What does the code 1 Hz (1 time per sec.) mean in Junkers?

Name: Gas Valve Junkers Novastar ZW20 1AME23 Ref. 8707011535
Brand: Junkers
SKU: VGNNZW20
Price: 125 EUR
Availability: InStock

Lack of signal from the control electrode; safety time exceeded. The gas valve/solenoids do not open or are faulty, preventing gas flow and ionisation; check voltage to the coil during ignition attempt and continuity/resistance of coils, as well as gas pressure/supply.

RefurbishedJunkers Gas valves

Gas Valve Junkers Novastar ZW20 1AME23 Ref. 8707011535

125 €VAT includedIn stock · 5 units

Gas valve: reconditioned spare part that regulates and modulates the gas flow to the burner. Useful if there are ignition faults or the flame does not modulate. Reference 8707011535. 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: 8707011535
Brand: Junkers
Type of part: Gas valves
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)
1 Hz (1 time per sec.)	Lack of control electrode signal; safety time exceeded.	The gas valve/solenoids do not open or are faulty, preventing gas flow and ionisation; check voltage to the coil during the ignition attempt and continuity/resistance of coils, as well as gas pressure/supply.

Gas Valve Junkers Novastar ZW20 1AME23 Ref. 8707011535

Key Data

Spare Parts Related Boiler Novastar ZW20 1AME23