Saunier Duval Isofast F35 E Air Pressure Switch Honeywell Ref. 05733900
Air pressure switch for Saunier Duval Isofast F35 and F35 E boilers. The component is manufactured by Honeywell (Yamatake series, code C6065FH1326:2), made in Japan, and calibrated at 0.60 mbar with a maximum of 6 mbar. It detects the air pressure generated by the fan and allows or cuts off the burner ignition. It is replaced when the switching fails and the boiler does not ignite or gets locked.
VAT included
Consult via WhatsAppSaunier Duval boilers compatible with reference 05733900
Pressure switch with reference 05733900. 15 verified compatibilities: Isofast F30 E and Isofast F30 EH.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Saunier Duval Isofast F30 E | Isofast | Contrasted |
| Saunier Duval Isofast F30 EH | Isofast | Contrasted |
| Saunier Duval Isofast F35 E1 | Isofast | Contrasted |
| Saunier Duval Isofast F35 E H-MOD | Isofast | Contrasted |
| Saunier Duval Themafast F25 E | Themafast | Contrasted |
| Saunier Duval Themafast F25 E H-MOD | Themafast | Contrasted |
| Saunier Duval Themafast F30 E | Themafast | Contrasted |
| Saunier Duval Themafast F30 E H-MOD | Themafast | Contrasted |
| Saunier Duval Isotwin F28 E-A | Isotwin | Contrasted |
| Saunier Duval Isotwin F30 H-MOD | Isotwin | Contrasted |
| Saunier Duval Themaclassic F AS 30 E | Themaclassic | Contrasted |
| Saunier Duval Thema F25 E STL | Thema | Contrasted |
| Saunier Duval Opalia F17 E | Opalia | Contrasted |
| Saunier Duval Opaliafast F17 E | Opalia | Contrasted |
| Saunier Duval Isomax F28 E2 | Isomax | 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. 05733900 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 05733900. 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 05733900 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 locks up as soon as the fan starts, before the ignition sounds.
Cause: The pressure switch must close the contact when it detects sufficient air pressure; if it does not, the process does not start.
Make sure that the fan reaches its normal speed and does not sound forced before declaring the pressure switch faulty.
- 02
The fault code given by the boiler alternates between air fault and ignition fault depending on the day.
Cause: An unstable switching of the pressure switch can result in different readings on each attempt, even if the origin is the same.
Note the codes that appear in several consecutive attempts to confirm that they always point to the air circuit.
- 03
After a cleaning or inspection of the boiler, the ignition fault still appears the same.
Cause: If the pressure switch is damaged, neither cleaning the burner nor the duct resolves the blockage.
Check that the pressure switch connection tubes are properly placed after the inspection, as this is a point that is often overlooked.
- 04
The boiler takes several attempts to ignite and sometimes gets completely locked.
Cause: A pressure switch that switches with a delay causes the control unit to exhaust the allowed ignition attempts.
Check the electrical continuity of the pressure switch with a multimeter before replacing it, especially if the fault is intermittent.
Fault codes from Saunier Duval that this spare part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| F2 | Safety Flue Terminal (SFT) or pressure switch. | The air pressure switch does not switch when the fan starts (does not close the circuit) due to loss of sensitivity, damaged diaphragm, or blocked pressure switch/venturi ports/tubes; check by applying controlled vacuum and measuring continuity at contacts, and inspecting tubes and electrical connection. |
| F33 | Air flow fault. | The air pressure switch detects a lack of depression/flow (open or blocked contact), usually due to a defective pressure switch or dirty connections/venturi/pipes; check with a switching test (applying depression) and reading the state, and inspect/clean the connections and wiring. |
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 Pressure Switch Datasheet 05733900
- Catalogue reference
- 05733900
- 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
- C6065FH1326:2
- Voltage
- 250V~
- Associated capacitor
- 1.5 (0.5) µF
- Set pressure
- P=0.60 mbar
- Maximum pressure
- 6 mbar
- CE code
- CE-0063AP3085/1
- Lower code (possible batch/date)
- 9924D
- Place of manufacture
- Made in Japan
- The printed manufacturer is Honeywell (Yamatake series); it is not a Saunier Duval component, although the brand installs it in their boilers.
Manuals and technical documentation
Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.
- Saunier Duval Themaclassic F AS 30 E Manual (PDF)Document © Saunier Duval, provided as a technical reference.
Frequently asked questions about the pressure switch 05733900
Who manufactures the pressure switch for the Saunier Duval Isofast F35 E?
What code does the pressure switch for the Isofast F35 E have?
What pressure is the pressure switch of the Isofast F35 calibrated to?
For which Saunier Duval boilers is this Honeywell pressure switch Ref. 05733900 suitable?
What fault does replacing this pressure switch resolve in the Isofast F35 E?
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