Gas Valve Junkers Novastar ZW20 1AME23 Ref. 8707011535
The Junkers Novastar ZW20 boilers use the Junkers Novastar ZW20 gas valve 1AME23 Ref. 8707011535. This valve regulates and allows the flow of gas to the burner according to the commands from the control board. When it fails, the boiler may not ignite, experience flame lockouts, or incorrectly modulate the power. It is compatible with models such as the ZW20-1AME and ZW20-2AME, among others. It is recommended to replace it if you experience these symptoms to avoid further issues.
VAT included
Consult via WhatsAppJunkers boilers compatible with reference 8707011535
Gas valve with reference 8707011535. Three confirmed compatibilities: ZW20-1AME (ZW20-1 AME 31 S2805) and ZW20-2AME (Novatherm).
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Junkers ZW20-1AME (ZW20-1 AME 31 S2805) | Junkers | Contrasted |
| Junkers ZW20-2AME (Novatherm) | Junkers | Contrasted |
| Junkers 80IC FSP GB (Novatherm) 7713244852 | Worcester | Contrasted |
Can't see your model or have questions? The printed reference takes precedence. How to check it · Send us a photo via WhatsApp.
How to check if ref. 8707011535 is the part for your boiler
What determines it is not the boiler model, but the reference printed on the part you already have installed.
- Find the reference printed on the installed part and check whether it matches the catalogue reference 8707011535. If it is not visible, do not identify the part from its shape alone.
- Check the full boiler model on its data plate and look for it in the model associations on this page.
- Compare the connections and physical body with the original part before installation.
- If anything is unclear, send us a photo of the marking via WhatsApp before placing your order.
Symptoms and faults that the gas valve 8707011535 resolves.
The gas valve regulates and modulates the gas flow to the burner. These are the typical symptoms and what to do:
Common symptoms and faults
- 01
The boiler tries to ignite but fails to do so, or it shuts down immediately upon starting.
Cause: The coil of the gas valve is not receiving power or is not opening, so not enough gas reaches the burner.
Measure with a multimeter that the 2-way connector is receiving power when the ignition command is given before changing the gas valve.
- 02
The burner has no flame even though the igniter can be heard when starting.
Cause: The gas block does not open the passage, although the rest of the ignition circuit works correctly.
Check that the main gas shut-off valve is open and that there is no air in the system before replacing the gas valve.
- 03
The boiler stops and shows an error related to the gas valve or lack of flame.
Cause: The control unit detects that no gas is reaching the burner and locks the boiler for safety.
Note the exact code that appears on the screen and make sure it corresponds to a gas fault, not to another component, before requesting the spare part.
- 04
A slight smell of gas is detected near the boiler when trying to ignite it.
Cause: A gas block that does not close properly can allow gas to escape at the wrong time.
Ventilate the area, turn off the main gas supply, and notify a technician; do not continue trying to ignite if you smell gas.
Fault codes from Junkers that this part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| 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. |
These symptoms can have more than one cause. If your boiler displays a fault code, send it to us via WhatsApp along with a photo of the labeling, and we'll tell you if this is the part.
Data sheet for the gas valve Junkers 8707011535
- Catalogue reference
- 8707011535
- Brand
- Junkers
- Type of part
- Gas valves
- Units in stock
- 7 units
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- Delivery time shown at checkout
- Return
- 14 days
Frequently asked questions about the gas valve 8707011535
Is this valve suitable for the Worcester 80IC FSP GB?
What fault indicates that this gas valve needs to be replaced in the Junkers ZW20-1AME?
What type of electrical connection does this valve for the Novastar ZW20 have?
Is this valve also suitable for the Junkers ZW20-2AME (Novatherm)?
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