Ariston Microgenus 27 MFFI Air Pressure Switch Honeywell 571651 01
RefurbishedAristonPressure switches

Ariston Microgenus 27 MFFI Air Pressure Switch Honeywell 571651 01

Ref. 571651-01

25 €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. Compatible with CODEX27, GENUS30MFFI, F23MFFI (ref. 571651-01). 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
571651-01
Brand
Ariston
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

The same part (ref. 571651-01) equips these models. Verified compatibility; check the reference before purchasing.

Codex

  • CODEX27

Genus

  • GENUS30MFFI

F (MFFI)

  • F23MFFI

Beautiful

  • LINDA23

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)
E33The air pressure switch (flue pressure switch) is closed before the ignition sequence.The Honeywell pressure switch 571651-01 can become 'stuck' (contacts closed without depression) or receive false pressure due to obstruction/tubes; the PCB detects premature closure. Check the micro continuity and that it opens/closes by applying depression and inspecting tubes/venturi.
E34The air pressure switch (flue pressure switch) does not close when the fan runs.If the 571651-01 does not switch (rigid diaphragm, faulty micro) or no pressure reaches the pressure switch, the boiler does not receive flue authorization. Check with a differential manometer and micro continuity with the fan running; inspect tubes/venturi/fan.
How do I know if this pressure switch is for my boiler?
Check the reference 571651-01 printed and ensure your model is on the list of compatible ones; also compare the connections with the original part. It is a Honeywell piece.
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.

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