Main PCB Saunier Duval Isofast 21 Condens F30 B 1 Ref. 0020066125
RefurbishedSaunier DuvalPCBs (control boards)

Main PCB Saunier Duval Isofast 21 Condens F30 B 1 Ref. 0020066125

80 €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 is unresponsive. Compatible with Isofast 21 Condens F30 B/1, Isofast 21 Condens F35 (ref. 0020066125). Includes a one-year warranty and delivery within 2–4 working days in the EU.

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

Key Data

Reference
0020066125
Brand
Saunier Duval
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. 0020066125) equips these models. Verified compatibility; check the reference before purchasing.

Isofast 21 Condens

  • Isofast 21 Condens F30 B/1
  • Isofast 21 Condens F35

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.63EEPROM faultThe EEPROM of the main PCB is corrupted/unreadable; if sensors and wiring are OK, the fault is with the PCB. Check power supply and connectors; if the issue persists, replace the PCB.
F.64Electronic fault / NTCMeasurement circuit fault in the PCB (ADC/NTC reading). With NTC and harness correct, check grounds/signals on the board; if the error persists, replace the PCB.
F.65Fault: PCB temperatureThe electronics of the PCB exceed its internal safety temperature or the internal sensor of the PCB fails. Check external causes (heat, ventilation) and, if the reading is incorrect or the fault persists, replace the PCB.
F.67Fault: electronics/flameDefective flame signal processing in the PCB. If the ionisation electrode/cable and ventilation are fine and the "signal not plausible" persists, the cause is the control board; check grounds/signals and replace it if necessary.
How do I know if this PCB is for my boiler?
Verify the reference 0020066125 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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