Honeywell PCB Junkers Euroline ZW23 1KE31 Bosch Ref. 87083002120
If your boiler does not start, locks out, or exhibits erratic behavior, you may need the Honeywell Junkers Euroline ZW23 1KE31 Bosch Ref. 87083002120 PCB. This control board is responsible for managing the ignition, burner modulation, pump, and safety features of the boiler. Symptoms of failure include the reset button flashing at 0.5 Hz or 4 Hz, indicating issues with the ionization signal or the printed circuit. It is compatible with several models from the Junkers Euroline range, such as the ZW23-1KE31 and the ZS23-1AE31, among others. It is recommended to replace it when these symptoms or operational faults are detected.
Bosch Junkers boilers compatible with reference 87083002120
PCB with reference 87083002120. 22 verified compatibilities: ZW23-1AE23 and ZW23-1AE31.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Bosch Junkers ZW23-1AE23 | Junkers Euroline ZW (combi) | Contrasted |
| Bosch Junkers ZW23-1AE31 | Junkers Euroline ZW (combi) | Contrasted |
| Bosch Junkers ZW23-1KE23 | Junkers Euroline ZW (combi) | Contrasted |
| Bosch Junkers ZW23-1KE31 | Junkers Euroline ZW (combi) | Contrasted |
| Bosch Junkers ZW24-1ELH AE23 | Junkers Euroline ZW (combi) | Contrasted |
| Bosch Junkers ZW24-1ELH AE31 | Junkers Euroline ZW (combi) | Contrasted |
| Bosch Junkers ZW28-1LHKE23 | Junkers Euroline ZW (combi) | Contrasted |
| Bosch Junkers ZW28-1LHKE31 | Junkers Euroline ZW (combi) | Contrasted |
| Bosch Junkers ZW30-1LHAE23 | Junkers Euroline ZW (combi) | Contrasted |
| Bosch Junkers ZW30-1LHAE31 | Junkers Euroline ZW (combi) | Contrasted |
| Bosch Junkers ZS23-1AE23 | Junkers Euroline ZS (heating only) | Contrasted |
| Bosch Junkers ZS23-1AE31 | Junkers Euroline ZS (heating only) | Contrasted |
| Bosch Junkers ZS23-1KE23 | Junkers Euroline ZS (heating only) | Contrasted |
| Bosch Junkers ZS23-1KE31 | Junkers Euroline ZS (heating only) | Contrasted |
| Bosch Junkers NW24-1LHAE23 | Junkers Euroline NW24 | Contrasted |
| Bosch Junkers NW24-1LHAE31 | Junkers Euroline NW24 | Contrasted |
| Bosch Junkers NW24-1LHKE23 | Junkers Euroline NW24 | Contrasted |
| Bosch Junkers NW24-1LHKE31 | Junkers Euroline NW24 | Contrasted |
| Bosch Junkers NW24/28-1LHKE23 | Junkers Euroline NW24 | Contrasted |
| Bosch Junkers NW24/28-1LHKE31 | Junkers Euroline NW24 | Contrasted |
| Bosch Junkers NW24/30-1LHAE23 | Junkers Euroline NW24 | Contrasted |
| Bosch Junkers NW24/30-1LHAE31 | Junkers Euroline NW24 | 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. 87083002120 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 87083002120. If it is not visible, do not identify the part by 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 87083002120 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 turn on and there are no indicator lights on the panel.
Cause: There is no power reaching the PCB, so the other components cannot start.
Check the fuse on the PCB and the power supply before assuming that the board is faulty.
- 02
An intermittent fault code appears that disappears and then reappears.
Cause: The PCB responds to sensor readings; an internal fault can cause erratic readings.
Record the code each time it appears and compare it with the fault code table; if it always matches the same sensor, test that component first.
- 03
The flame ignites but cuts off after a few seconds and the boiler locks out.
Cause: The PCB controls the flame and safety signal; if its circuit fails, it interprets a fault even if the burner is operating.
Check the ionization electrode and its wiring before replacing the PCB, as it is the most common cause of this symptom.
- 04
The digital control remains frozen or does not change screens.
Cause: The microcontroller on the PCB manages communication with the display; if it gets damaged, the remote control stops working.
Turn the boiler off and on from the main switch to rule out a temporary freeze before replacing the PCB.
Fault codes for Bosch Junkers that this part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| Reset button flashing 0.5 Hz + LED 75 °C | During ignition: ionisation signal is detected but the burner does not ignite. | The printed circuit board (PCB 87083002120) may fail in the detection/ionisation path or be damp, causing false flame or lack of spark; check ionisation microamperage, wiring, and moisture/oxidation on the PCB before replacing it. |
| Reset button flashes at 4 Hz (four times per second) | Control/safety fault (encoder/sensors) including possible PCB defect. | Fault in the PCB (Eurotronic/PCB) in managing inputs/power supplies; check voltages at ST2 (L–N/LR–N), fuses F1/F2, and 5 V to sensors. If everything is correct and the symptom persists, replace the 87083002120. |
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 Bosch Junkers PCB 87083002120
- Catalogue reference
- 87083002120
- Brand
- Bosch Junkers
- Type of part
- PCBs (control boards)
- Units in stock
- 0 units
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- 1-2 business days
- 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.
- Manufacturer of the PCB (silkscreen)
- Honeywell
- PCB code
- 45.007.351-005 REV.P
- Voltage
- 230VAC
- Frequency
- 50Hz
- Power
- 10VA
- Manufacturing date (of the photographed unit)
- SEP-2005
Manuals and technical documentation
Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.
- Bosch Junkers ZW23-1KE23 manual (PDF)Document © Bosch Junkers, provided as a technical reference.
Frequently asked questions about the PCB 87083002120
Which models are compatible with the Honeywell Junkers Euroline ZW23 1KE31 Bosch PCB Ref. 87083002120?
Who manufactures the Honeywell PCB for the Junkers Euroline?
What is the exact code for this Honeywell PCB for Junkers Euroline?
What power supply does the PCB for the Junkers Euroline need?
Is this PCB compatible with any Junkers Euroline model?
What is the reference for the Honeywell PCB for Junkers Euroline?
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