Junkers Control PCB ZWA24-1A23 Ref. 87483004170
When you turn on the tap or activate the heating, the Junkers Control PCB ZWA24-1A23 Ref. 87483004170 manages the ignition and modulation of the burner, as well as the operation of the pump and the safety features of the boiler. If this part fails, you will notice that the boiler does not start, locks out, or exhibits erratic behavior. It is compatible with several models from the Eurosmart range ZWA 24, such as the ZWA 24-1 AM 23 and the ZWA 24-1 KM 23, among others. It is recommended to replace it if the reset button blinks at 1 Hz or 4 Hz, indicating ignition faults or anomalies in the flue gas evacuation.
VAT included
Consult via WhatsAppJunkers boilers compatible with reference 87483004170
PCB with reference 87483004170. Four confirmed compatibilities: ZWA 24-1 AM 23 (1A23) S2800/3500 and ZWA 24-1 AM 31 (1A31) S2800.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Junkers ZWA 24-1 AM 23 (1A23) S2800/3500 | Eurosmart ZWA 24 | Contrasted |
| Junkers ZWA 24-1 AM 31 (1A31) S2800 | Eurosmart ZWA 24 | Contrasted |
| Junkers ZWA 24-1 KM 23 (1K23) S2892 | Eurosmart ZWA 24 | Contrasted |
| Junkers ZWA 24-1 KM 31 (1K31) S2892 | Eurosmart ZWA 24 | 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. 87483004170 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.
- Find the reference printed on the installed part and check whether it matches the catalogue reference 87483004170. 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 and faults that the PCB 87483004170 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 remains locked, and the reset button does not unlock it.
Cause: The microcontroller on the PCB manages the reset; if it is damaged, the reset command is not executed.
Turn off the main power for 30 seconds and then turn it back on before concluding that the physical reset of the panel is not working.
- 02
The display flickers, turns off and on by itself, or shows random characters.
Cause: The PCB powers and controls the display; a fault in its internal circuit is first noticeable there.
Check if the blinking coincides with the start of the pump or the fan: it could be a momentary voltage drop, not the PCB.
- 03
The boiler ignites the flame but turns off after a few seconds without any apparent reason.
Cause: The PCB monitors the flame signal and cuts off the gas if it doesn't receive it as expected; a fault in that reading causes unjustified shutdowns.
Check the ionization electrode and its wiring, as it is often the most common cause of this symptom.
- 04
The heating and domestic hot water stop responding to the controls simultaneously, as if the boiler isn't listening.
Cause: All commands go through the same control board; if its logic freezes, it stops executing any command.
Try to force a test or bleed cycle if your boiler has one, to see if it responds to any controls before replacing the PCB.
Fault codes from Junkers that this part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| The reset button flashes at 1 Hz (once per second) | General fault: ignition failure/overheating or another anomaly recorded by the equipment. | The control PCB can prevent ignition or flame supervision (damage to the PCB or moisture on the board). Check by measuring outputs to ignition/ionisation and gas body at the connectors indicated by the manual (Test D) and inspecting the board for moisture or damage. |
| The reset button flashes at 4 Hz (four times per second) | Anomaly in evacuation/admission or associated elements (pressure switch, fan, NTC, encoder connector). | A fault in the control board can cause incorrect readings/management of the pressure switch/fan or the encoder connector and generate this lockout. Check with Test E from the manual (voltages and continuity to sensors/actuators) and, if there is no correct response, 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 87483004170 PCB.
- Catalogue reference
- 87483004170
- Brand
- Junkers
- Type of part
- PCBs (control boards)
- Units in stock
- 7 units
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- Delivery time shown at checkout
- Return
- 14 days
Data read on the part and in the manufacturer's documentation
What we have not been able to verify does not appear here.
- Silkscreened board number
- 8 748 300 373
- EPROM code
- 8 744 501 240 / batch BF 10 66 FD 188
- Reference code (Junkers)
- 8748300417
- Worcester Bosch equivalent
- 87483004170
Frequently asked questions about the PCB 87483004170
For which models of Junkers boilers is the Junkers ZWA24-1A23 Control PCB Ref. 87483004170 compatible?
What fault codes can this PCB present?
What EPROM code does the Junkers ZWA24-1A23 Control PCB have?
How many boiler models are compatible with this PCB?
What is the reference for this PCB?
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