Junkers PCB ZWE24-2AE23 - Ref. 8748300158

Junkers boilers compatible with reference 8748300158

PCB with reference 8748300158. 23 verified compatibilities: ZWE24-1ADE23S28 and ZWE24-1ADE31S28.

Proven compatibility

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. 8748300158 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 8748300158. 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.

Symptoms and faults that the PCB 8748300158 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 two-digit display shows a fixed fault code that does not clear when resetting the boiler.

  Cause: The microprocessor on the PCB displays any faults it detects during ignition or safety.

  Note the exact code and compare it with the fault code table of Junkers/Bosch before assuming that the PCB is damaged.

• 02

  The boiler is not responding, and the display does not turn on.

  Cause: If the PCB does not power the display and the rest of the circuit, the unit shows no signs of operation.

  First, check the fuse of the safety module before replacing the entire PCB.

• 03

  The flame is always at maximum, it does not decrease even when the water is hot.

  Cause: The modulation depends on the signal that the PCB sends to the gas valve; if this signal fails, the flame remains fixed at maximum power.

  Check that the temperature sensor is properly connected; a loose sensor can also keep the flame at maximum.

• 04

  The remote control or programmer does not affect the boiler.

  Cause: The PCB receives the command from the control and converts it into ignition; if the communication module fails, the command is lost.

  Try to directly bridge the thermostat on the PCB to rule out that the problem is with the control and not with the board.

• 05

  The fuse on the PCB blows when turning on the boiler.

  Cause: A fuse that blows immediately usually indicates a short circuit in the connected components, not necessarily on the PCB itself.

  Before replacing it, disconnect the pump, gas valve, and fan one by one and check if the fuse holds without them.

Fault codes from Junkers that this part resolves.

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 8748300158 PCB.

Catalogue reference

8748300158

Brand

Junkers

Type of part

PCBs (control boards)

Units in stock

1 unit

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.

Safety module voltage (red block)

24 V

Safety circuit fuse

T1,6A

Additional marking red module

TO5A

Reference (Junkers/Bosch)

8748300158