Primary Heat Exchanger Ariston Microgenus 23 MFFI Ref. 998620
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 model 23 MFFI. A technician must confirm through diagnosis whether it needs to be replaced when these symptoms occur to restore the proper supply of hot water.
- Type of part
- Primary heat exchangers
- Status
- Refurbished
- Catalogue reference
- 998620
- Warranty
- 1 year
Ariston boilers compatible with reference 998620
Primary heat exchangers with reference 998620. A proven compatibility: Microgenus 23 MFFI.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Ariston Microgenus 23 MFFI | Ariston Microgenus | 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. 998620 is the part for your boiler
The part reference, model, and equipment revision must be verified against the manufacturer's documentation.
- 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.
- 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 that require diagnosis in primary heat exchangers 998620
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 sheet: Ariston 998620 heat exchangers
- Catalogue reference
- 998620
- Uniclima internal SKU
- ITBMG23MFFI
- Brand
- Ariston
- Type of part
- Primary heat exchangers
- Units in stock
- 7 units
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- Delivery time shown at checkout
- Return
- 14 days
Frequently asked questions: primary heat exchangers 998620
Is this heat exchanger for the Microgenus 23 MFFI a plate or coil type?
Is this heat exchanger compatible with other Ariston models?
What is the purpose of the primary heat exchanger Ariston Microgenus 23 MFFI?
What is the reference for this heat exchanger?
Are there documented fault codes for this heat exchanger?
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