Fagor Gas Valve FE20E1N SIT 845 SIGMA Ref. MU0809100
SIT 845 SIGMA gas valve for Fagor FE20E1N boilers. It controls the gas flow to the burner through two solenoid valves (EV1 and EV2) and allows up to 60 mbar of inlet pressure. It is replaced when the boiler does not ignite, cuts off the gas supply, or the burner fails to start.
VAT included
Consult via WhatsAppFagor boilers compatible with reference MU0809100
Gas valve with reference MU0809100. 12 verified compatibilities: FE-20E/2N and FE-20E/2B.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Fagor FE-20E/2N | Fagor Eco Compact FE-20E | Contrasted |
| Fagor FE-20E/2B | Fagor Eco Compact FE-20E | Contrasted |
| Fagor FE-20E | Fagor Eco Compact FE-20E | Contrasted |
| Fagor FE-24E | Fagor FE (rest of series) | Contrasted |
| Fagor FE-27E | Fagor FE (rest of series) | Contrasted |
| Fagor FE-24NOX | Fagor FE (rest of series) | Contrasted |
| Fagor FA-20E2N | Fagor FA | Contrasted |
| Fagor FA-23EN | Fagor FA | Contrasted |
| Fagor FEB-20E | Fagor FEB | Contrasted |
| Fagor FEE-20 | Fagor FEE | Contrasted |
| Fagor CA-20EN | Fagor CA | Contrasted |
| Fagor CE-20E | Fagor CE | 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. MU0809100 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 MU0809100. 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 gas valve MU0809100 resolves.
The gas valve regulates and modulates the gas flow to the burner. These are the typical symptoms and what to do:
Common symptoms and faults
- 01
The boiler does not ignite and there is no flame in the burner.
Cause: One of the solenoid valves of the gas valve does not open the gas flow.
Check the power supply to the gas valve and make sure that the gas shut-off valve is fully open before replacing it.
- 02
The flame ignites for a moment and then goes out immediately.
Cause: The gas valve does not maintain the gas flow for the necessary time to stabilize the flame.
Rule out that the ionization electrode is dirty or misaligned before replacing the gas valve.
- 03
The boiler locks out due to lack of gas on startup.
Cause: The inlet pressure does not reach the minimum required for the gas valve to open correctly.
Measure the gas inlet pressure with a manometer before declaring the valve faulty.
- 04
A knocking or vibrating noise is heard when turning it on.
Cause: Abrupt or irregular opening of the internal solenoid valves.
Check that the mains pressure is neither excessive nor insufficient before replacing the part.
Fault codes for Fagor that this part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| F1 | Lockout due to ignition fault (flame not established). | The faulty/stuck gas valve may not open or modulate at startup, and insufficient gas may reach for ionization; check voltage in coils during the ignition attempt and pressure/flow in the ramp, ensuring the valve opens. |
| F6 | Flame detection with the burner at rest (parasitic flame). | If the gas valve does not close hermetically, it allows gas to pass and a residual flame persists; check the valve's closure/sealing when stopped and rule out a false ionization signal. |
| F10 | Fault in the control or closure of the gas valve. | Fault in the valve or its control circuit (coils/relays) prevents proper opening/closing; check coil continuity, control voltage from the PCB, and ensure the flame extinguishes when closure is commanded. |
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 gas valve Fagor MU0809100
- Catalogue reference
- MU0809100
- Brand
- Fagor
- Type of part
- Gas 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.
- Family/model
- 845 SIGMA
- SIT code
- 0845061
- Inlet pressure (Pi max)
- 60 mbar
- Outlet pressure (Po)
- 1-37 mbar
- EV1
- 220V~50Hz, 9.2 VA class B
- EV2
- 220V~50Hz, 2.8 VA class J
- MD max
- 17V DC
- Maximum current
- 165 mA
- Ambient temperature
- 0/60°C
- Place of manufacture
- Made in Italy (Padua)
Frequently asked questions about the gas valve MU0809100
Is this SIT 845 SIGMA valve the one installed in the Fagor FE20E1N?
Which manufacturer has this gas valve for the Fagor FE20E1N?
What inlet pressure does the valve of the Fagor FE20E1N accept?
What outlet pressure does this SIT valve provide in the Fagor FE20E1N?
What is the consumption of the solenoid valves EV1 and EV2 of this valve?
Why is this valve replaced in the Fagor FE20E1N?
Spare parts related to Fagor Eco Compact FE-20E
