Fagor Gas Valve FE/FEE/FA/CE SIT 845 Sigma Ref. 0063AS4831
The gas valve Fagor FE/FEE/FA/CE SIT 845 Sigma Ref. 0063AS4831 regulates the flow of gas to the burner according to the commands from the boiler's PCB. When it fails, you may notice that the boiler does not ignite, experience flame lockouts, or detect a malfunction in gas modulation. This valve is compatible with various models such as FE-20E, FE-24E, FA-20E2N, and CE-20E, among others. A technician must confirm through diagnosis whether it needs to be replaced when fault codes F1, F6, or F10 appear, indicating issues with ignition or valve control.
- Type of part
- Gas valves
- Status
- Refurbished
- Catalogue reference
- MU0809100
- Warranty
- 1 year
Fagor 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
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 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 that require diagnosis in the gas valve MU0809100
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 or turns off by itself as soon as it starts.
Cause: The SIT 845 gas valve does not open the gas flow and the flame does not form.
Check that the network pressure regulator is functioning correctly and that the gas valve is fully open.
- 02
It smells like gas near the boiler even when it is off.
Cause: A gasket or the gas valve shutter may be leaking gas.
Close the gas valve and ventilate; do not reset the boiler until a technician checks the leak.
- 03
The boiler ignites well but loses the flame after a few seconds.
Cause: The maintenance coil of the gas valve does not maintain the gas flow after ignition.
Check the ionization electrode and its wiring; a poor connection can cause the same issue as the gas valve.
Fagor fault codes that require diagnosis
| Code | Fault | Technical checks |
|---|---|---|
| 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
- Uniclima internal SKU
- VGFEE26MA
- Brand
- Fagor
- Type of part
- Gas valves
- Units in stock
- 3 units
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- Delivery time shown at checkout
- Return
- 14 days
Part data and available documentation
Contrast the label codes, PCB, and revision with the installed part; they are not necessarily equivalent references.
- Valve model
- 845 Sigma
- Variant
- Allgas
- Component manufacturer
- SIT
- Place of manufacture
- Padua (Italy)
- Part code (label)
- 0063AS4831
Frequently asked questions about the gas valve MU0809100
Who manufactures this gas valve for the Fagor FE20E1N?
Does this SIT 845 Sigma valve work for the entire Fagor FE/FEE/FA/CE series?
Where is this SIT valve that the Fagor CE uses manufactured?
Spare parts related to Fagor Eco Compact FE-20E
