Air Pressure Switch Saunier Duval Hermann Thema NOx F24 Ref. 49003733
RefurbishedSaunier DuvalPressure switches

Air Pressure Switch Saunier Duval Hermann Thema NOx F24 Ref. 49003733

30 €VAT includedIn stock · 5 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. Compatible with Thema NOX F24, Supermicra Ecoplus 24, Supermicra Ecoplus 24 SE (ref. 49003733). 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
49003733
Brand
Saunier Duval
Type of part
Pressure switches
Available units
5 units in stock
Status
Refurbished
Warranty
1 year
Shipping
2–4 working days (EU)
Return
14 days

The same part (ref. 49003733) equips these models. Verified compatibility; check the reference before purchasing.

Thema NOx F24 / Supermicra Ecoplus 24

  • Thema NOx F24
  • Supermicra Ecoplus 24
  • Supermicra Ecoplus 24 SE

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)
F2Safety Flue Test (SFT) or pressure switch / air flow fault.The air pressure switch does not switch because it does not detect depression during pre-ventilation or is faulty; check continuity at terminals during fan start-up and inspect/clean hoses and venturi of the pressure switch.
F33Air flow fault.The air pressure switch does not switch (St33) due to not reaching the expected depression or due to an internal fault; check the switching with a multimeter and the differential pressure with a manometer/U-tube, as well as clean the tubes and venturi and verify the extractor.
How do I know if this pressure switch is for my boiler?
Verify the reference 49003733 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 pressure switch controls the pressure/draught (of air in sealed systems) or water to authorize operation.
Is the boiler not starting or showing a draught fault?
If the fan spins but does not ignite, check the pressure tubes (loose/blocked), the diaphragm, and the fan.
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
Check the tightness of the pressure pipes and the switching of the contact.
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 Hermann Thema NOx F24

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