Viessmann Vitopend 100 PCB Ref. 7827494
Viessmann Vitopend 100 includes the PCB that controls the ignition, burner modulation, pump, and safety features of the boiler. When this part fails, the boiler may not start, lock out, or behave erratically, displaying fault codes such as UFE, UF9, UFd, U02, or U11. It is installed in models such as Vitopend 100 WH0 and Vitopend 100 WH0A, among others. A technician must confirm through diagnosis whether it needs to be replaced when it shows signs of malfunction.
- Type of part
- PCBs (control boards)
- Status
- Refurbished
- Catalogue reference
- 7827494
- Warranty
- 1 year
Viessmann boilers compatible with reference 7827494
PCB with reference 7827494. Two confirmed compatibilities: Vitopend 100 WH0 and Vitopend 100 WH0A.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Viessmann Vitopend 100 WH0 | Viessmann Vitopend 100 | Contrasted |
| Viessmann Vitopend 100 WH0A | Viessmann Vitopend 100 | 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. 7827494 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 7827494. 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 7827494
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 thermostat is calling for heat, but the boiler does not start even though it has power and gas.
Cause: The PCB does not process the demand signal due to a fault in the input stage.
Do not force, hit, or bridge the component. Request a technical check according to the equipment manual before deciding on its replacement.
- 02
The boiler stops in the middle of a cycle and needs to be reset to continue.
Cause: An intermittent fault in the PCB causes interruptions that reset the control.
Check that the connectors and the wiring harness of the PCB are properly fitted and free of moisture.
- 03
The relay that should activate the pump or the gas valve is not switching
Cause: The output stage of the PCB that controls that component has stopped working.
Measure with a multimeter if there is voltage at the corresponding connector when the boiler should activate it, before replacing the PCB.
- 04
An error code appears on the display that does not disappear when resetting the boiler.
Cause: The control detects an internal fault and locks the equipment for safety.
Note the code and compare it with the Viessmann fault table: some codes indicate a sensor or an external component, not the PCB.
Viessmann fault codes that require diagnosis
| Code | Fault | Technical checks |
|---|---|---|
| UFE | Fault in the Brennersteuergerät (burner control unit/PCB). | Internal fault or defective parameterization of the control board (LGM27, ref. 7827494); check power supply, connectors/wiring, and board coding; if the fault persists, replace the board. |
| UF9 | Fault in the Brennersteuergerät (burner control unit/PCB). | The control board (LGM27, ref. 7827494) detects an internal fault condition; after checking electrodes/ionisation and gas, if it reappears, check connections and replace the PCB. |
| UFd | Fault in the Brennersteuergerät (burner control unit/PCB). | Recurrent internal error of the control module (LGM27, ref. 7827494); check wiring/coding and, if not restored, replace the PCB. |
| U02 | Fault in the Brennersteuergerät (burner control unit/PCB). | Anomalous defect/parameterization in the control board (LGM27, ref. 7827494); check power supply and connectors, and if it reappears, replace the board. |
| U11 | Fault in the Brennersteuergerät (burner control unit/PCB). | This symptom may be related to the part, but it does not confirm that it is faulty. A technician must check the equipment and its inspection according to the manual before deciding on a repair or replacement. |
| U0C | Fault in the Brennersteuergerät (burner control unit/PCB). | Internal error/ADC or incorrect configuration on the PCB (LGM27, ref. 7827494); check power supply, connectors X13/VR20 and, if it persists, replace the PCB. |
| U0d | Fault in the Brennersteuergerät (burner control unit/PCB). | The control board (LGM27, ref. 7827494) remains in fault/locked state; after checking external causes and performing a reset, replace the board if the fault reappears. |
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 7827494 PCB.
- Catalogue reference
- 7827494
- Uniclima internal SKU
- TC00541X
- Brand
- Viessmann
- Type of part
- PCBs (control boards)
- Units in stock
- 2 units
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- Delivery time shown at checkout
- Return
- 14 days
Frequently asked questions about the PCB 7827494
Is this PCB Ref. 7827494 suitable for the Viessmann Vitopend 100 WH0A?
Is the same PCB used for the Vitopend 100 WH0 and the WH0A?
Spare parts related to Viessmann Vitopend 100
