Saunier Duval Isomax Air Pressure Switch F 28 E2 Ref. S57440
RefurbishedSaunier DuvalPressure switches

Saunier Duval Isomax Air Pressure Switch F 28 E2 Ref. S57440

25 €VAT includedIn stock · 5 units

Pressure switch: reconditioned 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 Isofast F 28 E, Isofast F 28 E1, Isomax F 28 E (ref. S57440). 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
S57440
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. S57440) equips these models. Verified compatibility; check the reference before purchasing.

Isofast

  • Isofast F 28 E
  • Isofast F 28 E1

Isomax

  • Isomax F 28 E
  • Isomax F 28 E2

Isotwin

  • Isotwin F 24 E

Opalia

  • Opalia F 11 E
  • Opalia F 14 E

Opaliatherm

  • Opaliatherm TF 11
  • Opaliatherm TF 14

Themafast

  • Themafast F 24 E

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)
02Airflow fault.The air pressure switch S57440 does not switch correctly (open when the fan starts or stuck/open circuit), so the PCB does not 'test' the draft; check continuity at its terminals during the ignition sequence, condition of the intake tubes (obstructions/leaks), and wiring/terminals.
How do I know if this pressure switch is for my boiler?
Verify the reference S57440 printed and ensure your model is on the list of compatible ones; also compare the connections with the original part. It is a Huba 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 Isomax F 28 E2

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