Saunier Duval Water Pressure Switch Safety Thelia AS 23 Ref. 05261500
If your boiler does not start or gets blocked even though the actual pressure is correct, you may need the Saunier Duval water pressure switch for the Thelia AS 23. This part is responsible for monitoring the water pressure and authorizing the operation of the boiler. When it fails, it is common for the boiler to have starting issues. This pressure switch is compatible with several models, such as Thelia 23, Thelia 23 E, Thelia 623, among others. It should be replaced when you detect these symptoms of malfunction.
VAT included
Consult via WhatsAppSaunier Duval boilers compatible with reference 05261500
Pressure switch with reference 05261500. 19 verified compatibilities: Combitek C 23 and Combitek C 23 E.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Saunier Duval Combitek C 23 | Combitek | Contrasted |
| Saunier Duval Combitek C 23 E | Combitek | Contrasted |
| Saunier Duval Combitek F 23 | Combitek | Contrasted |
| Saunier Duval Combitek F 23 E | Combitek | Contrasted |
| Saunier Duval Thelia 23 | Thelia | Contrasted |
| Saunier Duval Thelia 23 E | Thelia | Contrasted |
| Saunier Duval Thelia 623 | Thelia | Contrasted |
| Saunier Duval Thelia 623 E | Thelia | Contrasted |
| Saunier Duval Thelia AS 23 | Thelia | Contrasted |
| Saunier Duval Thema C 23 | Thema | Contrasted |
| Saunier Duval Thema C 23 E | Thema | Contrasted |
| Saunier Duval Thema F 23 | Thema | Contrasted |
| Saunier Duval Thema F 23 E | Thema | Contrasted |
| Saunier Duval Themaplus C 23 E | Themaplus | Contrasted |
| Saunier Duval Themaplus F 23 E | Themaplus | Contrasted |
| Saunier Duval Themis 23 E | Themis | Contrasted |
| Saunier Duval Themis 23 ME | Themis | Contrasted |
| Saunier Duval Themis AS 14 | Themis | Contrasted |
| Saunier Duval Themis AS 23 | Themis | 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. 05261500 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 05261500. 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 pressure switch 05261500 resolves.
The pressure switch controls the air or water pressure to authorize operation. These are the typical symptoms and what to do:
Common symptoms and faults
- 01
You press the power button, you hear the fan start up, and after a few seconds the boiler stops without igniting.
Cause: The pressure switch does not close the air contact and the control board cuts off the gas supply for safety.
Check that the silicone tubes connecting the pressure switch to the fan are not disconnected, bent, or filled with water.
- 02
The boiler occasionally locks out, especially when there is strong wind outside.
Cause: The pressure switch operates close to its set point, and a gust in the flue gas outlet can cause it to lose contact.
Check the flue terminal outside to see if the wind is directly affecting it or if there is something obstructing the grille.
- 03
The fan runs longer than usual before the boiler attempts to ignite.
Cause: The pressure switch takes time to switch because the internal diaphragm is stuck or there is a small leak in the tubes that reduces the pressure.
Check that the fittings of the tubes fit well into the nozzles of the pressure switch and the fan, without cracks.
- 04
It had not been used all summer, and now, with the cold, it is difficult to start on the first try.
Cause: The accumulated condensation in the pipes during the shutdown partially blocks the airflow to the pressure switch.
Remove the silicone tubes and check that there is no water or dirt left inside before replacing the part.
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.
Saunier Duval 05261500 pressure switch datasheet
- Catalogue reference
- 05261500
- Brand
- Saunier Duval
- Type of part
- Pressure switches
- Units in stock
- 7 units
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- Delivery time shown at checkout
- Return
- 14 days
Manuals and technical documentation
Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.
- Saunier Duval Thema F 23 E Manual (PDF)Document © Saunier Duval, provided as a technical reference.
Frequently asked questions about the pressure switch 05261500
Is the Saunier Duval water pressure switch reference 05261500 compatible with the Thelia 623 E boiler?
What boiler models are compatible with the water pressure switch PSTAS23?
What should I do if my boiler is experiencing pressure issues?
Does this pressure switch have documented fault codes?
Where can I find more information about the installation of the pressure switch PSTAS23?
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