Wolf PCB FGB / FGB-K (28-35) Ref. 2745732
The control PCB of the Wolf FGB / FGB-K (28-35) boiler is responsible for managing the ignition, burner modulation, pump, and safety functions. If it fails, you will notice that the boiler does not start, locks out, or behaves erratically, potentially displaying fault code 90, which indicates a communication failure. This PCB is compatible with models such as the FGB-K-28, among others in the Wolf FGB-K range. It is advisable to replace it when these symptoms occur to restore the proper functioning of your boiler.
VAT included
Consult via WhatsAppWolf boilers compatible with reference 2745732
PCB with reference 2745732. A proven compatibility: FGB-K-28.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Wolf FGB-K-28 | Wolf FGB-K (wall-mounted gas condensing) | 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 the reference 2745732 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 2745732. 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 2745732 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 start even when you raise the thermostat, as if it is not receiving the command.
Cause: The PCB interprets the thermostat's demand and commands the ignition; if it fails, the order does not reach the burner.
First, check that the thermostat has batteries and that the wiring to the PCB is properly connected before declaring the PCB faulty.
- 02
The water temperature rises and falls without the boiler stabilizing, as if it were modulating in jumps.
Cause: This PCB manages the flame modulation, and a damaged regulation stage causes the boiler to operate in bursts instead of gradually adjusting the power.
Note the fault code if it appears on the display and compare it with the manual before replacing the PCB: it could be a dirty NTC sensor, not the PCB.
- 03
The display shows a fault code and the boiler locks itself.
Cause: The lockout codes are generated by the PCB itself when it detects an anomaly in its safety circuits.
Reset the boiler once and note if the fault code repeats the same or changes; a fixed repeated code points more to the PCB than to a specific fault.
- 04
The relay clicks, but the burner or the pump does not start.
Cause: This PCB has a Honeywell relay that sends the electrical signal to the pump and burner; if the contact is faulty, it closes but does not allow enough current to pass.
With the boiler turned off and unplugged, check if the relay makes an audible click when the power-on command is given: if it clicks but the component does not start, the problem points to the relay on the PCB.
Fault codes for Wolf that this part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| 90 | Communication FA: communication failure between the regulation PCB (HCM-2) and the combustion control board (GBC-e). | The PCB 2745732 may fail in its interface/power supply and lose the ChipCom/eBUS connection with the GBC‑e; check voltages and continuity of the HCM‑2↔GBC‑e harness and, if it persists, test/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 Wolf 2745732 PCB.
- Catalogue reference
- 2745732
- Brand
- Wolf
- Type of part
- PCBs (control boards)
- Units in stock
- 3 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.
- Manufacturer
- Wolf
- Type of PCB (label)
- FGB control board
- Equivalent reference
- 2745732 — valid for Wolf boilers FGB, FGB-K, FGB-K28, and FGB-K35
- Internal component
- Honeywell relay
Frequently asked questions about the PCB 2745732
Is this PCB Ref. 2745732 original from Wolf?
Does the PCB Ref. 2745732 from the Wolf FGB also work for the FGB-K28?
What relay is mounted on the PCB of the Wolf FGB boiler?
