SIT 845 Sigma Gas Valve for Fagor FE20E
It regulates and allows gas to flow to the burner under the control board's command. If it fails, you will notice that the boiler does not ignite; there may be flame lockouts or modulation issues. This SIT 845 Sigma gas valve is compatible with Fagor boilers such as the FE20E, among others like the FE-24E and FA-20E2N. It is advisable to replace it when errors such as F1, F6, or F10 occur, which indicate ignition or gas valve control problems.
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, it doesn't even make the long spark attempt.
Cause: The gas valve is not allowing gas to pass, and the control board does not detect a flame.
Confirm the code of your gas valve before ordering it.
- 02
Gas is not reaching the burner even though the electrode is sparking normally.
Cause: The main solenoid valve does not receive the open command or it gets stuck.
Check that the gas shut-off valve is fully open and that there has been no interruption in the supply.
- 03
The boiler locks out with a gas valve fault warning.
Cause: The control unit cuts off the supply because the valve does not confirm opening within the safety time.
Perform a reset and check if the fault occurs consistently on the same attempt before replacing the gas valve.
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
- 5 units
- 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.
- Valve model
- 845 Sigma
- Manufacturer
- SIT
- Place of manufacture
- Made in Italy (Padua)
- Gas
- ALLGAS (multi-gas)
Frequently asked questions about the gas valve MU0809100
Which manufacturer has the SIT 845 Sigma gas valve used in the Fagor FE20E?
Is this SIT 845 Sigma valve compatible with natural gas and LPG in the Fagor FE20E?
For which Fagor boiler model is this SIT 845 Sigma gas valve intended?
Spare parts related to Fagor Eco Compact FE-20E
