What does fault code A03 mean on Beretta?

Air pressure switch alarm (Model C.S.I.). The air pressure switch does not close/open its contact due to lack of vacuum or internal fault, blocking the ignition cycle. Check with a U-tube manometer and micro continuity while the fan generates vacuum; inspect silicone tubes and connection in the air box.

What does fault code A04 mean on Beretta?

H2O pressure switch alarm. The water pressure switch remains open due to insufficient pressure or a fault, preventing start-up. Check circuit pressure (≥1 bar approx.), bleed and check continuity of the pressure switch; if necessary, test temporary bridge for diagnostic purposes according to the manual.

What does fault code E35 mean on Beretta?

Differential water pressure switch error (contact open). The differential water pressure switch does not detect sufficient flow/differential pressure or is stuck open, causing the PCB to indicate a fault. Check the pressure differential and continuity of the pressure switch during circulation; inspect filters, pump, and possible obstructions.

RefurbishedBeretta Pressure switches

Beretta Pressure Switch TYP Ref. FS6000

Name: Beretta Pressure Switch TYP Ref. FS6000
Brand: Beretta
SKU: PCBFS6000
Price: 30 EUR
Availability: InStock

30 €VAT includedIn stock · 1 unit

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 FS6000. 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: FS6000
Brand: Beretta
Type of part: Pressure switches
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)
A03	Air pressure switch alarm (Model C.S.I.).	The air pressure switch does not close/open its contact due to lack of vacuum or internal fault, blocking the ignition cycle. Check with a U-tube manometer and micro continuity while the fan generates vacuum; inspect silicone tubes and connection in the air box.
A04	Water pressure switch alarm.	The water pressure switch remains open due to insufficient pressure or a fault, preventing the start-up. Check the circuit pressure (≥1 bar approx.), bleed and check the continuity of the pressure switch; if necessary, test a temporary bridge for diagnostic purposes according to the manual.
E35	Differential water pressure switch error (open contact).	The water differential pressure switch does not detect sufficient flow/differential pressure or is stuck open, causing the PCB to indicate a fault. Check the differential pressure and continuity of the pressure switch during circulation; inspect filters, pump, and possible blockages.