Viessmann Vitodens 100-W WB1B Control PCB Ref. 7550762
The control PCB of the Viessmann Vitodens 100-W WB1B manages the ignition, burner modulation, pump, and safety features of the boiler. When it fails, the boiler may not start, lock out, or behave erratically. Users may notice fault codes such as F0, FC, FD, or FF. This PCB is compatible with several models in the Vitodens 100-W WB1B range, including versions of 13 kW, 16 kW, 19 kW, 26 kW, and 35 kW, among others. It should be replaced when symptoms of malfunction or errors in the system occur.
VAT included
Consult via WhatsAppViessmann boilers compatible with reference 7841525
PCB with reference 7841525. Five confirmed compatibilities: Vitodens 100-W WB1B 13 kW and Vitodens 100-W WB1B 16 kW.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Viessmann Vitodens 100-W WB1B 13 kW | Vitodens 100-W WB1B | Contrasted |
| Viessmann Vitodens 100-W WB1B 16 kW | Vitodens 100-W WB1B | Contrasted |
| Viessmann Vitodens 100-W WB1B 19 kW | Vitodens 100-W WB1B | Contrasted |
| Viessmann Vitodens 100-W WB1B 26 kW | Vitodens 100-W WB1B | Contrasted |
| Viessmann Vitodens 100-W WB1B 35 kW | Vitodens 100-W WB1B | 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 ref. 7841525 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 7841525. 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 7841525 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
Every time there is a power outage, the boiler loses the time and programming.
Cause: The battery that maintains the clock and memory settings is depleted, or the PCB is not charging it.
Check the status and contact of the CR2032 battery before declaring the PCB faulty.
- 02
The boiler is completely dead, with no indicator lights on.
Cause: Failure in the power stage of the PCB that prevents the rest of the electronics from starting.
Check that the mains power is reaching and that the fuses in the installation have not blown before replacing the PCB.
- 03
A lockout code appears that doesn't disappear no matter how many times you press the reset button.
Cause: The PCB does not complete its internal start-up cycle even though it receives the reset command.
Cut the main power to the boiler for a couple of minutes and restore power before replacing the PCB.
- 04
The remote control freezes or stops displaying data.
Cause: Loss of communication between the PCB and the control due to a fault in the PCB module itself.
Check that the code recorded on your PCB (7550762) matches yours and inspect the control cable before purchasing.
Fault codes Viessmann that this part solves
| Code | Fault | Diagnosis and solution |
|---|---|---|
| F0 | Internal fault (replace control unit). | The PCB/control board has an internal fault. Check by ruling out ionisation/sensor issues and performing a reset; if it reappears, replace the PCB/control unit. |
| FC | Defective fan electrical control (control unit). | The fan control stage on the PCB is damaged. Check the fan, power supply, and fan harness; if everything is correct, replace the control unit/PCB. |
| FD | Fault in the burner control board. | Fault in the control unit electronics (PCB). Check electrodes/cables and possible EMC interferences; if it persists, replace the control unit/PCB. |
| FF | Fault in the burner control board. | Fault in the control electronics; after checking ignition/cables and interferences, the manufacturer advises replacing the control unit/PCB if the fault persists. |
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 Viessmann 7841525 PCB.
- Catalogue reference
- 7841525
- Brand
- Viessmann
- Type of part
- PCBs (control boards)
- Units in stock
- 2 units
- 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.
- Code printed on the PCB
- 7550762
- CE marking
- Present
- Battery
- Panasonic CR2032
Frequently asked questions about the PCB 7841525
Does this PCB have the Viessmann logo engraved?
Is this PCB suitable for a Vitodens 100-W WB1C?
Do I need to change anything else when replacing this PCB, like the battery?
Is it also compatible with the Vitodens 100-W WB1B?
