PCB Junkers Bosch Ceraclass Excellence ZWC 35 35 3 MFA Ref. 8748300931
RefurbishedJunkersPCBs (control boards)

PCB Junkers Bosch Ceraclass Excellence ZWC 35 35 3 MFA Ref. 8748300931

70 €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 is unresponsive. Compatible with ZWC 24/28, ZWC 30/30, ZWC 35/35 (ref. 8748300931). 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
8748300931
Brand
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. 8748300931) equips these models. Verified compatibility; check the reference before purchasing.

Junkers ZWC (Euromaxx)

  • ZWC 24/28
  • ZWC 30/30
  • ZWC 35/35

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)
F0Internal fault.The PCB (printed circuit board) has an internal hardware/data fault that blocks management; the manufacturer advises replacing the PCB if, after checking power supply and connectors, the error persists. Verify by measuring voltages, checking connectors and fuses on the PCB, and, if necessary, testing with a replacement board.
F7Despite being turned off, a flame is visible on the appliance.Moisture/leakage on the PCB causes a false ionisation signal and the electronics interpret a non-existent flame. Verify by inspecting and drying the PCB, checking the ionisation circuit and ruling out condensates/leaks; if it persists, check the ionisation input on the PCB or replace it.
How do I know if this PCB is for my boiler?
Verify the reference 8748300931 printed and ensure your model is on the list of compatible ones; also compare the connections with the original 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.

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