How do I know if this pressure switch is for my boiler?

Verify the reference 05600800 printed and ensure your model is on the list of compatible ones; also compare the connections with the original part.

The pressure switch controls the pressure/draught (of air in sealed systems) or water to authorize operation.

Is the boiler not starting or showing a draught fault?

If the fan spins but does not ignite, check the pressure tubes (loose/blocked), the diaphragm, and the fan.

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 tightness of the pressure pipes and the switching of the contact.

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 02 mean on Saunier Duval?

Air fault (SRC or pressure switch). The air pressure switch does not switch with the fan due to lack of depression or blocked pipes/tappings; check the continuity of the pressure switch during start-up and measure depression with a manometer at the pressure switch ports.

RefurbishedSaunier Duval Pressure switches

Saunier Duval Air Pressure Switch Master Twin L 85 E Honeywell Ref. 05600800

Name: Saunier Duval Air Pressure Switch Master Twin L 85 E Honeywell Ref. 05600800
Brand: Saunier Duval
SKU: PCMTL85E
Price: 25 EUR
Availability: InStock

25 €VAT includedIn stock · 5 units

Pressure switch: refurbished spare part that controls air or water pressure to authorize operation. Useful if the boiler does not start or shows a draft error. Compatible with Thelia Twin 28 E, Thelia 30 E, Opalia F 13 E (ref. 05600800). 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: 05600800
Brand: Saunier Duval
Type of part: Pressure switches
Available units: 5 units in stock
Status: Refurbished
Warranty: 1 year
Shipping: 2–4 working days (EU)
Return: 14 days

The same part (ref. 05600800) equips these models. Verified compatibility; check the reference before purchasing.

Thelia Twin

Thelia Twin 28 E

Thelia

Thelia 30 E

Opalia

Opalia F 13 E
Opalia X 13

Sylva

Sylva FF 24 E

Twin

Twin F 24 E
Twin F 28 E

Master Twin

Master Twin L 85 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)
02	Air fault (SRC or pressure switch).	The air pressure switch does not switch with the fan due to lack of depression or obstructed pipes/tappings; check the continuity of the pressure switch during start-up and measure depression with a manometer at the pressure switch tappings.

How do I know if this pressure switch is for my boiler?: Verify the reference 05600800 printed and ensure your model is on the list of compatible ones; also compare the connections with the original part.
What is it used for?: The pressure switch controls the pressure/draught (of air in sealed systems) or water to authorize operation.
Is the boiler not starting or showing a draught fault?: If the fan spins but does not ignite, check the pressure tubes (loose/blocked), the diaphragm, and the fan.
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 tightness of the pressure pipes and the switching of the contact.
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.