
Microgenus 23 MFFI Boiler Plate Heat Exchanger Ref. 571646
The plate heat exchanger of the Microgenus 23 MFFI boiler, Ref. 571646, from Ariston, is responsible for transferring heat from the primary circuit to the domestic hot water instantly. When it fails, the user notices that the water comes out lukewarm or with fluctuating temperature, in addition to experiencing a decrease in the flow of hot water. This component is compatible with the Genus 23 MFFI and Microgenus 23 MFFI models, among others. It is recommended to replace it when these malfunction symptoms occur.
VAT included
Consult via WhatsAppAriston boilers compatible with reference 571646
Plate heat exchanger with reference 571646. Two confirmed compatibilities: Genus 23 MFFI and Microgenus 23 MFFI.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Ariston Genus 23 MFFI | Genus 23 MFFI | Contrasted |
| Ariston Microgenus 23 MFFI | Microgenus 23 MFFI | 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. 571646 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 571646. 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 plate heat exchanger 571646 resolves.
The plate heat exchanger transfers heat to the domestic hot water. These are the typical symptoms and what to do:
Common symptoms and faults
- 01
The hot water comes out lukewarm or the temperature fluctuates even though the tap is set.
Cause: The heat exchanger plates are clogged with scale, and heat is not being transferred consistently.
Reduce the flow of the tap and see if the temperature stabilizes; if it improves with less water, the heat exchanger is the cause.
- 02
The boiler takes a few extra seconds to provide hot water every time you turn on the tap.
Cause: With accumulated heat, the heat exchanger takes longer to heat the water that passes through the plates.
Time the delay and compare it with what you remember from before; an increasing delay indicates progressive embedding.
- 03
There is moisture or a fine drip at the bottom of the boiler.
Cause: The joints between the plates lose tightness with daily use.
Dry the area well and turn on the boiler for domestic hot water; if the dripping appears, it points to the heat exchanger.
- 04
The pressure in the system decreases over the days without any visible leak.
Cause: An internal micro-leak in the heat exchanger allows water to pass between circuits without being noticeable from the outside.
Fill up to the working pressure and check the pressure gauge a couple of days later without using the boiler.
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 Ariston plate heat exchanger 571646
- Catalogue reference
- 571646
- Brand
- Ariston
- Type of part
- Plate heat exchanger
- Units in stock
- 4 units
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- 1-2 business days
- Return
- 14 days












