Junkers Eurosmart ZWA 24 1 AM Control PCB Ref. 8748300488
RefurbishedBosch JunkersPCBs (control boards)

Junkers Eurosmart ZWA 24 1 AM Control PCB Ref. 8748300488

95 €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 ZWA 24-1 AM 23, ZWA 24-1 AM 31, ZWA 24-1 KM 23 (ref. 8748300488). 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
8748300488
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. 8748300488) equips these models. Verified compatibility; check the reference before purchasing.

Junkers Eurosmart ZWA 24

  • ZWA 24-1 AM 23
  • ZWA 24-1 AM 31
  • ZWA 24-1 KM 23
  • ZWA 24-1 KM 31

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)
The reset button flashes at 1 Hz (once per second)Lockout due to ignition/overheating/internal fault group.The control board (Eurotronic/PCB) may fail in ignition/flame management or in powering sensors/actuators, causing this blockage. Check 230 V at ST2, signals/outputs at ST16, and if peripherals and wiring are correct, replace the board.
The reset button flashes at 4 Hz (four times per second)Lockout due to flue evacuation/safety group or associated sensors.A defect in the control board can prevent the correct management/reading of the fan, pressure switch, NTC, or the encoder connector, triggering the 4 Hz. Check connectors ST16/ST1, power supply to the fan, and continuity of sensors; if everything is okay and it persists, the board is the probable cause.
How do I know if this PCB is for my boiler?
Verify the reference 8748300488 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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