Honeywell Air Pressure Switch Saunier Duval Isofast F28E Ref. S5744000
Honeywell air pressure switch (screen-printed Yamatake-Honeywell), model C6065FH1276:2, for Saunier Duval boilers from the Isofast, Isomax, Isotwin, Opalia, and Themafast series. It controls the air/smoke pressure and allows the burner to ignite when it detects the correct value. Manufactured in Japan. The catalog reference S5744000 has also been assigned to a physically different design piece; ensure it matches your unit.
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Consult via WhatsAppSaunier Duval boilers compatible with reference S5744000
Pressure switch with reference S5744000. Two confirmed compatibilities: Isofast F 28 E and Isofast F 28 E1.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Saunier Duval Isofast F 28 E | Isofast | Contrasted |
| Saunier Duval Isofast F 28 E1 | Isofast | 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. S5744000 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 S5744000. 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 S5744000 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 locks up as soon as the fan starts.
Cause: The pressure switch needs to confirm that there is sufficient draft in the flue before allowing ignition.
Check that the flue pipe is not blocked, bent, or that the external terminal is not covered.
- 02
There are several consecutive resets with an anomaly indicator light on.
Cause: Each failed attempt to detect the correct pressure causes the control board to retry and eventually lock the unit.
Check the length and condition of the flue pipe; an installation with long sections can affect the reading.
- 03
The fault mainly occurs when it is windy or raining.
Cause: External conditions can modify the pressure at the flue gas outlet and take it out of the range that the pressure switch considers valid.
Note if the blockage coincides with bad weather before declaring the part defective.
- 04
The fault occurs right after a cleaning or inspection of the flue duct.
Cause: A poorly repositioned pipe after the intervention prevents the pressure switch from receiving the actual pressure of the system.
Check the silicone tube connections to the pressure switch after any manipulation of the flue.
Fault codes from Saunier Duval that this spare part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| 02 | Airflow/flue fault (flue safety). | The air pressure switch does not switch when the fan starts (damaged diaphragm/contacts, obstructed intake tubes, or poor connection), so the PCB detects a lack of pressure drop and triggers the air fault; verify by measuring the continuity of the pressure switch (Pr terminals) with a multimeter during startup, and check the pressure and exhaust tubing. |
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 the Saunier Duval pressure switch S5744000
- Catalogue reference
- S5744000
- 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.
- Manufacturer
- Honeywell (Yamatake-Honeywell)
- Component code
- C6065FH1276:2
- Pressure setting
- P= 0.53 mbar (max. 6 mbar)
- Contact voltage
- 250V~
- CE certification code
- CE-0063AP3085/1
- Date/lot code
- 9936D
- Place of manufacture
- MADE IN JAPAN
- This piece is physically different from others on the same worksheet: it is a black box pneumatic pressure switch by Yamatake-Honeywell, MADE IN JAPAN, whereas other units in the category have a different round body.
Frequently asked questions about the pressure switch S5744000
Who manufactures the Honeywell air pressure switch Saunier Duval Isofast F28E?
Is this pressure switch for air or water?
How many models are compatible with the Honeywell Saunier Duval Isofast F28E air pressure switch?
What fault does this pressure switch resolve in the Isofast F 28 E boiler?
What is the reference for this pressure switch?
What documented fault code is associated with this pressure switch?
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