Baxi Roca Control PCB NR 15 20 Ref. 122121490
RefurbishedBaxi RocaPCBs (control boards)

Baxi Roca Control PCB NR 15 20 Ref. 122121490

105 €VAT included

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 NR-15/20 SP GN (Natural Gas), NR-15/20 SP GP (Propane Gas) (ref. 122121490). 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
122121490
Brand
Baxi Roca
Type of part
PCBs (control boards)
Available units
0 units in stock
Status
Refurbished
Warranty
1 year
Shipping
2–4 working days (EU)
Return
14 days

The same part (ref. 122121490) equips these models. Verified compatibility; check the reference before purchasing.

NR 15/20

  • NR-15/20 SP GN (Natural Gas)
  • NR-15/20 SP GP (Propane Gas)

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)
04Fault in the flame relay (flame relay stuck/not working).The flame relay is integrated into the control board; if it sticks or does not switch, the PCB generates the 04. Check with ignition demand if the relay switches on the board (audible/measurement) and if not, replace the board.
05Fault in the safety circuit (boiler reset).The safety circuit is managed by the PCB; an internal fault prevents the reset and triggers 05. Check the external safety chain; if it is correct and the PCB does not close the circuit, the PCB is defective.
09Power failure in gas solenoid valve(s) / fault in the safety relay (energised).The output to the gas EV goes through the safety relay on the PCB; if that relay/output fails, no voltage is present and 09 appears. Check 230 VAC between common and outputs to EV on the PCB during demand; if there is no voltage with pressure switches OK, PCB is faulty.
12Ignition lockout (lack of gas or spark).In NR-15/20 the ignition transformer is integrated/controlled by the PCB; if the PCB does not deliver a spark to the electrodes, 12 is triggered. Check for the presence of high voltage at ignition; if there is no spark and correct power supply, replace the PCB.
16Safety fuse open during operation.The supervision of the safety fuse is carried out by the PCB; an electronic fault can interpret/produce an opening and generate 16. Check the physical fuse; if it is correct and 16 persists, fault in the PCB circuit (replace).
How do I know if this PCB is for my boiler?
Verify the reference 122121490 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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