Vaillant PCB VMW 255 4 7 R3 Ref. 0020136649
RefurbishedVaillantPCBs (control boards)

Vaillant PCB VMW 255 4 7 R3 Ref. 0020136649

105 €VAT includedIn stock · 1 unit

PCB (control board): refurbished spare part that controls the ignition, modulation, and safety features of the boiler. Useful if the boiler does not ignite, locks up, or the display does not respond. Compatible with VMW 255/4-7, VMW 255/4-7 R3, VMW 21/245/4-5 (ref. 0020136649). Includes a one-year warranty and delivery within 2–4 working days in the EU.

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Delivery in 2–4 working days
1-year warranty
14-day return
Technical support

Key Data

Reference
0020136649
Brand
Vaillant
Type of part
PCBs (control boards)
Available units
1 unit in stock
Status
Refurbished
Warranty
1 year
Shipping
2–4 working days (EU)
Return
14 days

The same part (ref. 0020136649) equips these models. Verified compatibility; check the reference before purchasing.

VMW 255/4-7 (turboTEC/atmoTEC)

  • VMW 255/4-7
  • VMW 255/4-7 R3

VMW 21/245/4-x

  • VMW 21/245/4-5
  • VMW 21/245/4-3 R3
  • VMW 21/245/4-5 R3

Fault codes related to this part (not the entire boiler). They usually have more possible causes: first rule out electrodes, wiring/connections, and gas supply. Verified with ≥3 sources.

CodeWhat does it mean?Cause and diagnosis (this part)
F.27Safety shutdown: flame detection error (flame simulation).The PCB 0020136649 incorporates flame control; if its ionization/ASIC circuit is damaged (moisture/drift), it may interpret a non-existent flame. Check the ionization signal on the PCB and rule out electrode/cable and leaks in the gas valve.
F.61Gas valve activation/control error.Gas driver/output fault on PCB 0020136649 prevents proper supply to the valve. Check voltage/signal from the PCB to the valve connector and rule out wiring and valve.
F.62Gas valve disconnection delay.A defect in the electronics of PCB 0020136649 may keep the valve energized longer than necessary. Check that the closing signal from the PCB drops in time and that there is no parasitic light/defective valving.
F.63Fault: EEPROM (memory).Corruption/read-write of the EEPROM on the PCB 0020136649. Confirm with diagnosis, attempt reprogramming/adjustment and, if it persists, replace the PCB.
F.64Error: electronics / sensor (A/D/NTC transformer).Fault in the measurement electronics of PCB 0020136649 causes implausible NTC/analogue input readings. Check NTC/wiring and measure inputs on the PCB; if they are correct, the PCB is faulty.
F.65Error: electronics temperature too high.Overheating or internal fault in the electronics of PCB 0020136649. Check ventilation/environment, temperature in the electronic box, and inspect the PCB for discolorations/damage.
F.67Fault: electronics/flame (flame signal not plausible).Flame signal processing error by the electronics of PCB 0020136649. Check grounding, electrode/cable, and if ionisation is correct, replace PCB.
F.70Invalid product/appliance code (DSN).After replacing the display and PCB 0020136649 simultaneously without reprogramming the DSN, the boiler enters F.70. Verify and enter the correct DSN in D.93 according to the model manual.
How do I know if this PCB is for my boiler?
Verify the reference 0020136649 printed and ensure your model is on the list of compatible ones; also compare the connections with the original part.
What is it used for?
The PCB controls the ignition, modulation, sensor readings, and safety features of the boiler.
Is the boiler not igniting, locking out, or is the control board unresponsive?
After ruling out mains voltage, fuse, and connectors, a damaged PCB causes lockouts, blackouts, or erratic display. Repair the external cause before installing the new one.
Which models is it suitable for?
Part shared by various models (see Compatibility). If your model does not appear, send us a photo of the marking and we will confirm it.
Installation and recommendations
After installation, a technician must adjust the service parameters (type of gas, power settings) and check combustion and safety features.
What does refurbished mean and what coverage does it have?
Part removed from a boiler out of service, inspected and tested. Includes 1-year warranty and 14-day return policy. Delivery within 2–4 working days in the EU.

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