Saunier Duval Isofast F30 E H Air Pressure Switch - Ref. 605.99534
Differential air pressure switch for Saunier Duval Isofast boilers, with a switching setting of 59/51 Pa and part code 605.99534, manufactured in week 38 of 2005. It controls the pressure of the extractor before the burner ignition. It is replaced when the boiler does not start or shows an air pressure switch fault.
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 does not ignite and shows an air pressure switch fault.
Cause: The pressure switch does not detect the pressure difference between its terminals and does not close the contact to turn on.
Before replacing it, check the two pressure connections: if any of the pipes are blocked or disconnected, the fault will be the same.
- 02
The extractor works, but the boiler does not validate the pressure and does not ignite.
Cause: The fan changes speed and the pressure switch must respond to those variations; if it does not, the cycle is interrupted.
Check if the fault occurs only at minimum power or also at maximum: this helps to identify if it is a range issue or a blockage.
- 03
The boiler locks up when starting, and it needs to be reset for it to try again.
Cause: The safety lock is activated when the pressure switch does not confirm the depression within the time expected by the control board.
Check the condition of the flue duct, especially if it is coaxial: a partially obstructed outlet affects this pressure switch.
- 04
The fault had not occurred and suddenly appears after cleaning or inspecting the boiler.
Cause: When handling the silicone tubes, they may become misaligned or bent, and this pressure switch is sensitive to changes in pressure.
Check that both silicone tubes are properly connected after the last intervention before considering the part faulty.
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
- 20 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.
- Label code
- 605.99534
- Set (opening/closing)
- 59/51 Pa
- Contact electric charge
- 1(0.5)A / 250V~
- Internal code
- 116189
- Batch code
- VFWDIF
- Manufacturing date (week/year)
- 38/05 (week 38 of 2005)
Frequently asked questions about the pressure switch S5744100
Is this pressure switch from the Saunier Duval Isofast F30 E H compatible with a Themafast F25 E?
What code should be printed on the pressure switch of the Saunier Duval Isofast F30 E H?
What fault indicates that the air pressure switch of the Isofast F30 E H needs to be replaced?
Is the pen brand that appears on the pressure switch label of the Isofast F30 E H factory-made?
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