Viessmann Vitodens 100-W PCB Ref. 7870767
If your boiler does not start, locks out, or behaves erratically, you may need the Viessmann Vitodens 100-W PCB. This part is responsible for controlling the ignition, burner modulation, pump, and safety features of the boiler. When it fails, you may receive the fault codes Fd or FF, indicating a problem with the burner control unit. It is compatible with several models from the Vitodens 100-W range, such as the B1HC 19kW, B1HC 26kW, and B1KC 35kW, among others. It is recommended to replace it upon detecting these symptoms to restore the boiler's operation.
VAT included
Consult via WhatsAppViessmann boilers compatible with reference 7870767
PCB with reference 7870767. Five confirmed compatibilities: B1HC 19kW and B1HC 26kW.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Viessmann B1HC 19kW | Vitodens 100-W | Contrasted |
| Viessmann B1HC 26kW | Vitodens 100-W | Contrasted |
| Viessmann B1HC 35kW | Vitodens 100-W | Contrasted |
| Viessmann B1KC 26kW | Vitodens 100-W | Contrasted |
| Viessmann B1KC 35kW | Vitodens 100-W | 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. 7870767 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 7870767. 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 7870767 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, with no display or lights.
Cause: The PCB does not receive or distribute power to the boiler.
Measure if 230V is reaching the PCB and check that the internal fuse is not blown.
- 02
The display shows an error that reappears when trying to reset.
Cause: The microcontroller on the PCB detects a fault and locks the operation for safety.
Note the fault code and check it in the Viessmann fault code manual before changing the PCB: it could be a problem with a sensor, not with the control.
- 03
The boiler turns off by itself and needs to be reset to work again.
Cause: An intermittent fault in the PCB causes micro-cuts that reset the control.
Check that the connectors of the wiring harness on the PCB are properly connected and free of corrosion before replacing it.
- 04
It does not respond to the control or programming, although it seems to have power.
Cause: The PCB does not process the signal from the regulator or the timer program.
Check if the fault persists with the remote control disconnected and the boiler in manual mode before considering the PCB as faulty.
Fault codes Viessmann that this part solves
| Code | Fault | Diagnosis and solution |
|---|---|---|
| Fd | Burner blocked due to error in the control board (burner control/electronics). | The regulation electronics itself detects an internal fault in the burner control unit and locks the equipment; after ruling out ignition electrodes, interconnection wiring, and electromagnetic interference (EMI) and pressing Reset, if it persists, the official documentation indicates 'replace the regulation', meaning this PCB. Verify by resetting and, if the Fd lock reappears without an external cause, the PCB is the part to replace. |
| FF | Burner blocked due to error in the control board (burner control/electronics). | Same origin as Fd: internal fault of the burner control unit that locks the boiler; after checking electrodes, wiring, and absence of interference (EMC) and resetting, the indication is 'if not resolved, replace the regulation', which points to this PCB. Verify with Reset; if FF persistently returns without external cause, replace the PCB. |
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 7870767 PCB.
- Catalogue reference
- 7870767
- Brand
- Viessmann
- Type of part
- PCBs (control boards)
- Units in stock
- 4 units
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- 1-2 business days
- Return
- 14 days
Frequently asked questions about the PCB 7870767
Is this PCB Ref. 7870767 suitable for the Viessmann Vitodens 100-W B1HC-19?
Is it the same PCB for the Vitodens 100-W B1HK and the B1KC-26?
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