What does fault code 02 mean on Saunier Duval?

Name: Saunier Duval Isomax F 35 H Flue Pressure Switch MOD Ref. 0020048295
Brand: Saunier Duval
SKU: PCIF35HMOD
Price: 25 EUR
Availability: InStock

Airflow fault The flue pressure switch does not switch on start-up (does not detect the pressure differential) due to a faulty diaphragm/micro or blocked hoses/venturi; the PCB interprets a lack of draft and triggers the 02. Check continuity at its terminals with the fan running and inspect the pressure and flue exhaust tubes.

RefurbishedSaunier Duval Pressure switches

Saunier Duval Isomax F 35 H Flue Pressure Switch MOD Ref. 0020048295

25 €VAT includedIn stock · 4 units

Pressure switch: refurbished spare part that controls air or water pressure to authorize operation. Useful if the boiler does not start or shows a draft error. Reference 0020048295. Includes a one-year warranty and delivery within 2–4 working days in the EU.

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Key Data

Reference: 0020048295
Brand: Saunier Duval
Type of part: Pressure switches
Available units: 4 units 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)
02	Air flow fault	The flue pressure switch does not switch on start-up (does not detect the pressure differential) due to a faulty diaphragm/micro or blocked hoses/venturi; the PCB interprets a lack of draft and triggers the 02. Check continuity at its terminals with the fan running and inspect the pressure tubes and flue exhaust.