Ariston Microgenus 23 MFFI Air Pressure Switch Ref. 571651
If your boiler does not start or gets blocked despite the pressure seeming correct, you may need the Ariston Microgenus 23 MFFI air pressure switch. This part is responsible for monitoring the air pressure and authorizing the operation of the boiler. When it fails, it is common for fault codes such as E33, E34, or 6P2 to appear. It is compatible with models from the Microgenus, Genus, Linda, and Codex ranges, among others. It should be replaced when experiencing these symptoms or if the boiler has ignition problems.
VAT included
Consult via WhatsAppAriston boilers compatible with reference 571651
Pressure switch with reference 571651. Four confirmed compatibilities: F23MFFI and GENUS30MFFI.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Ariston F23MFFI | Microgenus | Contrasted |
| Ariston GENUS30MFFI | Genus | Contrasted |
| Ariston LINDA23 | Beautiful | Contrasted |
| Ariston CODEX27 | Codex | Contrasted |
Can't see your model or have questions? The printed reference takes precedence. How to check it · Send us a photo via WhatsApp.
How to check if the part number 571651 is the one for your boiler
What determines it is not the boiler model, but the reference printed on the part you already have installed.
- Find the reference printed on the installed part and check whether it matches the catalogue reference 571651. If it is not visible, do not identify the part from its shape alone.
- Check the full boiler model on its data plate and look for it in the model associations on this page.
- Compare the connections and physical body with the original part before installation.
- If anything is unclear, send us a photo of the marking via WhatsApp before placing your order.
Symptoms and faults that the pressure switch 571651 resolves.
The pressure switch controls the air or water pressure to authorize operation. These are the typical symptoms and what to do:
Common symptoms and faults
- 01
The boiler locks out when trying to ignite, although the fan is working.
Cause: The pressure switch micro switch does not activate, even though the pressure is correct, usually due to internal wear.
Make sure that the two side pipe connections have good airflow, without bends or cracks.
- 02
The burner does not ignite, although the flue fan operates normally.
Cause: Without a signal from the pressure switch, the control board does not allow the gas valve to open, even if everything else is correct.
Visually check the condition of the two tubes that connect the pressure switch to the air circuit before replacing it.
- 03
The boiler tries to ignite briefly, the flame goes out immediately, and it locks out.
Cause: An unstable micro switch can send a momentary signal that is lost halfway through the cycle.
Listen for a clear click from the microswitch when starting the extractor; if you don't hear a click, it could be the part.
- 04
The fault mainly occurs after cleaning or handling the area of the extractor and the pipes.
Cause: It is easy to accidentally displace or pinch the side tubes of the pressure switch when working near the fan.
Make sure that the pipes are properly fitted into their connections after any work in that area.
Fault codes for Ariston that this part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| E33 | Air pressure switch (flue pressure switch) closed before the ignition sequence. | The pressure switch remains stuck/closed or there is a false differential due to blocked hoses/Venturi, indicating draft when the fan is not yet operating. Check with a differential manometer at test points and continuity of the pressure switch with the fan stopped. |
| E34 | The air pressure switch does not close when the fan operates. | The pressure switch does not switch due to lack of ∆P (draught/fan) or defective diaphragm/contact. Check ∆P at chamber connections and ensure the pressure switch closes with the fan running; inspect hoses/Venturi and, if necessary, replace the pressure switch. |
| 608 | Lack of flue pressure switch authorization with the fan running. | The pressure switch does not close despite the fan being active (insufficient ∆P or faulty pressure switch). Check by measuring ∆P and continuity of the pressure switch during the fan's operation; inspect silicone tubes and venturi. |
| 6P1 | Delay in the authorization of the flue/air pressure switch. | Slow/intermittent switching of the pressure switch (contact or membrane fatigued) or ∆P that takes time to be reached. Graphically verify ∆P with a manometer and the pressure switch closing times from fan start-up. |
| 6P2 | Air pressure switch opening during normal operation. | The pressure switch opens intermittently due to an internal fault or momentary loss of ∆P (blocked hoses/venturi). Check the continuity of the pressure switch and stable ∆P with the fan at speed; inspect and clean inlets and tubes. |
These symptoms can have more than one cause. If your boiler displays a fault code, send it to us via WhatsApp along with a photo of the labeling, and we'll tell you if this is the part.
Data sheet for the Ariston pressure switch 571651
- Catalogue reference
- 571651
- Brand
- Ariston
- Type of part
- Pressure switches
- Units in stock
- 3 units
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- Delivery time shown at checkout
- Return
- 14 days
Data read on the part and in the manufacturer's documentation
What we have not been able to verify does not appear here.
- Micro switch terminals
- NC, NO and C (body labeled as MICRO)
Frequently asked questions about the pressure switch 571651
Does this pressure switch work for a CODEX 27 boiler?
What fault of the A23 MFFI does this pressure switch resolve?
Spare parts related to Ariston Microgenus
