Bosch PCB · 8 748 300 503

How to check if reference 8 748 300 503 is the spare part for your boiler

The part reference, model, and equipment revision must be verified against the manufacturer's documentation.

1. Locate 8 748 300 on the PCB and the handwritten suffix 503. The photographed unit has the Bosch silkscreen, revision 2.4, and marking 0426.
2. HT II-3 and CA CA CC are read on the label of an orange component on the PCB.
3. The inventory bag indicates Junkers ZWC 24 1MF 2A and 8748300503. Check the circuit code and the connector layout with your PCB and the breakdown of the installed version.

Technical data

Catalogue reference

8 748 300 503

Brand

Bosch

Type of part

PCBs (control boards)

Units in stock

8 units

Status

Refurbished

Warranty

1 year

Shipping

Depending on the country; cost shown at checkout

Return

14 days

Part data and available documentation

Contrast the label codes, PCB, and revision with the installed part; they are not necessarily equivalent references.

Silkscreened brand

Bosch

Code in the circuit

8 748 300
The suffix 503 is handwritten next to the code.

PCB inspection

2.4

Another marking on the PCB

0426

Orange component markings

HT II-3 · CA CA CC

Visible terminals

N · Ns · Ls · LR
Connections in the green terminal.

Annotated application in the stock market

Junkers ZWC 24 1MF 2A
Inventory data. The compatibility of the variant requires verification.