PCB Vaillant Group Saunier Duval Thema NOx F25 B 2 Ref. 0020184123
Main PCB for Saunier Duval / Hermann Saunier Duval boilers, PCB model PM-02. The manufacturer of the PCB is Vaillant Group; the relays K101 and K102, brand Zettler (AZ9362-1CE-24D(200)), are a separate component, not the manufacturer of the PCB. The label code (0020183525) corresponds to the commercial reference 0020184123. Replacement requires first confirming the fault of the part through technical diagnosis, even when the control board is faulty.
- Type of part
- PCBs (control boards)
- Status
- Refurbished
- Catalogue reference
- 0020184123
- Warranty
- 1 year
Saunier Duval boilers compatible with reference 0020184123
PCB with reference 0020184123. Six confirmed compatibilities: F 25 B and F 25 B/2.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Saunier Duval F 25 B | NOX Thema | Contrasted |
| Saunier Duval F 25 B/2 | NOX Thema | Contrasted |
| Saunier Duval F 25 B GN/BP | NOX Thema | Contrasted |
| Saunier Duval F 25 A LPG/GN | Themafast NOX | Contrasted |
| Saunier Duval F 30 NL/LL | Themafast NOX | Contrasted |
| Saunier Duval 24 B2 | Micraplus NOX | 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. 0020184123 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 0020184123. If it is not visible, do not identify the part by 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 0020184123
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 ignites the burner without being asked for heat.
Cause: A relay on the PCB gets stuck and supplies power without real demand.
Disconnect the room thermostat; if it continues to turn on by itself, the relay on the PCB is the problem.
- 02
A repeated clicking sound is heard from the boiler even when it is not running.
Cause: It is a relay on the PCB that opens and closes repeatedly due to a fault in its coil or control circuit.
Open the casing and locate the click; if it comes from the PCB, do not look elsewhere.
- 03
The boiler stops responding and needs to be unplugged to work again.
Cause: A hang-up of the PCB blocks communication until power is cut and restored.
If the problem recurs after each power outage within less than a day, it is an indication that the PCB is failing.
- 04
The boiler ignites the burner, but the circulation pump does not start.
Cause: The order to the pump goes through a relay on the PCB, and if that relay does not close, the pump does not receive power.
Test the pump directly on the mains to confirm that it works before blaming the PCB.
Fault codes Saunier Duval that require diagnosis
| Code | Fault | Technical checks |
|---|---|---|
| F63 | Main PCB fault | The EEPROM/electronics of the main board is damaged or corrupted, causing the equipment to lock. Check the board voltages, connections, and if the issue persists, replace/reprogram the PCB 0020184123. |
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 Saunier Duval PCB 0020184123
- Catalogue reference
- 0020184123
- Uniclima internal SKU
- PLCTMNXF25
- Brand
- Saunier Duval
- Type of part
- PCBs (control boards)
- Units in stock
- 21 units
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- Delivery time shown at checkout
- Return
- 14 days
Part data and available documentation
Contrast the label codes, PCB, and revision with the installed part; they are not necessarily equivalent references.
- Manufacturer of the PCB (on the silkscreen 'V-Group')
- Vaillant Group
- PCB model
- PM-02
- Code printed on the PCB
- 0020183525, batch 3512 0309 G
- Power supply connector voltage
- 230V
- Auxiliary connector voltage
- 24V
- K101/K102 relays
- Zettler AZ9362-1CE-24D(200), coil 24V, contact 8A 250VAC/30VDC, Made in China
- Contact current of relays K101/K102 (alternative value, unresolved)
- 6A 250VAC/30VDC
- The relays K101 and K102 are from the brand Zettler; do not confuse that brand with the manufacturer of the PCB.
Manuals and technical documentation
Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.
- Saunier Duval F 25 B/2 Manual (PDF)Document © Saunier Duval, provided as a technical reference.
Frequently asked questions about the PCB 0020184123
Who manufactures the PCB of the Saunier Duval Thema NOX F25 B 2, Vaillant Group or Zettler?
Is the code 0020183525 on the label the same part as Ref. 0020184123?
Does this PCB work for a Hermann Micraplus NOX 24?
What voltage does the auxiliary connector of this Vaillant Group PCB have?
When should the PCB of the Saunier Duval Thema NOX F25 B 2 be replaced?
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