3-Way Valve Boiler Laura 20 A And Others - Ref. 122450340
The 3-way valve for the Laura 20 A boiler and others is a component responsible for switching the water between the heating circuit and the domestic hot water circuit. When it fails, you may notice that the hot water works, but the heating does not, or vice versa, and there may even be a mixing of both circuits. This valve is compatible with Baxi Roca boilers from the Laura range, such as the Laura 20, Laura 20/20, and Laura 20/20 F models, among others. A technician must confirm through diagnosis whether it is necessary to replace it when you experience these symptoms of improper operation.
- Type of part
- 3-way valves
- Status
- Refurbished
- Catalogue reference
- 122450340
- Warranty
- 1 year
Baxi Roca boilers compatible with reference 122450340
3-way valve with reference 122450340. Three confirmed compatibilities: Laura 20 and Laura 20/20.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Baxi Roca Laura 20 | Baxi Roca Laura | Contrasted |
| Baxi Roca Laura 20/20 | Baxi Roca Laura | Contrasted |
| Baxi Roca Laura 20/20 F | Baxi Roca Laura | 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. 122450340 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 122450340. If it is not visible, do not identify the part by 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 3-way valve 122450340
The 3-way valve diverts water between heating and domestic hot water. These are the typical symptoms and what to do:
Common symptoms and faults
- 01
You have hot water at the tap, but the radiators are not heating at all, even though the boiler is on and modulating.
Cause: The motor is stuck in the DHW position and does not release the flow to the heating circuit.
Check if the fault occurs right when requesting heating with the thermostat; if everything works normally in domestic hot water, it points to the gas valve.
- 02
The boiler provides heating without any issues, but it does not supply hot water when you turn on the tap.
Cause: The actuator does not divert to domestic hot water because the motor does not turn or has become stuck halfway.
Open and close the tap a couple of times in quick succession: if it takes much longer than normal to provide hot water or never reaches it, the motor is not switching.
- 03
A metallic noise or a strange buzzing is heard just when switching from heating to domestic hot water or vice versa.
Cause: It is usually due to the internal gear of the motor being worn out and slipping before engaging.
Note the exact moment it sounds (when turning on, when requesting domestic hot water) to confirm that it coincides with the service change and not with another part.
- 04
The valve seems to be moving, but the boiler continues to show an error and does not stabilize either heating or domestic hot water.
Cause: The motor may start to turn but not complete the movement if the shaft is seized due to limescale or dirt.
With the boiler turned off and cold, manually check if the motor shaft rotates smoothly to the limit or stops beforehand.
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 Roca 3-way valve 122450340
- Catalogue reference
- 122450340
- Uniclima internal SKU
- MVRL20A
- Brand
- Baxi Roca
- Type of part
- 3-way valves
- Units in stock
- 7 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.
- Actuator code
- 1650/5/0.00
- Supply voltage
- 220V-240V
- Thermal class
- T60
- Frequency
- 50Hz
- Manufacturing date / batch
- 20/05/02
- Secondary code (without known context)
- 170.
Manuals and technical documentation
Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.
- Baxi Roca Laura 20/20 F Manual (PDF) Document © Baxi Roca, provided as a technical reference.
Frequently asked questions about the 3-way valve 122450340
Is this valve compatible with the boiler Laura 20 A?
Which boilers are compatible with the 3-way valve Ref. 122450340?
What symptoms indicate that I need to change the 3-way valve?
What is the voltage and thermal class of the valve of the Laura 20 AF?
What is the reference for the 3-way valve for the Laura 20 A boiler?
Are there documented fault codes for this gas valve?
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