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

Junkers Novatherm ZW 20 1 AME23 S2805 PCB Ref. 8748300371

Stock · 12 units

The Junkers Novatherm ZW 20 1 AME23 S2805 PCB is the component responsible for controlling the ignition, burner modulation, pump, and safety features of the boiler. If it malfunctions, the boiler may fail to start, become locked, or operate erratically, and the fault code F7 may appear, indicating an incorrect ionization signal. This board is compatible with the Junkers Novastar ZW20 range, including models such as ZW20-1AME23 and ZW20-1KE23, among others. It is recommended to replace it when problems are detected in the starting or overall operation of the boiler.

VAT included

Compatibility

Junkers boilers compatible with reference 8748300371

PCB with reference 8748300371. 12 verified compatibilities: ZW20-1AME23 and ZW20-1AME31.

Proven compatibility

Boiler modelFamilyVerification
Junkers ZW20-1AME23Junkers Novastar ZW20Contrasted
Junkers ZW20-1AME31Junkers Novastar ZW20Contrasted
Junkers ZW20-1KE23Junkers Novastar ZW20Contrasted
Junkers ZW20-1KE31Junkers Novastar ZW20Contrasted
Junkers ZW20-2AME23Junkers Novastar ZW20Contrasted
Junkers ZW20-2AME31Junkers Novastar ZW20Contrasted
Junkers ZW20-2KE23Junkers Novastar ZW20Contrasted
Junkers ZW20-2KE31Junkers Novastar ZW20Contrasted
Junkers ZW20AME23Junkers Novastar ZW20Contrasted
Junkers ZW20AME31Junkers Novastar ZW20Contrasted
Junkers ZW20KE23Junkers Novastar ZW20Contrasted
Junkers ZW20KE31Junkers Novastar ZW20Contrasted

Can't see your model or have questions? The printed reference takes precedence. How to check it ·

Guide

How to check if ref. 8748300371 is the part for your boiler

What determines it is not the boiler model, but the reference printed on the part you already have installed.

  1. Find the reference printed on the installed part and check whether it matches the catalogue reference 8748300371. If it is not visible, do not identify the part from its shape alone.
  2. Check the full boiler model on its data plate and look for it in the model associations on this page.
  3. Compare the connections and physical body with the original part before installation.
  4. If anything is unclear, send us a photo of the marking via WhatsApp before placing your order.
Diagnosis and fault codes

Symptoms and faults that the PCB 8748300371 resolves.

The PCB controls the ignition, modulation, and safety features of the boiler. These are the typical symptoms and what to do:

Common symptoms and faults

  • 01

    The boiler does not start at all, with no lights or sound of any kind.

    Cause: The PCB is not supplying power to the other components, usually due to an internal fault in the electronics.

    Check that there is voltage at the input of the PCB before declaring it faulty.

  • 02

    A fault code is triggered and the boiler locks out as soon as you try to turn it on.

    Cause: The PCB detects an ignition anomaly or a connected sensor issue and cuts the cycle for safety.

    Note the displayed code and first rule out the sensor or component it points to, not just the PCB.

  • 03

    The room thermostat is unable to start the boiler.

    Cause: The demand signal is not arriving or is not being processed correctly on the PCB.

    Try bridging the demand terminals on the PCB to isolate whether the fault is there or in the thermostat.

  • 04

    The boiler starts up well but stops on its own after a while, intermittently.

    Cause: An internal contact fault in the electronics randomly interrupts the power supply.

    Check if the cut coincides with vibrations or knocks in the boiler, indicating a poor connection on the PCB.

Fault codes from Junkers that this part resolves.

CodeFaultDiagnosis and solution
F7Incorrect ionization signalThe boiler does not ignite properly, which could be a safety issue. If you notice that the flame does not stay lit or goes out, it is possible that the PCB is failing.

These symptoms can have more than one cause. If your boiler displays a fault code, send it to us via WhatsApp along with a photo of the labeling, and we'll tell you if this is the part.

Technical data

Data sheet for the Junkers 8748300371 PCB.

Catalogue reference
8748300371
Brand
Junkers
Type of part
PCBs (control boards)
Units in stock
12 units
Status
Refurbished
Warranty
1 year
Shipping
Delivery time shown at checkout
Return
14 days
Documentation

Manuals and technical documentation

Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.

Frequently Asked Questions

Frequently asked questions about the PCB 8748300371

Does this PCB with reference 8748300371 work for the Novatherm ZW20-1KE23S2805?
Yes, the ZW20-1KE23S2805 is among the boiler references compatible with this Novatherm PCB.
Does this PCB also fit the Novatherm ZW 20-1 KE?
Yes, the ZW 20-1 KE is listed among the boilers compatible with this PCB.
How can I tell if I need the AME or KE version of this PCB for my Novatherm?
Check the exact suffix of your boiler (AME or KE, with its code S28xx) against the list of compatible models, as there are several variants with different suffixes.

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Junkers Novatherm ZW 20 1 AME23 S2805 PCB Ref. 8748300371