What does the fault code F0 mean in Junkers?

Name: Junkers Eurostar ACU HIT PCB Ref. 8748300344
Brand: Junkers
SKU: PLCACUH
Price: 125 EUR
Availability: InStock

Internal fault / printed circuit fault. Defect in the PCB (Heatronic/PCB) causing internal control failure; check power supply and connections/plugs, and if the wiring and BUS module are correct but the F0 persists, replace the PCB.

RefurbishedJunkers PCBs (control boards)

Junkers Eurostar ACU HIT PCB Ref. 8748300344

125 €VAT includedIn stock · 4 units

PCB (control board): refurbished spare part that controls the ignition, modulation, and safety features of the boiler. Useful if the boiler does not ignite, locks out, or the display is unresponsive. Reference 8748300344. 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

Technical support

Key Data

Reference: 8748300344
Brand: Junkers
Type of part: PCBs (control boards)
Available units: 4 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)
F0	Internal fault / PCB fault.	Defect in the PCB (Heatronic/PCB) causing internal control fault; check power supply and connections/plugs, and if the wiring and BUS module are correct but the F0 persists, replace the PCB.

Junkers Eurostar ACU HIT PCB Ref. 8748300344

Key Data

Eurostar ACU HIT Boiler Related Spare Parts