Air Pressure Switch Junkers Ceraclass Excellence ZWC 35 35 3 MFA Ref. 8716761611
The Junkers Ceraclass Excellence ZWC 35 35 3 MFA air pressure switch is a component that controls the air pressure in the boiler. Its function is to authorize the operation of the boiler when the pressure is adequate. If it fails, you will notice that the boiler does not start or gets locked, even if the actual pressure is correct, potentially displaying fault codes such as C6, C4, or C1. This pressure switch is compatible with models from the Ceraclass range, such as Comfort ZWE28-5MFA23S0400, Excellence ZSC28-3MFA, and Excellence ZWC28-3MFA23S0400, among others. It should be replaced when it shows faults in its operation.
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Consult via WhatsAppJunkers boilers compatible with reference 8716761611
Pressure switch with reference 8716761611. Four confirmed compatibilities: Comfort ZWE28-5MFA23S0400 and Excellence ZSC28-3MFA.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Junkers Comfort ZWE28-5MFA23S0400 | Ceraclass | Contrasted |
| Junkers Excellence ZSC28-3MFA | Ceraclass | Contrasted |
| Junkers Excellence ZWC28-3MFA23S0400 | Ceraclass | Contrasted |
| Junkers Excellence ZWC35-3MFA2350400 | Ceraclass | 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 the ref. 8716761611 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 8716761611. 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 pressure switch 8716761611 resolves.
The pressure switch controls the air or water pressure to authorize operation. These are the typical symptoms and what to do:
Common symptoms and faults
- 01
The boiler tries to ignite but shuts off immediately, before the flame appears.
Cause: The air pressure switch needs to confirm that the fan has created the proper depression before opening the gas valve; without that signal, there is no ignition.
Check that the silicone tubes between the pressure switch and the fan are not perforated, bent, or disconnected at any end.
- 02
The fault indicator lights up and the manual indicates a fault with the air or fan.
Cause: If the pressure switch does not change state within the time expected by the control board, it considers that there is a fault in the extraction, even if the motor is functioning correctly.
Before changing it, clean or check the condensate siphon: if it is full or dry, it can affect the pressure detected by the pressure switch.
- 03
The fault is intermittent, especially on humid days or after a long time without being turned on.
Cause: Humidity can affect the pressure switch membrane and the connection tubes, causing faults that appear and disappear.
Leave the boiler open for a few minutes and check for condensation droplets inside the pipes before replacing the part.
- 04
The boiler ignites but turns off by itself a few seconds after heating or domestic hot water.
Cause: If the pressure switch loses contact during operation, it causes the same safety cut as if it had never switched on when starting.
Repeat the ignition cycle while observing the fan: if it stops or slows down just when the boiler turns off, the problem may be before the pressure switch.
Fault codes from Junkers that this part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| C6 | The differential pressure switch does not close. | The air pressure switch does not switch to closed when the fan starts (damaged membrane/microswitch or obstruction/water in hoses), so the PCB does not "see" depression. Verify by measuring the continuity of the pressure switch when starting the draft and checking the depression with a manometer at the inlets and the condition of the hoses. |
| C4 | The pressure switch does not open in the rest position. | The pressure switch contact remains stuck/closed at rest (microswitch jammed or hoses with dirt/condensate), simulating permanent flow. Check with the boiler off that the contact is open, verify the pressure switch "click" and clean/relocate hoses. |
| C1 | The differential pressure switch has been activated during operation. | During operation, the pressure switch opens due to loss of vacuum or internal fault (intermittent contact), causing draft interruption. Check the continuity of the pressure switch under load and the stability of the vacuum; inspect hoses and connections to the pressure switch body. |
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 Junkers pressure switch 8716761611
- Catalogue reference
- 8716761611
- Brand
- Junkers
- Type of part
- Pressure switches
- Units in stock
- 5 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.
- maximum pressure
- 1040 Pa
Manuals and technical documentation
Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.
- Junkers Excellence ZWC35-3MFA2350400 manual (PDF)Document © Junkers, provided as a technical reference.
Frequently asked questions about the pressure switch 8716761611
Is this pressure switch suitable for a Junkers Ceraclass Excellence ZSC28-3MFA?
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