How do I know if this pressure sensor is the one for my boiler?

Verify the reference PSN0001 printed and ensure your model is on the list of compatible ones; also compare the connections with the original part. It is a Saunier Duval part.

The pressure sensor measures the water pressure of the circuit for the electronics.

Which models is it suitable for?

Part shared by various models (see Compatibility). If your model does not appear, send us a photo of the marking and we will confirm it.

Installation and recommendations

Check the connector and the gasket.

What does refurbished mean and what coverage does it have?

Part removed from a boiler out of service, inspected and tested. Includes 1-year warranty and 14-day return policy. Delivery within 2–4 working days in the EU.

What does fault code 09 mean in Saunier Duval?

Water pressure detector fault The pressure sensor (PSN0001) is faulty, disconnected, or out of range, and the PCB is not receiving a valid pressure signal; check the wiring and measure the sensor resistance at 0/1/3 bar according to service values to confirm.

RefurbishedSaunier Duval Pressure sensors

Saunier Duval Pressure Sensor Isofast F28 E Ref. PSN0001

Name: Saunier Duval Pressure Sensor Isofast F28 E Ref. PSN0001
Brand: Saunier Duval
SKU: SPSDIF28E
Price: 15 EUR
Availability: InStock

15 €VAT includedIn stock · 5 units

Pressure sensor: refurbished spare part that measures water pressure for the electronics. Useful if there is a pressure fault even though the pressure gauge reads correctly. Compatible with Isofast C 28 E, Isofast C 28 E1, Isofast C 35 E (ref. PSN0001). Includes a one-year warranty and delivery within 2–4 working days in the EU.

Consult via WhatsApp

Not sure if it's your part? Send us a photo of the screen printing via WhatsApp and we'll confirm compatibility before you purchase.

Delivery in 2–4 working days

1-year warranty

14-day return

Technical support

Key Data

Reference: PSN0001
Brand: Saunier Duval
Type of part: Pressure sensors
Available units: 5 units in stock
Status: Refurbished
Warranty: 1 year
Shipping: 2–4 working days (EU)
Return: 14 days

The same part (ref. PSN0001) equips these models. Verified compatibility; check the reference before purchasing.

Saunier Duval

Isofast C 28 E
Isofast C 28 E1
Isofast C 35 E
Isofast F 28 E
Isofast F 28 E1
Isofast F 35 E
Themafast C 24 E
Themafast C 25 E
Themafast C 28 E
Themafast C 30 E
Themafast F 24 E
Themafast F 25 E
Themafast F 30 E
Isomax C 28 E
Isomax F 28 E
Isomax F 35 E
Isotwin C 24 E
Isotwin C 28 E
Isotwin F 24 E
ThemaClassic C 24 E
ThemaClassic F 24 E
ThemaClassic F 25 E
Thematek C 24 E
Thematek F 24 E

Fault codes related to this part (not the entire boiler). They usually have more possible causes: first rule out electrodes, wiring/connections, and gas supply. Verified with ≥3 sources.

Code	What does it mean?	Cause and diagnosis (this part)
09	Water pressure sensor fault	The pressure sensor (PSN0001) is faulty, disconnected, or out of range, and the PCB is not receiving a valid pressure signal; check the wiring and measure the sensor's resistance at 0/1/3 bar according to service values to confirm.

How do I know if this pressure sensor is the one for my boiler?: Verify the reference PSN0001 printed and ensure your model is on the list of compatible ones; also compare the connections with the original part. It is a Saunier Duval part.
What is it used for?: The pressure sensor measures the water pressure of the circuit for the electronics.
Pressure fault even though the pressure gauge reads correctly?: The sensor is not transmitting the correct pressure to the PCB.
Which models is it suitable for?: Part shared by various models (see Compatibility). If your model does not appear, send us a photo of the marking and we will confirm it.
Installation and recommendations: Check the connector and the gasket.
What does refurbished mean and what coverage does it have?: Part removed from a boiler out of service, inspected and tested. Includes 1-year warranty and 14-day return policy. Delivery within 2–4 working days in the EU.

Saunier Duval Pressure Sensor Isofast F28 E Ref. PSN0001

Key Data

Saunier Duval

Related Spare Parts Boiler Sensor Isofast F28 E