What does fault code 15 mean on Saunier Duval?

Stepper motor fault (gas valve) The stepper motor of the gas block does not open/modulate the valve: no gas reaches the burner and the electronics lock. Check 24 Vdc→12 Vdc supply to the valve and coil resistance (~116 Ω) and observe shutter movement on demand.

What does fault code 16 mean on Saunier Duval?

Gas safety valve fault Gas block safety solenoid valve fault: does not open/close correctly and the control detects a defect. Check for the presence of 24 Vdc on ignition, continuity/resistance of the coil, and gas block tightness.

RefurbishedSaunier Duval Gas valves

Saunier Duval Thema NOx F 24 Gas Valve Ref. 2000803071

Name: Saunier Duval Thema NOX F 24 Gas Valve Ref. 2000803071
Brand: Saunier Duval
SKU: VGTNOXF24
Price: 30 EUR
Availability: InStock

30 €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 2000803071. 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

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Key Data

Reference: 2000803071
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)
15	Stepper motor fault (gas valve)	The stepper motor of the gas block does not open/modulate the valve: no gas reaches the burner and the electronics lock. Check the 24 Vdc→12 Vdc supply to the valve and the coil resistance (~116 Ω) and observe the movement of the shutter on demand.
16	Gas safety valve fault	Fault in the safety solenoid valve of the gas block: it does not open/close correctly and the control detects a defect. Check for the presence of 24 Vdc during ignition, continuity/resistance of the coil, and the tightness of the gas block.