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[Solved] Cyfral Smart-5P Intercom Microphone Not Working After Replacing Fermax Model

rexxodus 1038 11
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  • #1 21693748
    rexxodus
    Level 2  
    Posts: 6
    Hello,
    I replaced my old Fermax intercom with the new Cyfral Smart-5P. Everything works except the microphone. The person can't hear me.
    Do you have any idea what I'm doing wrong?

    Thanks for your advice.


    CYFRAL SMART-5P intercom circuit board with wires and buttons


    AI: Can you describe how you connected the wires from your old Fermax intercom to the new Cyfral Smart-5P? Did you follow a specific wiring diagram or color code?
    I followed the correspondence table provided by Cyfral.
    AI: Do you know what type of intercom system you have (for example, is it a 2-wire, 5-wire, or digital system)?
    I count 5 wires
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    #2 21693834
    Ircys
    Intercoms specialist  
    Posts: 6933
    Help: 1334
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    Give a photo of this old Fermax̌ uniphone including visible connections.
  • #3 21694159
    rexxodus
    Level 2  
    Posts: 6
    Hello,
    Here is the requested image. Thank you for taking the time to respond.

    FERMAX circuit board with multicolored wires and connector components
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    #4 21694434
    barrrrrman
    Level 13  
    Posts: 95
    Help: 12
    Rate: 19
    Try connecting as follows:

    Ring - 4 (red)
    SPK - 6 (violet)
    MIC - 2 (blue)
    Ground - 3 (I think it's green)
    SW1 - 1 (white)

    ZW1 and ZW2 jumpers pulled down and ZW3 put on.
  • #5 21694517
    rexxodus
    Level 2  
    Posts: 6
    Hello barman,
    This is exactly the wiring I did. :) (first picture)
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    #6 21694604
    Ircys
    Intercoms specialist  
    Posts: 6933
    Help: 1334
    Rate: 2053
    Swap red <-> purple in place
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  • #7 21695509
    rexxodus
    Level 2  
    Posts: 6
    hello,
    I swapped the cables, it doesn't work, I wonder if the old installation was correct.
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    #8 21695801
    Ircys
    Intercoms specialist  
    Posts: 6933
    Help: 1334
    Rate: 2053
    If you still have an old uniphone, plug it in and check.
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    #9 21696933
    barrrrrman
    Level 13  
    Posts: 95
    Help: 12
    Rate: 19
    You can also check with your neighbour whether he has the same colour wires connected.
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    #10 21697852
    dawidoo2115
    Level 13  
    Posts: 100
    Help: 6
    Rate: 27
    Maybe you just happened to come across a faulty unit? Sometimes this happens with new products.
  • #11 21722567
    rexxodus
    Level 2  
    Posts: 6
    See resolution below-
  • #12 21722569
    rexxodus
    Level 2  
    Posts: 6
    An electrician came by and the device was indeed defective! Thanks for your help, and sorry to have wasted your time.
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Topic summary

✨ A user replaced an old Fermax intercom with a Cyfral Smart-5P model. While the system functions overall, the microphone on the new Cyfral unit does not transmit audio, preventing the person on the other end from hearing the user. The user followed Cyfral's wiring correspondence table and confirmed the system uses five wires. A request was made for a photo of the old Fermax uniphone with visible wiring connections, which the user provided to assist in diagnosing the microphone issue.
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FAQ

TL;DR: One out of one cases here ended with a defective Smart‑5P; “the device was indeed defective!” Check wiring/jumpers first, then test the old handset, and replace if mic stays silent. [Elektroda, rexxodus, post #21722569]

Why it matters: This FAQ helps apartment owners troubleshoot a silent microphone after swapping a Fermax for a Cyfral Smart‑5P.

Quick Facts

How do I fix a Cyfral Smart‑5P mic that doesn’t work after replacing a Fermax?

Start by applying the shared wiring map and jumper positions. Then test call audio both ways. If still silent, proceed:
  1. Verify Ring, SPK, MIC, GND, and SW1 connections match the map.
  2. Set ZW1 and ZW2 down; set ZW3 on.
  3. Retest; if no change, continue with handset checks. [Elektroda, barrrrrman, post #21694434]

What wiring map worked for Fermax to Cyfral Smart‑5P in this thread?

Use this mapping: Ring to terminal 4 (red), SPK to 6 (violet), MIC to 2 (blue), Ground to 3 (green), SW1 to 1 (white). Tighten screws and retest audio. [Elektroda, barrrrrman, post #21694434]

Do I need to change jumper settings on the Smart‑5P for Fermax replacements?

Yes. Set ZW1 and ZW2 to the lower position and fit ZW3. This pairing produced working audio paths in the shared guidance. Recheck after every change. [Elektroda, barrrrrman, post #21694434]

I swapped Ring and SPK and the mic still fails—what next?

A commenter suggested swapping the red and purple positions to test signaling paths. If swapping does not restore the microphone, revert to the recommended map and continue diagnostics like handset testing. “Swap red <-> purple in place.” [Elektroda, Ircys, post #21694604]

How can I quickly confirm whether my previous wiring was correct?

Reconnect the old Fermax handset if you still have it. Place a test call to verify talkback. If the old unit works, the issue is likely with the new handset or its setup. This isolates cabling and riser wiring from the fault. [Elektroda, Ircys, post #21695801]

What did people mean by “uniphone” here?

They used “uniphone” to mean the apartment’s intercom handset. A participant asked for a photo of the old Fermax uniphone with visible connections to analyze terminal assignments. Provide clear images when seeking help. [Elektroda, Ircys, post #21693834]

How many wires are typical in the setup discussed?

In this thread, the installer reported five conductors present. That aligns with common analog handsets that separate mic, speaker, call, ground, and switch lines. “I count 5 wires.” [Elektroda, rexxodus, post #21693748]

Could a brand‑new Smart‑5P be faulty out of the box?

Yes. The reported case ended with a confirmed defective handset. As the user put it, “the device was indeed defective!” If wiring and jumpers check out, request a replacement under warranty. This is an important edge case to consider. [Elektroda, rexxodus, post #21722569]

What quick neighbor check can I do before calling an electrician?

Ask a neighbor with the same system which wire colors go to their handset terminals. Compare your Ring, SPK, MIC, GND, and SW1 connections. Color parity can quickly reveal miswires or swapped pairs. Photograph both for reference. [Elektroda, barrrrrman, post #21696933]

How do I prove the fault is the handset and not the building wiring?

If the old Fermax works and the Smart‑5P still has no mic after correct mapping and jumpers, the handset is suspect. In this thread, an electrician confirmed a defective Smart‑5P and replacement solved it. Document tests before requesting RMA. [Elektroda, rexxodus, post #21722569]

Which terminals carry the microphone and speaker in the shared map?

Microphone goes to terminal 2 (blue in the shared example). Speaker goes to terminal 6 (violet in the shared example). Ensure a solid ground on terminal 3. Then recheck call and talkback. [Elektroda, barrrrrman, post #21694434]

I followed the map and jumpers, but still no mic—what’s the final step?

Treat it as a handset failure after verifying with the old unit or a known‑good check. The case here concluded with replacing a defective Smart‑5P, restoring microphone audio immediately after swap. Seek warranty service. [Elektroda, rexxodus, post #21722569]
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