Junkers Novatherm ZW20 KD / KD23 PCB - Ref. 8 748 300 246
When you open the hot water tap or turn on the heating, the Junkers Novatherm ZW20 KD / KD23 PCB (control board) - Ref. 8 748 300 246 is responsible for controlling the ignition and modulation of the burner, as well as the pump and safety features of the boiler. If this part fails, you will notice that the boiler does not start, locks out, or behaves erratically, possibly displaying the fault codes E0 or F0. It is compatible with models such as the ZW20-1AME23 and ZW20-2AME, among others in the Junkers Novastar ZW20 range. A technician must confirm through diagnosis whether it needs to be replaced when it shows operational faults.
- Type of part
- PCBs (control boards)
- Status
- Refurbished
- Catalogue reference
- 87483002460
- Warranty
- 1 year
Junkers boilers compatible with reference 87483002460
PCB with reference 87483002460. Five confirmed compatibilities: ZW20-1AME23 and ZW20-1AME23 S2805.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Junkers ZW20-1AME23 | Junkers Novastar ZW20 (atmospheric) | Contrasted |
| Junkers ZW20-1AME23 S2805 | Junkers Novastar ZW20 (atmospheric) | Contrasted |
| Junkers ZW20-1AME | Junkers Novatherm/Novastar ZW20 (family) | Contrasted |
| Junkers ZW20-2AME | Junkers Novatherm/Novastar ZW20 (family) | Contrasted |
| Junkers ZW20-AME | Junkers Novatherm/Novastar ZW20 (family) | Contrasted |
Can't see your model or have questions? The printed reference takes precedence. How to check it · Send us a photo via WhatsApp.
How to check if ref. 87483002460 is the part for your boiler
The part reference, model, and equipment revision must be verified against the manufacturer's documentation.
- Find the reference printed on the installed part and check whether it matches the catalogue reference 87483002460. If it is not visible, do not identify the part from its shape alone.
- Check the full boiler model on its data plate and look for it in the model associations on this page.
- Compare the connections and physical body with the original part before installation.
- If anything is unclear, send us a photo of the marking via WhatsApp before placing your order.
Symptoms that require diagnosis on the PCB 87483002460
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 or give any signal when the switch is pressed.
Cause: The PCB is not sending power to the circuits that should initiate the ignition.
Check that power is reaching the boiler's input and inspect the fuse on the PCB before replacing it.
- 02
Different fault codes appear each time, unrelated to any component you have already checked.
Cause: It's a typical symptom of a damaged PCB: the control electronics provide erratic diagnostics because the fault is within itself.
Note each fault code that appears during a day of use; if the same one doesn't repeat, the PCB is more suspect than a specific sensor.
- 03
Neither the remote control nor the thermostat can start the boiler, although it does turn on in manual mode.
Cause: The part of the PCB that receives the heat demand order from the outside is failing.
Do not force, hit, or bridge the component. Request a technical check according to the equipment manual before deciding on its replacement.
- 04
The pump or the gas valve do not activate even though the ignition sequence seems to start normally.
Cause: The relay on the PCB that controls that output may have burned out or become stuck.
Measure with the multimeter if there is power at the connector of the pump or the valve when the boiler requests ignition.
Junkers fault codes that require diagnosis
| Code | Fault | Technical checks |
|---|---|---|
| E0 | Internal fault in the PCB. | Self-diagnosis detects a fault in the PCB (control board). Check power supply and connections; if it persists after reset, replace the PCB. |
| F0 | Internal fault. | Internal fault of the control module; the PCB does not initialize or fails during startup. Check ignition contacts and cables; if it persists, replace the PCB. |
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.
Data sheet for the Junkers 87483002460 PCB.
- Catalogue reference
- 87483002460
- Uniclima internal SKU
- PLCJNOVZW20
- Brand
- Junkers
- Type of part
- PCBs (control boards)
- Units in stock
- 3 units
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- Delivery time shown at checkout
- Return
- 14 days
Part data and available documentation
Contrast the label codes, PCB, and revision with the installed part; they are not necessarily equivalent references.
- Manufacturer
- Junkers
- PCB code
- 8 748 300 246
- The current trade name sells it as 'Novatherm', but the wordmark printed on the plate is 'JUNKERS'; both names correspond to the same range of boilers, it is not a contradiction of technical data.
Frequently asked questions about the PCB 87483002460
Who manufactures the PCB for the Junkers Novatherm ZW20 KD23?
What code is printed on the PCB of the Novatherm ZW20 KD?
Is this PCB suitable for the Junkers Novatherm ZW20-1KD?
