What does fault code E0 mean in Bosch Junkers?

Fault in the electronic box (internal fault of the module/PCB). Internal defect of the control board (Heatronic/PCB). Verify with reset and basic check; if the error persists, diagnose/replace the board.

What does the fault code F0 mean in Bosch Junkers?

Internal fault (internal fault of the control unit). Internal anomaly of the electronic control; the manufacturer advises checking connections and, if necessary, replacing the 'control unit'/PCB. Verify by resetting and checking wiring; if it reappears, replace the PCB.

What does the fault code F1 mean in Bosch Junkers?

Internal data error. Data error in the Heatronic 3 (control/PCB). Check with 'reset to factory settings' (function 8.E); if not resolved or reappears, the probable cause is the PCB and it should be replaced.

What does the fault code b2 mean in Bosch Junkers?

Internal data error. Internal data fault in the electronics (Heatronic/PCB). Check connections and perform 'factory reset' (8.E); if the code reappears, Bosch documents replacing the control/PCB as a solution.

RefurbishedBosch Junkers PCBs (control boards)

Junkers Cerapur Excellence ZWBE 42-2 A23 PCB Ref. 8748300905

Name: Junkers Cerapur Excellence ZWBE 42-2 A23 PCB Ref. 8748300905
Brand: Bosch Junkers
SKU: PLBO156
Price: 120 EUR
Availability: InStock

120 €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 out, or the display is unresponsive. Reference 8748300905. Includes a one-year warranty and delivery within 2–4 working days in the EU.

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Delivery in 2–4 working days

1-year warranty

14-day return

Technical support

Key Data

Reference: 8748300905
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

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)
E0	Fault in the electronic box (internal fault of the module/PCB).	Internal fault of the control board (Heatronic/PCB). Verify with reset and basic check; if the error persists, diagnose/replace the board.
F0	Internal fault (internal fault of the control board).	Internal anomaly of the electronic control; the manufacturer advises checking connections and, if necessary, replacing the control board/PCB. Verify by resetting and checking wiring; if it reappears, replace the PCB.
F1	Internal data error.	Data error in the Heatronic 3 (control board/PCB). Check with 'reset to factory settings' (function 8.E); if not resolved or reappears, the probable cause is the PCB and it should be replaced.
b2	Internal data error.	Internal data fault in the electronics (Heatronic/PCB). Check connections and perform a 'factory reset' (8.E); if the code reappears, Bosch documents the replacement of the control board/PCB as a solution.

Junkers Cerapur Excellence ZWBE 42-2 A23 PCB Ref. 8748300905

Key Data

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