Air Pressure Switch Boiler Themafast F 30 E - Ref. 605.99534
If your boiler does not start or gets blocked despite the pressure being correct, you may need the air pressure switch for the Themafast F 30 E boiler - Ref. 605.99534. This component checks the air pressure and allows the boiler to operate. When it fails, it may display the fault code 02: Air flow safety. It is compatible with models such as Themafast F 30 E, F 25 E, among others. It is recommended to replace it if you notice that the boiler is not responding properly.
VAT included
Consult via WhatsAppSaunier Duval boilers compatible with reference S5744100
Pressure switch with reference S5744100. 21 verified compatibilities: F 30 E H-MOD and F 35 E1.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Saunier Duval F 30 E H-MOD | Isofast | Contrasted |
| Saunier Duval F 35 E1 | Isofast | Contrasted |
| Saunier Duval F 35 E H-MOD | Isofast | Contrasted |
| Saunier Duval F 28 E2 | Isomax | Contrasted |
| Saunier Duval F 28 EA | Isotwin | Contrasted |
| Saunier Duval F 30 E H-MOD | Isotwin | Contrasted |
| Saunier Duval F 30 E | Isosplit | Contrasted |
| Saunier Duval F 35 E | Isosplit | Contrasted |
| Saunier Duval F 35 E H-MOD | Isosplit | Contrasted |
| Saunier Duval F 25 E | Themafast | Contrasted |
| Saunier Duval F 25 E H-MOD | Themafast | Contrasted |
| Saunier Duval F 30 E | Themafast | Contrasted |
| Saunier Duval F 30 E H-MOD | Themafast | Contrasted |
| Saunier Duval F 25 E | Thema | Contrasted |
| Saunier Duval F 25 E STL | Thema | Contrasted |
| Saunier Duval F AS 25 E | Thema | Contrasted |
| Saunier Duval F 25 E | Themaplus | Contrasted |
| Saunier Duval F 30 E | Themaplus | Contrasted |
| Saunier Duval F AS 30 E | Themaclassic | Contrasted |
| Saunier Duval F 17 E | Opalia | Contrasted |
| Saunier Duval F 17 E | Opaliafast | 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. S5744100 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 S5744100. 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 S5744100 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
The boiler tries to ignite, the fan starts, but it stops and gets locked without producing a flame.
Cause: The pressure switch does not detect the correct air pressure, and the control board interrupts the ignition cycle for safety.
Make sure that the silicone tubes do not have accumulated condensate water and are not bent before changing the pressure switch.
- 02
The extractor works normally, but the boiler does not progress beyond that phase and gets blocked.
Cause: If the pressure switch does not close the contact despite the fan running well, the PCB understands that there is not enough draft.
Check that the connections of the tubes to the pressure switch and the duct are properly fitted and have not come loose.
- 03
The fault appears intermittently: some days it starts up well and others it gets blocked.
Cause: A partial obstruction or a variable condensation point in the pipe can cause the pressure switch to switch just at the limit of its setting.
Check the flue duct and the exterior outlet for any dirt, nests, or ice that may reduce the draft.
- 04
The boiler displays a fault code related to the fan or flue gas evacuation.
Cause: It is the typical warning given by the control board when the pressure switch remains open longer than expected after the fan starts.
Before replacing it, clean the dust extractor and check that it spins freely without rubbing.
Fault codes from Saunier Duval that this spare part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| 02 | Air flow safety. | The air pressure switch S5744100 does not switch when the fan starts or does not detect the depression due to obstruction in tubes/venturi; check with a multimeter or manometer that the pressure switch changes state with the fan running and inspect tubes and connections. |
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.
Datasheet for Saunier Duval pressure switch S5744100
- Catalogue reference
- S5744100
- Brand
- Saunier Duval
- Type of part
- Pressure switches
- Units in stock
- 5 units
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- 1-2 business days
- 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.
- Component code
- 605.99534
- Switching pressure (open/close)
- 59/51 Pa
- Contact current/voltage
- 1(0.5)A / 250V~
- Internal code
- 116189
- Batch code
- DLKEJD
- Week/year marking (not explained on the label)
- 49/03
Frequently asked questions about the pressure switch S5744100
Is this air pressure switch from the Themafast F 30 E the same as the one used in the Themafast F 25 E?
What electrical contact does the pressure switch of the Themafast F 30 E support?
What fault of the Isosplit F 30 E is this pressure switch replaced for?
Is this pressure switch compatible with the Isotwin F 30 H?
Spare parts related to Saunier Duval Themafast
