SIT Sigma Gas Valve for Fagor Boiler FE20E and FE27EMA - Code 0063AS4831
It regulates and allows gas to flow to the burner under the control of the PCB, being this component from SIT, with reference 0063AS4831. When it fails, the boiler may not ignite, present flame lockouts, or have modulation issues. The associated fault codes are F1, F6, and F10. This gas valve is compatible with Fagor boilers such as the FE20E and FE27EMA, among others. It should be replaced when the mentioned symptoms are detected or in case of any ignition or gas control failure.
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, the burner does not light up.
Cause: The gas valve does not open the gas flow even though the control board commands the ignition.
Before replacing it, check that the gas valve is open and that the ignition electrode produces a spark.
- 02
The burner turns off by itself shortly after being ignited.
Cause: The valve loses a tight seal or cuts off the supply prematurely, and the flame goes out.
Check the incoming gas pressure with a manometer to rule out that the problem comes from the supply line and not from the gas valve.
- 03
The ignitions are unstable: sometimes it lights on the first try and other times it does not.
Cause: The internal mechanism of the gas valve is failing intermittently, a typical symptom of a worn component.
Note if the fault occurs only when cold or also when hot: this helps to distinguish the valve from other ignition elements.
- 04
A gas smell is detected near the gas valve.
Cause: There may be a leak due to deterioration of the internal or external seals of the gas valve.
Apply soapy water to the connections before replacing the part to rule out that the leak is in a fitting.
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
- 4 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.
- Manufacturer
- SIT
- Code printed on the label
- 0063AS4831
- Place of manufacture
- Made in Italy (Padua)
Frequently asked questions about the gas valve MU0809100
Is this SIT Sigma valve suitable for a Fagor FE27EMA?
Who manufactures this valve for the Fagor FE20E?
What code is printed on this SIT Sigma valve of the Fagor FE20E?
Spare parts related to Fagor Eco Compact FE-20E
