Junkers Bosch Cerapur Smart ZWB 28 3C 23 Control PCB Ref. 8748300914
RefurbishedBosch JunkersPCBs (control boards)

Junkers Bosch Cerapur Smart ZWB 28 3C 23 Control PCB Ref. 8748300914

90 €VAT includedIn stock · 1 unit

PCB (control board): refurbished spare part that controls the ignition, modulation, and safety features of the boiler. Useful if the boiler does not ignite, locks up, or the display does not respond. Compatible with ZWB 28-3C 23, ZWB 28-3CE 23, NWB 24-3C 23 (ref. 8748300914). Includes a one-year warranty and delivery within 2–4 working days in the EU.

1
Consult via WhatsApp
Delivery in 2–4 working days
1-year warranty
14-day return
Technical support

Key Data

Reference
8748300914
Brand
Bosch Junkers
Type of part
PCBs (control boards)
Available units
1 unit in stock
Status
Refurbished
Warranty
1 year
Shipping
2–4 working days (EU)
Return
14 days

The same part (ref. 8748300914) equips these models. Verified compatibility; check the reference before purchasing.

Cerapur Smart

  • ZWB 28-3C 23
  • ZWB 28-3CE 23
  • NWB 24-3C 23
  • NWB 24-3CE 23

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.

CodeWhat does it mean?Cause and diagnosis (this part)
F0Incorrect reference voltage (internal fault).Fault in the reference/measurement of the Heatronic 3 (5 V/ADC) on the board causes F0; if after checks and retries it continues, the manufacturer advises replacing the board. Verify reference voltages and follow the manual's flow; if it persists, change the PCB.
A8BUS communication interrupted.The BUS management (Heatronic 3) is on the PCB; a fault in the transceiver/micro or the PCB itself interrupts communication even with correct wiring/regulator. Check the BUS cable and regulator; if A8 persists, replace the PCB according to the manual.
b1Internal error or coding plug not detected/incorrect.The encoder reads the input from the PCB; if that circuit fails, b1 appears even if the encoder is correct. Restore parameters and check the encoder; if b1 continues, the procedure requires changing the PCB.
F7Flame detected while the appliance is off (false flame).The ionization stage on the PCB may leak (e.g., moisture on the PCB) and simulate a flame. Check electrodes/draught and ensure the PCB is not damp; if F7 persists, replace the PCB as indicated in the documentation.
FdThe RESET button has been pressed by mistake (flashing).If Fd does not disappear after resetting, the manual attributes it to an electronic fault (key detection/logic) of the Heatronic front panel. Retry the reset procedure; if the blinking persists, replace the PCB.
How do I know if this PCB is for my boiler?
Verify the reference 8748300914 printed and ensure your model is on the list of compatible ones; also compare the connections with the original part. It is a Junkers/Bosch (OEM) part.
What is it used for?
The PCB controls the ignition, modulation, sensor readings, and safety features of the boiler.
Is the boiler not igniting, locking out, or is the control board unresponsive?
After ruling out mains voltage, fuse, and connectors, a damaged PCB causes lockouts, blackouts, or erratic display. Repair the external cause before installing the new one.
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
After installation, a technician must adjust the service parameters (type of gas, power settings) and check combustion and safety features.
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.

Spare Parts Related Boiler PCB Control Junkers Bosch Cerapur Smart ZWB 28 3C 23

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