Gas Valve Baxi Roca Nova NOx 24 24 F Ref. 125566521
It regulates and allows the flow of gas to the burner under the commands of the boiler's PCB. The Baxi Roca Nova NOX 24 24 F gas valve, manufactured by Honeywell and with reference 125566521, is essential for the operation of your heating system. If it fails, you will notice that the boiler does not ignite, and it may present flame lockouts or modulation issues. This valve is compatible with models such as Nova NOX 24/24 F, Deimos Box 24/24F, and Victoria Plus 24AF, among others. It is recommended to replace it when the mentioned symptoms occur or if fault codes E01 or E09 are displayed.
VAT included
Consult via WhatsAppBaxi boilers compatible with reference 125566521
Gas valve with reference 125566521. Three confirmed compatibilities: Novanox 24/24 F and Deimos Box 24/24F.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Baxi Novanox 24/24 F | Nova NOX | Contrasted |
| Baxi Deimos Box 24/24F | Deimos / Demios | Contrasted |
| Baxi Victoria Plus 24AF | Victoria Plus | 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 ref. 125566521 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 125566521. 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 125566521 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 any flame and indicates a fault with ignition or gas.
Cause: The gas valve does not open the gas flow when instructed, although the rest of the ignition works well.
Check that the incoming gas pressure is correct and that the main valve is fully open before replacing the gas valve.
- 02
The flame burns well for a while and then goes out on its own, without the boiler showing a clear fault.
Cause: The internal electromagnet of the gas valve is losing strength and cutting off the gas prematurely.
Check if the cut always occurs after the same operating time; this helps to determine if it is a fault with the gas valve or the sensor.
- 03
When requesting hot water, the flame suddenly rises and a small bang is noticeable.
Cause: The gas valve does not regulate the gas flow properly when switching from standby to demand, delivering more gas than is burned at once.
Check the condition of the burner and clean the heat exchanger before assuming that the problem is only with the gas valve.
- 04
The boiler locks up with a fault code and only starts after being unplugged and reset.
Cause: The valve does not open or close within the time that the control board expects, which causes it to cut the cycle for safety reasons.
Note the fault code displayed by the boiler; some codes indicate more of an issue with the electronics than with the gas valve.
Fault codes Baxi that this part resolves
| Code | Fault | Diagnosis and solution |
|---|---|---|
| E01 | The boiler does not ignite because the flame is not detected. | The gas valve is not opening or is not properly calibrated, so gas is not reaching the burner and the flame is not being produced. Check if the coils are receiving power, measure the resistance of the coils with a multimeter, and check the pressure with a manometer. |
| E09 | Problem in the gas valve safety system. | There is a fault in the connection or control of the gas valve, whether in the wiring, the modulator, or the PCB, that prevents it from operating safely. Check the continuity of the wires and connectors, the signal reaching the valve, and act according to the results of the electrical test. |
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 Baxi gas valve 125566521
- Catalogue reference
- 125566521
- Brand
- Baxi
- Type of part
- Gas valves
- Units in stock
- 3 units
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- Delivery time shown at checkout
- 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.
- type
- TYPE ERS1060
Frequently asked questions about the gas valve 125566521
Is this valve suitable for a Baxi Roca Nova NOX 24/24 F?
Is this valve suitable for a Baxi Roca Deimos Box 24/24F?
What other models are compatible with this gas valve?
How many models are compatible with the Baxi Roca gas valve VGNN24F?
What fault codes are documented for this gas valve?
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