What does fault code F1 mean on Saunier Duval?

Ignition fault: the burner fails to establish a flame. If the stepper motor of the gas valve (S1071700) gets stuck or does not position at minimum opening, the valve does not open/opens insufficiently and there is no gas in the burner. Check by measuring 24 Vdc at the valve connector and verifying the pressure at the test point with a manometer; test the valve/motor according to the manual.

What does fault code F4 mean on Saunier Duval?

Ignition fault/flame not detected or extinguishes after starting. A stepper motor of the gas valve that does not open or modulate correctly causes insufficient flow/pressure and the flame does not establish or extinguishes. Verify by opening the valve and measuring pressure at the valve port with a manometer; if there is 24 Vdc command but no gas, check adjustment/blockage and replace the motor S1071700.

RefurbishedSaunier Duval Gas valves

Stepper Motor for Gas Valve G20 Saunier Duval S1071700 ThemaClassic F24E F30E F35E Isofast Isomax Combitek

Name: Stepper Motor for Gas Valve G20 Saunier Duval S1071700 ThemaClassic F24E F30E F35E Isofast Isomax Combitek
Brand: Saunier Duval
SKU: MVGTF24E
Price: 25 EUR
Availability: InStock

Ref. 20146481, S1071700, 1155755

25 €VAT includedIn stock · 1 unit

Gas valve: refurbished spare part that regulates and modulates the gas flow to the burner. Useful if there are ignition faults or the flame does not modulate. Reference 20146481, S1071700, 1155755. 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: 20146481, S1071700, 1155755
Brand: Saunier Duval
Type of part: Gas valves
Available units: 1 unit in stock
Status: Refurbished
Warranty: 1 year
Shipping: 2–4 working days (EU)
Return: 14 days

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.

Code	What does it mean?	Cause and diagnosis (this part)
F1	Ignition fault: the burner fails to establish a flame.	If the stepper motor of the gas valve (S1071700) gets stuck or does not position at minimum opening, the valve does not open/opens insufficiently and there is no gas in the burner. Check by measuring 24 Vdc at the valve connector and verifying the pressure at the test point with a manometer; test the valve/motor according to the manual.
F4	Ignition fault/flame not detected or extinguishes after starting.	A stepper motor of the gas valve that does not open or modulate correctly causes insufficient flow/pressure and the flame does not establish or extinguishes. Verify by opening the valve and measuring pressure at the valve port with a manometer; if there is 24 Vdc control but no gas, check for adjustment/blockage and replace the motor S1071700.