Junkers Euromaxx Gas Valve ZWC24 MF2A 23 SIT Ref. 8747003700

Junkers boilers compatible with reference 8747003700

Gas valve with reference 8747003700. 31 verified compatibilities: ZWC 24/28-1 MFA and ZWC 24/28-1 MFK.

Proven compatibility

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. 8747003700 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.

1. Find the reference printed on the installed part and check whether it matches the catalogue reference 8747003700. If it is not visible, do not identify the part by its shape alone.
2. Check the full boiler model on its data plate and look for it in the model associations on this page.
3. Compare the connections and physical body with the original part before installation.
4. If anything is unclear, send us a photo of the marking via WhatsApp before placing your order.

Symptoms and faults that the gas valve 8747003700 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 ignites well for domestic hot water but not for heating, or vice versa.

  Cause: The valve has two independent solenoid valves (EV1 and EV2), and only one of them is failing.

  Check the exact ignition failure mode before replacing the entire gas valve; narrow down the problem for the technician.

• 02

  An electrical click is heard in the gas valve, but no flame appears.

  Cause: One of the two solenoid valves receives current but does not physically open the gas passage.

  Check that both electrical connectors of the valve are properly fitted before replacing it.

• 03

  You notice a slight smell of gas right after the boiler turns off.

  Cause: One of the solenoid valves does not close completely at the end of the cycle.

  Close the main gas valve and ventilate the area; do not force ignition until the installation has been inspected.

• 04

  The flame takes longer to appear after the ignition click, with a small jolt when it lights.

  Cause: The gas flow opens with a delay because the solenoid valve does not respond instantly to the electrical command.

  Check the voltage reaching the gas valve with the boiler running before declaring it faulty.

Fault codes from Junkers that this part resolves.

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 8747003700

Catalogue reference

8747003700

Brand

Junkers

Type of part

Gas valves

Units in stock

6 units

Status

Refurbished

Warranty

1 year

Shipping

Delivery time shown at checkout

Return

14 days

Data read on the part and in the manufacturer's documentation

What we have not been able to verify does not appear here.

Identification of solenoid valves

EV1 and EV2 (brands embedded in the brass plate, rear view)

Manuals and technical documentation

Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.

• Junkers ZWC 24/28-3 MFK manual (PDF)Document © Junkers, provided as a technical reference.