Air Pressure Switch Boiler Ariston Micro Genus 23 MFFI - Code 605.99509
If your boiler does not start or gets blocked despite the pressure being correct, the problem could be with the air pressure switch. This component, the Air Pressure Switch for Ariston Micro Genus 23 MFFI with reference 605.99509, is responsible for checking the air pressure and authorizing the operation of the boiler. When it fails, you may experience faults such as E33, which indicates that the pressure switch is closed before the ignition sequence, or E34, which signals that it does not close when the fan is operating. This pressure switch is compatible with the Micro Genus 23 MFFI boiler, among others. It is recommended to replace it if you notice these symptoms or related faults.
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Consult via WhatsAppAriston boilers compatible with reference 573989-01
Pressure switch with reference 573989-01. A proven compatibility: Micro Genus 23 MFFI.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Ariston Micro Genus 23 MFFI | Micro Genus | 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 ref. 573989-01 is the part 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 573989-01. 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 573989-01 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 up just as it starts, before the flame comes on.
Cause: The air pressure switch does not confirm the extractor pressure during the pre-purge; if it does not, the control board does not allow the gas to enter.
With the extractor running, check if the pressure switch makes an audible click or if there is continuity with a multimeter before replacing it.
- 02
The fault occurs every time the fan starts, at the beginning of the cycle.
Cause: It is the moment when the pressure switch should close the contact; a fault here indicates a problem with the pressure switch or the air duct.
Check that the silicone tube between the pressure switch and the fan is properly connected and free of cracks.
- 03
The display shows a fault with the fan or extractor, although it sounds normal.
Cause: The control unit interprets the lack of signal from the pressure switch as a ventilation fault, even though the extractor is functioning correctly.
Clean the flue terminal and the air filter if it has one; an air restriction can also prevent reaching the necessary pressure.
- 04
The ignition fails intermittently, without a clear pattern.
Cause: A pressure switch with a worn diaphragm may switch on and off intermittently in response to small pressure variations.
Note if the fault occurs when cold or with the boiler just turned off; this helps to differentiate whether the problem is with the pressure switch or the flue.
Fault codes for Ariston that this part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| E33 | The air pressure switch is closed before the ignition sequence. | The air pressure switch 573989-01 can become 'stuck' or give a false signal due to inverted/blocked tubes; verify that with the fan stopped, the switch is open and that the signal changes correctly by checking continuity and pipes. |
| E34 | The air pressure switch does not close when the fan is operating. | Diaphragm of the pressure switch 573989-01 fatigued or lack of depression in the flue circuit; check with a differential manometer that the threshold indicated in the manual (~0.55 mbar at maximum power) is reached and that the pressure switch activates when the fan starts. |
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.
Datasheet for Ariston Pressure Switch 573989-01
- Catalogue reference
- 573989-01
- Brand
- Ariston
- Type of part
- Pressure switches
- Units in stock
- 5 units
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- 1-2 business days
- 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.
- Pressure differential
- 40 Pa / Δ+12 Pa
- Component code
- 605.99509
- Regulation range / contact
- 0.2(0.1)/30~
- Batch code
- MAKBBC
- Serial number
- MTS 2399551018000
Frequently asked questions about the pressure switch 573989-01
Is this pressure switch 605.99509 compatible with other models besides the Ariston Micro Genus 23 MFFI?
At what pressure should this pressure switch activate for the Micro Genus 23 MFFI to ignite?
What code should I look for on my part to confirm that it is this one?
What is the function of this pressure switch in the Ariston Micro Genus 23 MFFI?
How many models are compatible with the pressure switch 605.99509?
What is the reference for this pressure switch?
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