Junkers Novatherm ZW 20 1 AME23 S2805 PCB Ref. 8748300371
RefurbishedJunkersPCBs (control boards)

Junkers Novatherm ZW 20 1 AME23 S2805 PCB Ref. 8748300371

110 €VAT includedIn stock · 13 units

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 ZW20-1AME23, ZW20-1AME31, ZW20-1KE23 (ref. 8748300371). 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
8748300371
Brand
Junkers
Type of part
PCBs (control boards)
Available units
13 units in stock
Status
Refurbished
Warranty
1 year
Shipping
2–4 working days (EU)
Return
14 days

The same part (ref. 8748300371) equips these models. Verified compatibility; check the reference before purchasing.

Junkers Novastar ZW20

  • ZW20-1AME23
  • ZW20-1AME31
  • ZW20-1KE23
  • ZW20-1KE31
  • ZW20-2AME23
  • ZW20-2AME31
  • ZW20-2KE23
  • ZW20-2KE31
  • ZW20AME23
  • ZW20AME31
  • ZW20KE23
  • ZW20KE31

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)
0.5 Hz (once every 2 sec.)The lockout LED flashes every 2 seconds indicating that there is a signal from the ionisation electrode even without flame ignition.The PCB may falsely interpret a flame signal (leak to ground/fault or moisture in the PCB). Check by disconnecting the ionisation cable and inspecting the ION input, ground connections, and presence of moisture on the PCB; if the symptom persists with a correct electrode and dry PCB, replace the PCB.
How do I know if this PCB is for my boiler?
Verify the reference 8748300371 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.

Spare Parts Related Boiler Novatherm ZW 20 1 AME23 S2805

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