Junkers Electronic Module ZWR 24 2ADE 23 Ref. 8748300034
If your boiler does not start, locks out, or exhibits erratic behavior, you may need the Junkers ZWR 24 2ADE 23 Electronic Module Ref. 8748300034. This control PCB governs the ignition, burner modulation, pump, and safety features of the boiler. Among the fault symptoms, you might see errors such as E0, F0, b1, b2, or d8. It is compatible with models such as the ZWR 11-2 KE 23, ZWR 18-2 AE 23, and ZSR 24-2 AE 23, among others. It should be replaced when faults in its operation or errors in the system are detected.
VAT included
Consult via WhatsAppJunkers boilers compatible with reference 8748300034
PCB with reference 8748300034. 20 verified compatibilities: ZWR 11-2 KE 23 and ZWR 11-2 AE 23.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Junkers ZWR 11-2 KE 23 | ZWR (heating + instantaneous DHW) -1/-2 KE/AE | Contrasted |
| Junkers ZWR 11-2 AE 23 | ZWR (heating + instantaneous DHW) -1/-2 KE/AE | Contrasted |
| Junkers ZWR 18-2 KE 23 | ZWR (heating + instantaneous DHW) -1/-2 KE/AE | Contrasted |
| Junkers ZWR 18-2 AE 23 | ZWR (heating + instantaneous DHW) -1/-2 KE/AE | Contrasted |
| Junkers ZWR 24-2 KE 23 | ZWR (heating + instantaneous DHW) -1/-2 KE/AE | Contrasted |
| Junkers ZWR 24-2 AE 23 | ZWR (heating + instantaneous DHW) -1/-2 KE/AE | Contrasted |
| Junkers ZSR 11-2 KE 23 | ZSR (heating + storage tank) -1/-2 KE/AE | Contrasted |
| Junkers ZSR 11-2 AE 23 | ZSR (heating + storage tank) -1/-2 KE/AE | Contrasted |
| Junkers ZSR 18-2 KE 23 | ZSR (heating + storage tank) -1/-2 KE/AE | Contrasted |
| Junkers ZSR 18-2 AE 23 | ZSR (heating + storage tank) -1/-2 KE/AE | Contrasted |
| Junkers ZSR 24-2 KE 23 | ZSR (heating + storage tank) -1/-2 KE/AE | Contrasted |
| Junkers ZSR 24-2 AE 23 | ZSR (heating + storage tank) -1/-2 KE/AE | Contrasted |
| Junkers ZR 18-2 KE 23 | ZR (heating only) -1/-2 KE/AE | Contrasted |
| Junkers ZR 18-2 AE 23 | ZR (heating only) -1/-2 KE/AE | Contrasted |
| Junkers ZR 24-2 KE 23 | ZR (heating only) -1/-2 KE/AE | Contrasted |
| Junkers ZR 24-2 AE 23 | ZR (heating only) -1/-2 KE/AE | Contrasted |
| Junkers Mini 8 KE 23 | Mini KE/AE | Contrasted |
| Junkers Mini 11 KE 23 | Mini KE/AE | Contrasted |
| Junkers Mini 8 AE 23 | Mini KE/AE | Contrasted |
| Junkers Mini 11 AE 23 | Mini KE/AE | 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 the reference 8748300034 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 8748300034. 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 8748300034 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
You press the power button and nothing happens: no spark, no fan, no indicators.
Cause: The PCB is not sending power to the actuators, so the boiler does not start even though there is gas and electricity.
Check that the main switch and the fuse of the installation are functioning properly, and that there is voltage at the input of the PCB.
- 02
The boiler heats for a while and then shuts off by itself, without you having touched anything.
Cause: The PCB cuts off the gas if it detects a fault in the safety signals, whether due to its own fault or that of another component.
Check if there is an error message visible at the time of the cut: it will indicate if the PCB points to an external sensor before replacing it.
- 03
The display turns off and on by itself, or blinks for no apparent reason.
Cause: A fault in the power supply of the PCB causes intermittent cuts in the control electronics.
Check that the boiler is not in a damp area or with condensations that could affect the contacts of the PCB.
- 04
You have changed the pump or the gas valve and the boiler still won't start.
Cause: If the output relay on the PCB that activates that component is damaged, the new part does not receive a command even if it is in good condition.
With the boiler turned off and unplugged, check the continuity of the corresponding relay on the PCB before discarding the new part.
Fault codes from Junkers that this part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| E0 | Internal fault in the PCB. | Electronic module defect causes self-diagnosis error; after cutting power for 1–2 minutes and checking voltages/connectors, if it reappears, the PCB is replaced. |
| F0 | Internal fault (hardware) in the control board. | Hardware/firmware error in the control board; confirm with reset and visual/electrical check; if it persists, replace the module according to the service manual. |
| b1 | The coder (Kodierstecker) is not recognized by the PCB. | The PCB does not read the device identifier (fault in the PCB or the encoder itself); check the seating/value of the Kodierstecker and, if correct, replace the PCB. |
| b2 | Internal data error (memory/parameterization) in the electronics. | Data corruption in the PCB (EEPROM/Heatronic parameterization); try service reset (Function 8) and check the fuse on the PCB; if it persists, replace the PCB. |
| d8 | Internal fault of the base module (Grundmodul). | Main module/PCB fault; Heatronic diagnosis indicates replacing the base module after ruling out other causes. |
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 8748300034 PCB.
- Catalogue reference
- 8748300034
- Brand
- Junkers
- Type of part
- PCBs (control boards)
- Units in stock
- 1 unit
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- Delivery time shown at checkout
- Return
- 14 days
Frequently asked questions about the PCB 8748300034
Does this PCB work for the Junkers ZWR18-2ADE23?
How do I check if this PCB is the one for my Junkers boiler?
Does this PCB work for both the Junkers Mini-8AE21 and the Mini-11AE23?
Spare parts related to Junkers ZWR (heating + instantaneous domestic hot water) -1/-2 KE/AE
