Junkers Air Pressure Switch ZWE 24 2KDG 31 S2800 Ref. 8717406050
RefurbishedJunkersPressure switches

Junkers Air Pressure Switch ZWE 24 2KDG 31 S2800 Ref. 8717406050

10 €VAT includedIn stock · 1 unit

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 ZWE 24-2KDG 31 S2800, ZWE 24-3MFA, ZWE 28-3MFA (ref. 8717406050). Includes a one-year warranty and delivery within 2–4 working days in the EU.

1
Consult via WhatsApp
Delivery in 2–4 working days
1-year warranty
14-day return
Technical support

Key Data

Reference
8717406050
Brand
Junkers
Type of part
Pressure switches
Available units
1 unit in stock
Status
Refurbished
Warranty
1 year
Shipping
2–4 working days (EU)
Return
14 days

The same part (ref. 8717406050) equips these models. Verified compatibility; check the reference before purchasing.

Junkers Eurostar ZWE

  • ZWE 24-2KDG 31 S2800
  • ZWE 24-3MFA
  • ZWE 28-3MFA

Junkers Novatherm ZWE

  • ZWE 24-2KDG

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.

CodeWhat does it mean?Cause and diagnosis (this part)
C1The differential pressure switch is activated/opens during operation.The air pressure switch opens due to loss of pressure or internal fault (membrane/contacts). Verify by measuring that the contact switches to open with the fan running and checking connections/venturi and hoses.
C4The differential pressure switch does not open at rest (with the fan stopped).The pressure switch remains 'stuck' closed or there is residual depression in the line. Verify that with the fan stopped, the contact is open and that the pressure switch changes state when blowing/sucking on the inlets; check hoses/Venturi.
C6The air pressure switch contact does not close on start-up.The required depression is not reached or the pressure switch fails (rigid diaphragm/calibration/blocked inlets). Verify by applying depression and checking that the contact closes with a multimeter; inspect the tubes towards the venturi/fan and the flue line.
How do I know if this pressure switch is for my boiler?
Verify the reference 8717406050 printed and ensure your model is on the list of compatible ones; also compare the connections with the original part. It is a Huba 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.

Spare Parts Related Boiler ZWE 24 2KDG 31 S2800

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