XP600 Pressure Switch For Hermann And Saunier Duval Thema F24 NOx - Ref. H049005816
When you open the tap or turn on the heating, the pressure switch XP600 for Hermann and Saunier Duval Thema F24 NOx - Ref. H049005816 is responsible for checking the pressure and allowing the boiler to operate. If it fails, the boiler may not start or may lock out, even if the actual pressure is correct, which can lead to faults such as 09 or F.73. This pressure switch is compatible with boilers from the Hermann Habitat 2, Master, and Micra ranges, among others. You should replace it when you notice that the boiler does not respond correctly to the demand for domestic hot water or heating.
VAT included
Consult via WhatsAppSaunier Duval boilers compatible with reference H049005816
Pressure switch with reference H049005816. 14 verified compatibilities: Habitat 2 23 e and Habitat 2 24 SE.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Saunier Duval Habitat 2 23 e | Hermann Habitat 2 | Contrasted |
| Saunier Duval Habitat 2 24 SE | Hermann Habitat 2 | Contrasted |
| Saunier Duval Habitat 2 28 SE | Hermann Habitat 2 | Contrasted |
| Saunier Duval Master 23 e | Hermann Master | Contrasted |
| Saunier Duval Master 24 SE | Hermann Master | Contrasted |
| Saunier Duval Master 30 SE | Hermann Master | Contrasted |
| Saunier Duval Master 321 SE | Hermann Master | Contrasted |
| Saunier Duval Master Cond 26 | Hermann Master | Contrasted |
| Saunier Duval Master Cond 32 | Hermann Master | Contrasted |
| Saunier Duval Micra 2 23 e | Hermann Micra 2 | Contrasted |
| Saunier Duval Micra 2 24 SB SE | Hermann Micra 2 | Contrasted |
| Saunier Duval Micra Condensing 26 | Hermann Micra Condensing | Contrasted |
| Saunier Duval Micra Condensing 26 SB | Hermann Micra Condensing | Contrasted |
| Saunier Duval Micra Alta Efficienza 24 | Hermann Micra Condensing | 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. H049005816 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 H049005816. 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 H049005816 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 shuts off after a few seconds without producing a flame.
Cause: The air pressure switch does not detect the correct depression of the extractor, and the control board cuts off the gas supply for safety.
Check that the fan spins freely and at normal speed, without any strange noises, before replacing the pressure switch.
- 02
The panel displays a lock code related to air or flue gas evacuation and the extractor does not start.
Cause: If the pressure switch is faulty or the contact is stuck, the control board believes that the flue is not safe and does not initiate the ignition.
Check that the silicone tubes connecting the pressure switch to the venturi and the flue are properly connected at both ends.
- 03
The boiler works well for a few days and then intermittently locks out, without a clear pattern.
Cause: A pressure switch with an aged diaphragm or worn contact may fail when vibrating or heating up, not always.
Note whether the lockout occurs when starting cold or after several hours of operation; this helps to distinguish the pressure switch from a fault in the fan.
- 04
Water or moisture is coming out of the pressure switch tube and the boiler locks out, especially on days with high domestic hot water usage.
Cause: In the condensation models of this range, the condensate can accumulate in the tube and distort the pressure reading.
Bleed and dry the connection pipes of the pressure switch before considering it faulty, especially if your model is a condensing one.
- 05
The extractor sounds forced or different from usual just before the lockout.
Cause: It may be that the extractor does not generate sufficient pressure, not the pressure switch, which simply reports it correctly.
First, rule out the state of the fan (noise, free rotation) to avoid replacing a pressure switch that is functioning properly.
Fault codes from Saunier Duval that this spare part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| 09 | Water pressure detector/pressure switch fault. | The pressure switch/sensor does not deliver a valid signal (open or short-circuited) and the PCB detects the fault; check the continuity/signal of the pressure switch and compare with the actual pressure using a manometer. |
| F.73 | Water pressure sensor fault (interruption/short circuit). | The signal from the pressure switch/sensor is out of service (open, grounded, or shorted), so the boiler does not read valid pressure; check the wiring and the sensor signal against the measured pressure. |
| F.74 | Water pressure sensor signal out of range (too high/low depending on model). | The pressure switch/sensor delivers voltage out of range (short circuit to 5V/24V or internal fault); check the sensor's output voltage and wiring and compare with the actual pressure. |
| F.75 | Pump error/lack of water: the pressure sensor does not detect an increase when the pump starts. | Due to a faulty pressure switch/sensor or lack of pump flow, the reading does not change at the start; check pressure variation at startup with a manometer and sensor signal, as well as bleed/pump condition. |
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 H049005816
- Catalogue reference
- H049005816
- Brand
- Saunier Duval
- Type of part
- Pressure switches
- Units in stock
- 1 unit
- 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.
- model
- XP600
- contacts
- 10(2)250~ (10A resistive / 2A inductive, 250V~)
- pressure range (set)
- 0.2÷1.2 bar
Manuals and technical documentation
Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.
- Saunier Duval Micra 2 24 SB SE Manual (PDF)Document © Saunier Duval, provided as a technical reference.
Frequently asked questions about the pressure switch H049005816
Is this pressure switch suitable for my Hermann Habitat 2 24 SE?
Does this same pressure switch work for the Saunier Duval Thema F24 NOx?
What electrical contacts does the XP600 pressure switch from Hermann Micra have?
Spare parts related to Saunier Duval Hermann Master
