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[Solved] ACO INS UP 720 v2 without sound - checking the cables and the control unit

Gomez1981 14304 12
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  • #1 18815135
    Gomez1981
    Level 5  
    Posts: 5
    Rate: 4
    Hello
    First of all, I know that there have already been topics about this intercom, but none of the solutions helped me, so... I`m asking for help.
    My ACO Ins-UP 720 v2 intercom stopped working (it is deaf). I checked the voltage on the cable with a multimeter and it is 9V. The earpiece is deaf, there is no crackling sound when pressing the OPEN button. The cable connection is correct. The switchboard is made by ACO.
    Is there a possibility of a short circuit on the cable? I would also like to mention that I had the door frames next to the intercom replaced. However, I don`t want to forge if I don`t have to (as I wrote above, the voltage is 9 V). I also checked the handset from the same intercom from a neighbor and nothing... :cry:
    Attached is a photo of the intercom.
    Help !!! ACO INS UP 720 v2 without sound - checking the cables and the control unit
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  • #2 18815143
    sosarek

    Level 43  
    Posts: 83875
    Help: 9318
    Rate: 15431
    Gomez1981 wrote:
    I also checked the handset from the same intercom from a neighbor and nothing...

    Well, did you change her address or called your neighbor`s number?
    Company Account:
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    Pka, Poznań, 60-850
    Helpful post? Buy me a coffee.
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  • #3 18815170
    Gomez1981
    Level 5  
    Posts: 5
    Rate: 4
    My neighbor`s handset works, his handset doesn`t work in mine... I didn`t program anything.
  • #4 18815176
    clouddancer
    Level 16  
    Posts: 116
    Help: 22
    Rate: 28
    Gomez1981 wrote:
    My neighbor`s handset works, his handset doesn`t work in mine... I didn`t program anything.


    Well, that`s the end of the search. I had exactly the same problem, they cut the cable when replacing the door. I didn`t bother with forging, I just changed the location of the uniphone, so that the new cable could run a short distance on top.
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  • #5 18815325
    Gomez1981
    Level 5  
    Posts: 5
    Rate: 4
    Well, the question is, if the cable was kinked, would I still have 9V on the wire? It is flexible and when I move it there are no voltage spikes (switches)....
  • Helpful post
    #6 18815444
    Ircys
    Intercoms specialist  
    Posts: 6933
    Help: 1334
    Rate: 2053
    Gomez1981 wrote:
    Well, the question is, if the cable was kinked, would I still have 9V on the wire? It is flexible and when I move it there are no voltage spikes (switches)....


    If there is voltage on the line, the cable is OK.

    In these uniphones, the switch most often fails, so 95% of the time this is the cause of the fault.

    Regards
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  • #7 18815478
    Gomez1981
    Level 5  
    Posts: 5
    Rate: 4
    So the plan now is to order a new system and replace it. When it arrives, I will check and let you know. Keep fingers crossed ;)
  • #8 18816013
    ROWE
    Level 34  
    Posts: 1987
    Help: 239
    Rate: 529
    INS-UP720B has a 3-step ringing volume control switch.
    The switch used there does not tolerate excessive dust that appears, for example, during renovations, and this also applies to the switch.

    It is worth cleaning it first, using gasoline or spirit (no WD 40!), and only then replacing it if necessary.
  • #9 18816048
    Ircys
    Intercoms specialist  
    Posts: 6933
    Help: 1334
    Rate: 2053
    ROWE wrote:
    INS-UP720B has a 3-step ringing volume control switch.
    The switch used there does not tolerate excessive dust that appears, for example, during renovations, and this also applies to the switch.

    It is worth cleaning it first, using gasoline or spirit (no WD 40!), and only then replacing it if necessary.


    A beautiful theory, but unfortunately it does not work in the case of ACO uniphones.
    ACO "digests" the virus of Chinese switches, which simply fall apart structurally (springs, plastic) and here dust, dust, etc., external factors have no influence on it. If you have any doubts, ask the source.

    Regards
  • #11 18816120
    suworow
    VIP Meritorious for electroda.pl  
    Posts: 8802
    Help: 650
    Rate: 1273
    Whose practice? Probably not yours? If my friend had one, he would know that the switches in these uniphones are a real curse and the most likely cause of the fault. :)
    Regards
  • #12 18817716
    ROWE
    Level 34  
    Posts: 1987
    Help: 239
    Rate: 529
    No comment.
  • #13 18820264
    Gomez1981
    Level 5  
    Posts: 5
    Rate: 4
    The exchange was helpful. Works !
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Topic summary

✨ The ACO Ins-UP 720 v2 intercom is experiencing a complete loss of sound, despite a measured voltage of 9V on the cable. The user has confirmed correct cable connections and tested a neighbor's handset, which works, indicating the issue lies within their unit. Suggestions from the forum include checking for potential cable damage due to recent door frame replacements, as well as the possibility of a faulty switch, which is a common failure point in these devices. One user successfully resolved a similar issue by relocating the intercom to avoid damaged wiring. Cleaning the switch was also recommended, but some users noted that the switches in ACO uniphones are prone to structural failure. Ultimately, the user decided to replace the intercom system, which resolved the issue.
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FAQ

TL;DR: 95% of “deaf” ACO INS‑UP 720 v2 faults are the internal switch; “the switch most often fails.” Check bus voltage, then clean or replace the handset/switch. [Elektroda, Ircys, post #18815444] Why it matters: This helps ACO INS‑UP 720/720B owners and installers fix no‑sound issues fast without needless wall chiseling or control‑unit swaps.

Quick Facts

What’s the most likely cause when an ACO INS‑UP 720 v2 is silent?

A failing internal switch is the top cause. One installer estimated it at 95% of cases. “The switch most often fails.” If bus voltage is present, focus on the handset and its switch rather than the cable. Replace or service the uniphone first. [Elektroda, Ircys, post #18815444]

I measure voltage on the line—could the cable still be cut?

Unlikely. If you can read voltage on the line with a multimeter, treat the cable as intact. “If there is voltage on the line, the cable is OK.” Shift your attention to the uniphone’s internal switch and electronics. [Elektroda, Ircys, post #18815444]

Does renovation dust affect the ring‑volume switch, and how should I clean it?

Users report the INS‑UP720B ring‑volume slider dislikes dust. Clean the switch using gasoline or spirit and cycle it several times. Avoid water‑displacing sprays. “No WD 40!” Replace the switch only if cleaning fails to restore ringing. [Elektroda, ROWE, post #18816013]

How do I quickly diagnose a ‘deaf’ INS‑UP 720 v2?

Use this 3‑step check:
  1. Measure bus line voltage with a multimeter.
  2. If voltage exists, inspect or bypass the handset’s internal switch.
  3. If the switch is faulty, replace the uniphone to restore audio. [Elektroda, Ircys, post #18815444]

When swapping in a neighbor’s handset, do I need to change its address?

Yes. Digital ACO handsets must be addressed to your flat to respond. Either change the test handset’s address or call the neighbor’s number during checks. As one reply asked, “did you change her address or called your neighbor’s number?” [Elektroda, sosarek, post #18815143]

My earpiece is silent and pressing OPEN makes no noise—what does that point to?

With line voltage present yet no audio or OPEN crackle, suspect the handset’s internal switch or board. Cable faults are unlikely when voltage is on the line. Replace or service the uniphone before chasing wiring. [Elektroda, Ircys, post #18815444]

Could replacing door frames have damaged my intercom cable, and how do I avoid chiseling?

Yes, cables can be damaged during door work. One user avoided wall forging by relocating the uniphone and running a short surface cable. This restored function without chiseling the wall. [Elektroda, clouddancer, post #18815176]

Are ACO INS‑UP uniphone switches a known weak point?

Yes. An experienced member called the switches “a real curse” and the most likely fault source. Prioritize switch checks early. [Elektroda, suworow, post #18816120]

Is the failure due to dust or poor switch build quality?

One installer reported structural switch failures (springs, plastic) unrelated to dust. In his words, “Chinese switches… simply fall apart structurally.” If cleaning doesn’t help, expect to replace the switch or the whole handset. [Elektroda, Ircys, post #18816048]

Will replacing the uniphone fix the issue if cleaning doesn’t help?

Yes. The thread author confirms a full handset replacement restored operation. Swapping the unit can be faster than chasing intermittent switch faults. [Elektroda, Gomez1981, post #18820264]

Is the building control unit the culprit when one flat is silent?

Usually not. In this case, replacing the local uniphone solved the problem, indicating a handset‑side fault rather than the ACO switchboard. Check the handset first. [Elektroda, Gomez1981, post #18820264]

I tested a neighbor’s handset and it didn’t work in my flat—what went wrong?

It likely wasn’t addressed to your flat. The poster noted they “didn’t program anything,” and the borrowed handset didn’t respond. Program the address or test by calling the correct number. [Elektroda, Gomez1981, post #18815170]
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