Giannoni 3-Way Valve for Fagor Boiler FE-20E-2N
Three-way valve with Giannoni group, installed in Fagor mixed boilers from the FE/FEE range indicated. It directs the flow of water between heating and domestic hot water. Giannoni is the actual manufacturer of the component; Fagor is the brand of the boiler where it is installed. There is no reference code, setting, pressure, or voltage engraved on the part. It is replaced when it becomes stuck or loses tightness.
VAT included
Consult via WhatsAppFagor boilers compatible with reference MU1020100
Three-way valve with reference MU1020100. Four confirmed compatibilities: FE 20E/2N and FE 20E/2B.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Fagor FE 20E/2N | Fagor Eco Compact FE 20E / FEE 20 | Contrasted |
| Fagor FE 20E/2B | Fagor Eco Compact FE 20E / FEE 20 | Contrasted |
| Fagor FEE 20-2N | Fagor Eco Compact FE 20E / FEE 20 | Contrasted |
| Fagor FEE 20-2B | Fagor Eco Compact FE 20E / FEE 20 | 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 the part number MU1020100 is the one 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 MU1020100. 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 MU1020100 three-way valve resolves.
The 3-way valve diverts water between heating and domestic hot water. These are the typical symptoms and what to do:
Common symptoms and faults
- 01
The boiler does not heat domestic hot water but does heat, or vice versa.
Cause: The valve shutter gets stuck and does not allow the corresponding circuit to flow.
Look, if access allows, that the valve stem moves freely and is not stuck.
- 02
Sudden changes in water temperature when opening a tap
Cause: The valve does not completely close the heating flow when it should prioritize the domestic hot water.
Open and close the tap several times in a row and observe if the fault is constant or only appears intermittently; this helps determine if it is the gas valve or the sensor.
- 03
Water leaks from the body of the gas valve.
Cause: The Giannoni group loses tightness in the internal joints with years of use.
Check if the leak occurs only when the boiler is running or also when it is at rest, to narrow down whether it is the gas valve or the expansion vessel.
- 04
The valve gets stuck after a long period of not using the boiler.
Cause: The internal mechanism gets stuck due to lack of movement and the limescale in the water.
Try a forced start cycle in domestic hot water and heating before purchasing the part; sometimes it self-releases when moved.
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 the Fagor 3-way valve MU1020100
- Catalogue reference
- MU1020100
- Brand
- Fagor
- Type of part
- 3-way valves
- Units in stock
- 1 unit
- 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.
- Engraved manufacturer
- GIANNONI
- The component is Giannoni; it is not a part manufactured by Fagor, although it is installed in Fagor boilers.
Frequently asked questions about the 3-way valve MU1020100
Is this Giannoni 3-way valve suitable for my Fagor FE-20EF-2N?
Who actually manufactures this gas valve, Fagor or Giannoni?
What fault indicates that this gas valve needs to be replaced in a Fagor FE-28E?
Does this valve also work for the Fagor FE-20EIN-2N?
Spare parts related to Fagor Fagor Eco Compact FE 20E / FEE 20
