What does the fault code C1 mean on Neckar?

The pressure switch has activated during operation. The air pressure switch detects a loss of depression/draught (obstruction in venturi/hoses or fatigued diaphragm) and opens the circuit; check continuity in COM/NO while the fan starts and inspect connections, tubes, and venturi.

What does the fault code C4 mean on Neckar?

The pressure switch does not open in the rest position. The contact of the pressure switch remains closed at rest due to a stuck diaphragm or blocked tube; check with a multimeter that the micro switch opens without depression and clean/renew hoses and connection to the venturi.

What does the C6 code mean on Neckar?

The pressure switch (differential) does not close. With the fan running, the minimum depression is not reached due to lack of draft/obstruction or a misadjusted/faulty pressure switch; measure the electrical closure of the micro when applying depression and check the flue, venturi, and tubes.

RefurbishedNeckar Pressure switches

Air Pressure Switch Neckar Bosch Novastar New 24 AE Ref. 87161461360

Name: Air Pressure Switch Neckar Bosch Novastar New 24 AE Ref. 87161461360
Brand: Neckar
SKU: PCNN24AE
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. Reference 87161461360. Includes a one-year warranty and delivery within 2–4 working days in the EU.

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Delivery in 2–4 working days

1-year warranty

14-day return

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Key Data

Reference: 87161461360
Brand: Neckar
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

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)
C1	The pressure switch has activated during operation.	The air pressure switch detects a loss of depression/draft (obstruction in venturi/hoses or fatigued diaphragm) and opens the circuit; check continuity in COM/NO while the fan starts and inspect connections, tubes, and venturi.
C4	The pressure switch does not open in the rest position.	The pressure switch contact remains closed at rest due to a stuck diaphragm or blocked tube; check with a multimeter that the micro switch opens without depression and clean/renew hoses and connection to the venturi.
C6	The pressure switch (differential) does not close.	With the fan running, the minimum depression is not reached due to lack of draft/obstruction or a misadjusted/faulty pressure switch; measure the electrical closure of the micro when applying depression and check the flue, venturi, and tubes.