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 Gas Valve Nova NOX 24 24 F, 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. A technician must confirm through diagnosis whether it needs to be replaced when the mentioned symptoms occur or if the fault codes E01 or E09 are displayed.

Type of part: Gas valves
Status: Refurbished
Catalogue reference: 125566521
Warranty: 1 year

VAT included Stock · 3 units

Compatibility

Baxi boilers compatible with reference 125566521

Gas valve with reference 125566521. Three confirmed compatibilities: Novanox 24/24 F and Deimos Box 24/24F.

Verified compatibility

Boiler model	Family	Verification
Baxi Novanox 24/24 F	Nova NOX	Verified
Baxi Deimos Box 24/24F	Deimos / Demios	Verified
Baxi Victoria Plus 24AF	Victoria Plus	Verified

Can't see your model or have questions? The printed reference takes precedence. How to check it · Send us a photo via WhatsApp.

Guide

How to check if the ref. 125566521 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 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.

Diagnosis and fault codes

Symptoms that require diagnosis in the gas valve 125566521

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.

Baxi fault codes that require diagnosis

Code	Fault	Technical checks
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.

Technical data

Data sheet for the Baxi gas valve 125566521

Catalogue reference: 125566521
Uniclima internal SKU: VGNN24F
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

Part data and available documentation

Contrast the label codes, PCB, and revision with the installed part; they are not necessarily equivalent references.

type: TYPE ERS1060

Frequently asked questions

Frequently asked questions about the gas valve 125566521

Is this valve suitable for a Baxi Roca Nova NOX 24/24 F?

Yes, this Baxi Roca gas valve, reference VGNN24F, is compatible with the Nova NOX 24/24 F model.

Is this valve suitable for a Baxi Roca Deimos Box 24/24F?

Yes, the Baxi Roca gas valve, reference VGNN24F, is compatible with the Deimos Box 24/24F model.

What other models are compatible with this gas valve?

In addition to the Nova NOX 24/24 F and Deimos Box 24/24F models, it is also compatible with the Victoria Plus 24AF model.

How many models are compatible with the Baxi Roca gas valve VGNN24F?

In total, there are 3 models confirmed as compatible with the Baxi Roca VGNN24F gas valve.

What fault codes are documented for this gas valve?

The documented fault codes for this gas valve are E01 and E09.

Delivery calculated by destination Delivery time shown at checkout

1-year warranty inspected and tested

14-day return uninstalled parts

Technical support we verify your model

Gas Valve Baxi Roca Nova NOx 24 24 F Ref. 125566521