Primary Heat Exchanger Ariston Microgenus 23 MFFI Ref. 998620
RefurbishedAristonPlate heat exchanger

Primary Heat Exchanger Ariston Microgenus 23 MFFI Ref. 998620

Stock · 7 units

In Ariston Microgenus boilers, the Ariston Microgenus 23 MFFI primary heat exchanger is an essential component that transfers heat from the primary circuit to the domestic hot water instantly. When it fails, you will notice that the water comes out lukewarm or with fluctuating temperature, and the flow of DHW decreases. This heat exchanger is compatible with the Microgenus range, including the 23 MFFI model. It is recommended to replace it when these symptoms occur to restore the proper supply of hot water.

VAT included

Compatibility

Ariston boilers compatible with reference 998620

Plate heat exchanger with reference 998620. A proven compatibility: Microgenus 23 MFFI.

Proven compatibility

Boiler modelFamilyVerification
Ariston Microgenus 23 MFFIAriston MicrogenusContrasted

Can't see your model or have questions? The printed reference takes precedence. How to check it ·

Guide

How to check if ref. 998620 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.

  1. Find the reference printed on the installed part and check whether it matches the catalogue reference 998620. If it is not visible, do not identify the part by its shape alone.
  2. Check the full boiler model on its data plate and look for it in the model associations on this page.
  3. Compare the connections and physical body with the original part before installation.
  4. If anything is unclear, send us a photo of the marking via WhatsApp before placing your order.
Diagnosis and fault codes

Symptoms and faults that the plate heat exchanger 998620 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 in irregular spurts, sometimes hot and other times cold, even with the tap always open the same way.

    Cause: Limescale partially obstructs the internal passages of the heat exchanger, causing the water flow to become irregular.

    Test the tap with both low and high flow rates and note if the fault changes; this helps to distinguish a limescale problem from another cause.

  • 02

    The boiler is taking longer and longer to provide hot water, and a few months ago this wasn't happening.

    Cause: The limescale buildup gradually blocks the internal passage of the heat exchanger.

    Compare the current waiting time with the previous one and check the water hardness in the area before deciding on the change.

  • 03

    The heating circuit loses pressure without any visible leaks in the installation.

    Cause: An internal perforation in the heat exchanger connects the heating circuit with the domestic water circuit.

    Check if you need to refill the heating pressure more frequently than usual before considering this cause as valid.

  • 04

    The heating works normally, but the domestic hot water is always cold or almost cold.

    Cause: A severely clogged heat exchanger prevents the combustion heat from reaching the domestic water circuit.

    Check that the boiler is set to the correct function for domestic hot water and rule out a fault in the three-way valve before replacing the heat exchanger.

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.

Technical data

Data sheet for Ariston plate heat exchanger 998620

Catalogue reference
998620
Brand
Ariston
Type of part
Plate heat exchanger
Units in stock
7 units
Status
Refurbished
Warranty
1 year
Shipping
Delivery time shown at checkout
Return
14 days
Frequently Asked Questions

Frequently asked questions about the plate heat exchanger 998620

Is this heat exchanger for the Microgenus 23 MFFI a plate or coil type?
It is a finned coil heat exchanger, with copper tubing and fins; the observed appearance does not match a plate heat exchanger.
Is this heat exchanger compatible with other Ariston models?
Compatibility is confirmed only with the Microgenus 23 MFFI model.
What is the purpose of the primary heat exchanger Ariston Microgenus 23 MFFI?
Transfers the heat from combustion to the water in the boiler.
What is the reference for this heat exchanger?
The reference for the primary heat exchanger is ITBMG23MFFI.
Are there documented fault codes for this heat exchanger?
No, there are no documented fault codes for this product.

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Primary Heat Exchanger Ariston Microgenus 23 MFFI Ref. 998620