Junkers PCB Control ZWA 24 1A31 Ref. 8748300417
RefurbishedBosch JunkersPCBs (control boards)

Junkers PCB Control ZWA 24 1A31 Ref. 8748300417

75 €VAT included

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 ZWA 24-1A23, ZWA 24-1A31, ZWA 24-1K23 (ref. 8748300417). Includes a one-year warranty and delivery within 2–4 working days in the EU.

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

Key Data

Reference
8748300417
Brand
Bosch Junkers
Type of part
PCBs (control boards)
Available units
0 units in stock
Status
Refurbished
Warranty
1 year
Shipping
2–4 working days (EU)
Return
14 days

The same part (ref. 8748300417) equips these models. Verified compatibility; check the reference before purchasing.

Junkers Eurosmart ZWA 24

  • ZWA 24-1A23
  • ZWA 24-1A31
  • ZWA 24-1K23
  • ZWA 24-1K31

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)1 Hz light code that groups ignition/overheating/internal fault.The PCB (Eurotronic printed circuit board) may fail in ignition management or signal reading and cause this pattern; check with Test D in the manual (voltages at ST2 L–N, spark/ionisation, and wiring) and, if everything else is correct, replace the PCB.
The reset button flashes at 4 Hz (four times per second)4 Hz light code for evacuation supervision/safety and sensors (pressure switch, fan, NTC, encoder connector).A defect in the PCB can prevent correct reading of the pressure switch/NTC/fan or managing the flue safety, generating the 4 Hz; check with Test E (pressure switch pressures, fan, continuity/wiring, and 230 V/5 V at connectors) and, if everything is fine, the PCB is faulty.
The reset button flashes at 8 Hz (eight times per second)8 Hz light code associated with the operation mode switch (Min/Max position) and its circuit.If the switch line on the board (input/UI or logic) is forced or not interpreted due to a fault in the printed circuit, it maintains the 8 Hz; check the switch itself and its wiring to the PCB, and if there are no external anomalies, replace the board.
How do I know if this PCB is for my boiler?
Verify the reference 8748300417 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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