 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 and the display remains completely off.
Cause: If the PCB does not distribute voltage, neither the display nor the rest of the electronics receive power.
Check the fuse on the PCB and measure the input voltage before replacing it.
- 02
The heating does not heat, but the domestic hot water does work, or vice versa.
Cause: The PCB manages the heating and domestic hot water circuits separately; a fault in one of its outputs can leave only one of the two services active.
Check that the valves and pumps of each circuit receive voltage at their terminals before blaming the PCB.
- 03
A fault code related to the transformer or power supply is triggered.
Cause: This PCB features an internal transformer of 200 VA; if its winding or power supply stage fails, the system detects it and locks out.
Measure the output voltage of the transformer with a multimeter before declaring the PCB as damaged.
- 04
The boiler turns on by itself sporadically without any demand for heating.
Cause: A relay on the PCB that does not close properly can activate the burner or the pump without a real command from the thermostat.
Disconnect the thermostat and observe if the spontaneous ignition continues to occur, to locate the fault in the PCB.
Fault codes for Bosch Junkers that this part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| F0 | Internal error in the boiler's PCB (control board). | It is the only code that the technical documentation of the Ceraclass Midi directly attributes to an internal fault of the electronic module (this same part). Verification: check connections and wiring of the PCB; if it persists after ruling out wiring, the PCB is defective and should be replaced. |
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 8708300244
- Catalogue reference
- 8708300244
- Brand
- Bosch Junkers
- Type of part
- PCBs (control boards)
- Units in stock
- 3 units
- 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.
- Component manufacturer
- Honeywell
- Transformer power
- 200 VA
Manuals and technical documentation
Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.
- Bosch Junkers ZW 24 KE 23 S2895 manual (PDF)Document © Bosch Junkers, provided as a technical reference.
Frequently asked questions about the PCB 8708300244
Who manufactures the PCB of the Junkers Ceraclass Midi ZW24 AE23 S2805?
What transformer does the PCB of the ZW24 KE31 S2895 use?
For which Junkers Ceraclass Midi models is this Honeywell PCB compatible?
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