Bithermal Heat Exchanger Ariston Microtec T2 LLS 23 MFFI Ref. 998619
Refurbished Ariston Bithermic heat exchanger

Bithermal Heat Exchanger Ariston Microtec T2 LLS 23 MFFI Ref. 998619

The Ariston Microtec T2 LLS 23 MFFI dual heat exchanger is a component that allows simultaneous heating of the heating circuit and domestic hot water. When it fails, you may notice that the water comes out lukewarm, there are temperature fluctuations, or there is a mixing of circuits. This heat exchanger is compatible with several boiler models, such as the 23 MCSI, 23 MI, and others from the Microtec range, among others. A technician must confirm through diagnosis whether it needs to be replaced when there are heating issues or internal leaks.

Type of part
Bithermic heat exchanger
Status
Refurbished
Catalogue reference
998619
Warranty
1 year
VAT included Stock · 3 units
Compatibility

Ariston boilers compatible with reference 998619

Bithermal heat exchanger with reference 998619. 17 confirmed compatibilities: 23 MCSI and 23 MI.

Verified compatibility

Boiler modelFamilyVerification
Ariston 23 MCSIESTVerified
Ariston 23 MIESTVerified
Ariston GENUS 23 MFFIMVerified
Ariston 23 MFFIMICROTECVerified
Ariston 23 MIMICROTECVerified
Ariston 23 MFFIMODULAVerified
Ariston 23 MIMODULAVerified
Ariston R2 23 MINEWVerified
Ariston 23 MFFINEXTVerified
Ariston 23 MINEXTVerified
Ariston 23 MCSIONEVerified
Ariston 23 MIONEVerified
Ariston MFFIT2/23Verified
Ariston MIT2/23Verified
Ariston PLUS 23 MITHISAVerified
Ariston 23 MFFITXVerified
Ariston 23 MITXVerified

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

Guide

How to check if the part number 998619 is the correct one for your boiler.

The part reference, model, and equipment revision must be verified against the manufacturer's documentation.

  1. Find the reference printed on the installed part and check whether it matches the catalogue reference 998619. If it is not visible, do not identify the part from 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 that require diagnosis in the bivalent heat exchanger 998619

The bivalent heat exchanger transfers heat to heating and domestic hot water. These are the typical symptoms and what to do:

Common symptoms and faults

  • 01

    No hot water comes out or only lukewarm water comes out when the tap is opened.

    Cause: The double heat exchanger is not heating the water properly because it is scaled and does not transfer enough heat.

    Check the cold water inlet filter and the flow rate before replacing the heat exchanger, as a dirty filter can cause the same issue.

  • 02

    Water or moisture is observed in the area of the heat exchanger inside the boiler.

    Cause: Over time, the gaskets or the body of the heat exchanger may develop small leaks due to scale.

    Dry the area and turn on the boiler in domestic hot water and heating mode separately to identify where the dripping is coming from.

  • 03

    The boiler heats less domestic hot water than before, less and less each time.

    Cause: The accumulation of scale in the domestic hot water circuit of the heat exchanger reduces its heat exchange capacity.

    Is the water in the area hard, and has the boiler ever been descaled? If not, limescale could be the main cause.

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 the Ariston 998619 double heat exchanger.

Catalogue reference
998619
Uniclima internal SKU
IBCT2LLS23
Brand
Ariston
Type of part
Bithermic heat exchanger
Units in stock
3 units
Status
Refurbished
Warranty
1 year
Shipping
Delivery time shown at checkout
Return
14 days
Documentation

Manuals and technical documentation

Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.

Frequently asked questions

Frequently asked questions about the bivalent heat exchanger 998619

Does this bivalent heat exchanger fit the Ariston Microtec T2/23 MI and also the MFFI?
Yes, the datasheet lists both the MFFI and MI versions of the T2/23 as compatible, in addition to other ranges such as EST, M Genus, Modula, Next, One, and Thisa Plus in 23.
What fault of the Ariston Next 23 or Modula 23 is resolved by replacing this heat exchanger?
Lack of hot water, water coming out lukewarm, or leaks in the heat exchanger.
Does this heat exchanger work for both heating and domestic hot water in the Ariston T2/23?
Yes, it is a bivalent body that heats domestic hot water and heating water in the same component.
Delivery calculated by destination Delivery time shown at checkout
1-year warranty inspected and tested
14-day return uninstalled parts
Technical support we verify your model
Bithermal Heat Exchanger Ariston Microtec T2 LLS 23 MFFI Ref. 998619