Junkers Cerapur Excellence Compact ZWB 30/32-1 A 23 PCB Ref. 873790949A0
The Junkers Cerapur Excellence Compact ZWB 30/32-1 A 23 Ref. 873790949A0 PCB is the component responsible for controlling the ignition, burner modulation, pump, and safety features of the boiler. When it fails, the boiler may not start, become locked, or exhibit erratic behavior. This board is compatible with the Junkers Cerapur Excellence Compact ZWB 30/32-1 A 23 model, among other options. A technician must confirm through diagnosis whether it needs to be replaced when there are ignition failures or issues with the proper functioning of the boiler.
Compatible Bosch Junkers boilers
PCB. A proven compatibility: Cerapur Excellence Compact ZWB 30/32-1 A 23.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Bosch Junkers Cerapur Excellence Compact ZWB 30/32-1 A 23 | Junkers | 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 it is the part for your boiler
The part reference, model, and equipment revision must be verified against the manufacturer's documentation.
- Find the reference printed on the installed part and check whether it matches the catalogue reference —. 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 that require diagnosis on the PCB
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
A click is heard inside the boiler, but the pump or the fan does not start.
Cause: The power relays on the PCB control these components; if a relay does not close the contact properly, the command does not reach the motor.
Check if the click occurs several times in a row without the component moving: it is an indication of a defective relay, not of the pump or the fan.
- 02
The boiler is completely dead, with no display or response to any controls.
Cause: A fault in the control module prevents the PCB from processing the power supply and starting any sequence.
Check the general electrical supply: socket, circuit breaker, and fuse of the boiler itself.
- 03
A fault code from the control module appears on the screen that does not reset.
Cause: The electronics detect an internal fault that cannot self-correct and locks the boiler to prevent further damage.
Try turning off the power and turning it back on after a minute: if the fault code reappears immediately, the fault is internal to the PCB.
- 04
The boiler randomly locks up and needs to be reset manually to function again.
Cause: A component of the PCB that has lost reliability causes intermittent faults that are difficult to reproduce.
Note when the blockage occurs (start-up, operating, shutdown): it helps to distinguish a fault in the PCB from one in the sensor.
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 Bosch Junkers PCB.
- Uniclima internal SKU
- PLBO079
- Brand
- Bosch 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
Part data and available documentation
Contrast the label codes, PCB, and revision with the installed part; they are not necessarily equivalent references.
- PCB reference
- 873790949A0
- Code on the edge of the PCB
- E122808
- Partial code on label
- SV6.0
- Power relay (x2)
- OMRON G3RL-1A-E-HR, 24V DC
Frequently asked questions about the PCB (control board)
Does this PCB work for my Junkers Cerapur Excellence Compact ZWB 30/32-1 A 23 boiler?
What relays are mounted on this PCB of the Cerapur Excellence Compact?
When should this PCB of the ZWB 30/32-1 A 23 be replaced?
