Gas Valve For Boiler ZWC 28/32-1MFA23 Ref. 8747003700
When you open the hot water tap, the Gas Valve for Boiler ZWC 28/32-1MFA23 Ref. 8747003700 from Junkers is responsible for regulating and allowing the flow of gas to the burner. If this valve fails, you will notice that the boiler does not ignite, there may be flame lockouts, or the gas modulation is incorrect, which can generate fault codes FA or d7. This valve is compatible with models from the Ceraclass Excellence, Ceraclass, Cerastar, and Eurostar ranges, among others. It is advisable to replace it when you experience these symptoms or if the boiler has constant ignition faults.
VAT included
Consult via WhatsAppJunkers 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
| Boiler model | Family | Verification |
|---|---|---|
| Junkers ZWC 24/28-1 MFA | Ceraclass Excellence / Comfort (ZWC) | Contrasted |
| Junkers ZWC 24/28-1 MFK | Ceraclass Excellence / Comfort (ZWC) | Contrasted |
| Junkers ZWC 24/28-3 MFA | Ceraclass Excellence / Comfort (ZWC) | Contrasted |
| Junkers ZWC 24/28-3 MFK | Ceraclass Excellence / Comfort (ZWC) | Contrasted |
| Junkers ZWC 24-1 MF2A | Ceraclass Excellence / Comfort (ZWC) | Contrasted |
| Junkers ZWC 24-1 MF2K | Ceraclass Excellence / Comfort (ZWC) | Contrasted |
| Junkers ZWC 28-1 MF2A | Ceraclass Excellence / Comfort (ZWC) | Contrasted |
| Junkers ZWC 28-1 MF2K | Ceraclass Excellence / Comfort (ZWC) | Contrasted |
| Junkers ZWC 28/32-1 MFA | Ceraclass Excellence / Comfort (ZWC) | Contrasted |
| Junkers ZWC 30/30-3 MFA | Ceraclass Excellence / Comfort (ZWC) | Contrasted |
| Junkers ZWC 35/35-3 MFA | Ceraclass Excellence / Comfort (ZWC) | Contrasted |
| Junkers ZSC 24-3 MFA | Ceraclass Excellence (ZSC - heating only) | Contrasted |
| Junkers ZSC 24-3 MFK | Ceraclass Excellence (ZSC - heating only) | Contrasted |
| Junkers ZSC 28-3 MFK | Ceraclass Excellence (ZSC - heating only) | Contrasted |
| Junkers ZSC 30-3 MFA | Ceraclass Excellence (ZSC - heating only) | Contrasted |
| Junkers ZSC 35-3 MFA | Ceraclass Excellence (ZSC - heating only) | Contrasted |
| Junkers ZC 24-1 MFA | Cerastar / Ceraclass (ZC - heating only) | Contrasted |
| Junkers ZC 24-1 MFK | Cerastar / Ceraclass (ZC - heating only) | Contrasted |
| Junkers ZC 24-1 MF2A | Cerastar / Ceraclass (ZC - heating only) | Contrasted |
| Junkers ZC 28-1 MFA | Cerastar / Ceraclass (ZC - heating only) | Contrasted |
| Junkers ZC 28-1 MFK | Cerastar / Ceraclass (ZC - heating only) | Contrasted |
| Junkers ZWE 23-4 A | Eurostar / Cerastar (ZWE / ZWSE) | Contrasted |
| Junkers ZWE 24-4 HA | Eurostar / Cerastar (ZWE / ZWSE) | Contrasted |
| Junkers ZWE 24-4 HK | Eurostar / Cerastar (ZWE / ZWSE) | Contrasted |
| Junkers ZWE 28-4 HA | Eurostar / Cerastar (ZWE / ZWSE) | Contrasted |
| Junkers ZWSE 23-4 MFK | Eurostar / Cerastar (ZWE / ZWSE) | Contrasted |
| Junkers ZWSE 28-4 MFA | Eurostar / Cerastar (ZWE / ZWSE) | Contrasted |
| Junkers ZWSE 28-5 MFA | Eurostar / Cerastar (ZWE / ZWSE) | Contrasted |
| Junkers ZWSE 35-6 MFA | Eurostar / Cerastar (ZWE / ZWSE) | Contrasted |
| Junkers ZWN 24-7 AE | ZWN | Contrasted |
| Junkers ZWN 24-7 KE | ZWN | 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. 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.
- 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.
- 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 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 tries to ignite, you can hear the spark click but the flame does not catch.
Cause: The gas valve does not open the flow to the burner or opens so little that the electrode does not detect the flame.
Make sure that the main gas valve is fully open and that there is no air in the system after a supply interruption.
- 02
It turns on, heats for a few seconds, and then shuts off by itself with a lockout.
Cause: The minimum flow rate allowed by the gas valve is not sufficient to maintain a stable flame, and the ionization sensor cuts off the gas for safety.
Check and clean the ionization electrode before replacing the gas valve; a dirty sensor causes the same fault.
- 03
The water always comes out at the same temperature, no matter if you open the tap a little or a lot.
Cause: The actuator that modulates the gas flow gets stuck and the gas valve stops regulating the power.
Note if the flame changes size when the water demand varies; if nothing changes, check the gas valve; if something varies, check the PCB first.
- 04
When turning on, a dry thump is heard, like a small explosion in the chamber.
Cause: The valve takes time to open and gas accumulates before the spark ignites, causing a sudden ignition instead of a gradual one.
Check the position and condition of the ignition electrode; a misaligned one delays ignition just like a slow gas valve.
Fault codes from Junkers that this part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| FA | After the gas disconnection: The flame is still detected. | The gas valve does not close tightly (leak/blockage) and the control continues to read ionisation current even though the gas has been cut off. Verify with a leak test and observe that the ionisation signal disappears when closed, and that the solenoid valve closes correctly. |
| d7 | Fault in the regulating valve. | The electronics detect a fault in the gas valve (open/shorted coils or jammed mechanism). Check control voltage and coil continuity/ohmage, and ensure the valve opens/closes by measuring pressure on the ramp. |
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
- 1 unit
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- 1-2 business days
- Return
- 14 days
Frequently asked questions about the gas valve 8747003700
Does this valve fit the boiler ZC 24-1 MFA?
Spare parts related to Junkers Ceraclass Excellence / Comfort (ZWC)
