Saunier Duval Isofast 21 Condens Interface Circuit F30 B 1 Ref. 0020105958
RefurbishedSaunier DuvalPCBs (control boards)

Saunier Duval Isofast 21 Condens Interface Circuit F30 B 1 Ref. 0020105958

40 €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 (ref. 0020105958). 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
0020105958
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. 0020105958) equips these models. Verified compatibility; check the reference before purchasing.

Isofast 21 Condens

  • Isofast 21 Condens

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.70Invalid boiler identification.It usually appears when the screen/interface and the main PCB are replaced simultaneously and the appliance's code/variant is not reconfigured; the interface remains 'unrecognized'. Verify by entering technical mode to adjust the product code and, if it persists, try with another screen/interface or check the resistance/power coding.
withThere is no communication with the PCB (screen ↔ electronics communication).The interface/display board loses the data bus connection with the main PCB (fault of the interface itself or its connection/power supply). Check voltages and connectors between the display and the PCB, continuity of the harness, and, if applicable, temporarily replace the interface to rule out the fault.
How do I know if this PCB is for my boiler?
Verify the reference 0020105958 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.

Spare Parts Related Boiler Isofast 21 Condens F30 B 1

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