What does the fault code C1 mean on Junkers?

The fan speed is not reached. The fan control PCB (Gebläsesteuerung, ref. 87483000300) may not correctly excite/regulate the motor, preventing it from reaching the speed; check by measuring the output from the PCB to the fan and ensure that the pressure switch closes with the airflow.

What does the fault code C6 mean on Junkers?

Differential pressure signal not detected. Fault in the fan control board causes the fan not to start or not to generate the required flow, and the differential pressure does not close; check voltage/controls from the board to the fan and rule out fan/wiring before replacing the board.

What does fault code C7 mean on Junkers?

Device does not detect a running fan. If the auxiliary fan control board does not supply or read the fan's tachometer signal, the boiler does not detect rotation; check for the presence of speed signal (tacho/Hall) at the connector to the board and ensure the fan is rotating correctly.

RefurbishedJunkers Extractors

Junkers Fan Control PCB Auxiliary ZWR2 4 2ADE23 Ref. 87483000300

Name: Junkers Fan Control PCB Auxiliary ZWR2 4 2ADE23 Ref. 87483000300
Brand: Junkers
SKU: PEAZWR242
Price: 45 EUR
Availability: InStock

45 €VAT includedIn stock · 1 unit

Extractor: reconditioned spare part that evacuates combustion gases with forced draft. Useful if it doesn't start due to draft failure, makes noise, or doesn't spin. Reference 87483000300. 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: 87483000300
Brand: Junkers
Type of part: Extractors
Available units: 1 unit 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	Fan speed is not reached.	The fan control PCB (Gebläsesteuerung, ref. 87483000300) may not properly excite/regulate the motor, preventing it from reaching the speed; check by measuring the output from the PCB to the fan and ensure that the pressure switch closes with the airflow.
C6	Differential pressure signal not detected.	Fault in the fan control board causes the fan not to start or not to generate the required flow, and the differential pressure does not close; check voltage/commands from the board to the fan and rule out fan/wiring before replacing the board.
C7	Device does not detect a running fan.	If the auxiliary fan control board does not supply or read the tacho signal from the fan, the boiler does not detect rotation; check for the presence of speed signal (tacho/Hall) at the connector to the board and ensure the fan is rotating correctly.