PCB Junkers Bosch Cerapur Comfort Zwbc 30 2 C 23 Ref. 8748300923
RefurbishedBosch JunkersPCBs (control boards)

PCB Junkers Bosch Cerapur Comfort Zwbc 30 2 C 23 Ref. 8748300923

Stock · 6 units

Control PCB for boilers ZWBC 24-2, 25-2, 28-2, and 30-2, in C23 and C31 versions, including S3700 variants. It is the main board that manages the operation of the boiler. It is replaced when the electronics fail and the boiler stops operating normally.

VAT included

Compatibility

Bosch Junkers boilers compatible with reference 8748300923

PCB with reference 8748300923. Four confirmed compatibilities: ZWBC 24-2C and ZWBC 25-2C.

Proven compatibility

Boiler modelFamilyVerification
Bosch Junkers ZWBC 24-2CCerapur Comfort ZWBC (2C)Contrasted
Bosch Junkers ZWBC 25-2CCerapur Comfort ZWBC (2C)Contrasted
Bosch Junkers ZWBC 28-2CCerapur Comfort ZWBC (2C)Contrasted
Bosch Junkers ZWBC 30-2CCerapur Comfort ZWBC (2C)Contrasted

Can't see your model or have questions? The printed reference takes precedence. How to check it ·

Guide

How to check if ref. 8748300923 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 8748300923. 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.
Diagnosis and fault codes

Symptoms and faults that the PCB 8748300923 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 ignite: there are no lights, beeps, or movement from the fan.

    Cause: The PCB does not receive or distribute current, so the components of the boiler do not work.

    Check the fuse on the PCB and make sure that the main switch and the differential switch in the house are in the correct position.

  • 02

    The domestic hot water works but the heating does not, or vice versa.

    Cause: The PCB controls each circuit independently; if a relay fails, only that specific function is lost.

    Verify that the problem occurs in different tests and that it does not depend on the temperature set on the thermostat before considering the PCB as faulty.

  • 03

    The boiler suddenly stops and then works again without any issues.

    Cause: An intermittent fault on the PCB, caused by a poor connection or a component that overheats, can lead to random shutdowns.

    Record the time and conditions under which the fault occurs; if it coincides with vibrations or prolonged use, it increases suspicion about the PCB.

  • 04

    The boiler fuse keeps blowing repeatedly shortly after being replaced.

    Cause: A fuse that constantly blows indicates a short circuit on the PCB or in some component connected to it.

    Before replacing the fuse, disconnect the connectors of the pump, the gas valve, and the fan one by one to determine if the short circuit comes from outside the PCB.

Fault codes for Bosch Junkers that this part resolves.

CodeFaultDiagnosis and solution
F0Internal error.The PCB (control board) has an internal fault (e.g., A/D converter, memory, or power supply), triggering the "F0". Check voltages and wiring, encoder connections, and if the error persists after reset and testing, replace the PCB 8748300923.

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.

Technical data

Data sheet for the Bosch Junkers PCB 8748300923

Catalogue reference
8748300923
Brand
Bosch Junkers
Type of part
PCBs (control boards)
Units in stock
6 units
Status
Refurbished
Warranty
1 year
Shipping
Delivery time shown at checkout
Return
14 days
Frequently Asked Questions

Frequently asked questions about the PCB 8748300923

Is '2Y16' the reference for the PCB ZWBC 24-2/25-2/28-2/30-2?
No. By its appearance, it is a batch or factory adjustment mark, not the part reference.
What do the labels 'L N Ns Ls LR' and 'PP PO NP LP' on this PCB mean?
They are the labels of the connectors on the terminal block, not a manufacturer code.
Does this PCB fit the ZWBC 25-2 C23 S3700?
Yes, it is on the list of compatible boilers in this document, just like the C23 and C31 versions of the 24-2, 28-2, and 30-2.
When should this PCB of the ZWBC be replaced?
When the electronics fail and the boiler stops operating normally, it is the PCB that manages its operation.

Spare parts related to Bosch Junkers Cerapur Comfort ZWBC (2C)

Entrega calculada por destinoDelivery time shown at checkout
1-year warrantyreviewed and tested
14-day returnuninstalled parts
Technical supportwe verify your model
PCB Junkers Bosch Cerapur Comfort Zwbc 30 2 C 23 Ref. 8748300923