Viessmann Vitodens 100-W PCB Ref. 7870767
If your boiler does not start, locks out, or behaves erratically, a technical diagnosis must confirm whether you 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. A technician must confirm through diagnosis whether it needs to be replaced upon detecting these symptoms to restore the boiler's operation.
Viessmann 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
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 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 that require diagnosis on the PCB 7870767
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.
Viessmann fault codes that require diagnosis
| Code | Fault | Technical checks |
|---|---|---|
| Fd | Burner blocked due to error in the control board (burner control/electronics). | This code requires technical diagnosis according to the model manual and its review. It does not confirm on its own that this part is faulty nor justifies its replacement. The causes and the exact reference must be verified before intervening. |
| FF | Burner blocked due to error in the control board (burner control/electronics). | This code requires technical diagnosis according to the model manual and its review. It does not confirm on its own that this part is faulty nor justifies its replacement. The causes and the exact reference must be verified before intervening. |
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
- Uniclima internal SKU
- PLVI064X
- Brand
- Viessmann
- Type of part
- PCBs (control boards)
- Units in stock
- 4 units
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- Delivery time shown at checkout
- 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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