> For the complete documentation index, see [llms.txt](https://wiki.inels.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://wiki.inels.com/inels-bus/inels-design-manager-idm3/common-idm3-support-questions.md). # Common questions — support index *Support index — a symptom or question, and the chapter that answers it.* *** This page exists to get you from a customer's words to the right chapter fast. It is phrased the way people actually ask, not the way the manual is organised. *** ## "It doesn't work" | The customer says | Likely cause | Chapter | | ---------------------------------------- | ----------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------- | | The button does nothing at all | Icon not assigned — yellow dot on the floor plan | [30 §30.1](/inels-bus/inels-design-manager-idm3/troubleshooting-idm3.md) · [17 §17.4](/inels-bus/inels-design-manager-idm3/idm3-floors-and-the-design-tab.md) | | I uploaded but nothing changed | Saved the file but never did **Save to central unit** | [23](/inels-bus/inels-design-manager-idm3/connecting-and-uploading-to-the-central-unit.md) | | It worked before, now it doesn't | The CU is running a different project | [23 §23.6](/inels-bus/inels-design-manager-idm3/connecting-and-uploading-to-the-central-unit.md) | | Some devices are missing / disconnected | Addresses don't match the hardware | [16](/inels-bus/inels-design-manager-idm3/idm3-device-manager-reference.md) | | The relay clicks but the light stays off | The project is right — the fault is electrical | [26 §26.5](/inels-bus/inels-design-manager-idm3/idm3-simulation-and-monitor.md) | | Nothing responds after a power cut | Non-volatile not set; no `System start` wire | [12 §12.4](/inels-bus/inels-design-manager-idm3/tutorial-timers-counters-and-conditions.md) | ## Lights and switching | The customer says | Answer | Chapter | | ------------------------------------------------- | --------------------------------------------------------------- | ------------------------------------------------------------------------------------------- | | The button only turns the light on, never off | `Digital switch ON` isn't a toggle — use `DIGITAL_SWITCH` | [6 §1](/inels-bus/inels-design-manager-idm3/tutorial-toggles-impulses-and-delays.md) | | I want a staircase light that switches itself off | Impulse function with an impulse time | [6 §2](/inels-bus/inels-design-manager-idm3/tutorial-toggles-impulses-and-delays.md) | | Pressing again doesn't restart the timer | `Digital_Impulse_ON` ignores an output already on — use a timer | [12 §12.2](/inels-bus/inels-design-manager-idm3/tutorial-timers-counters-and-conditions.md) | | I want one button to do two things | Two actions on one wire — `Short down` and `Long down` | [6 §4](/inels-bus/inels-design-manager-idm3/tutorial-toggles-impulses-and-delays.md) | | I want a delay before it switches off | `Digital delay switch OFF` | [6 §5](/inels-bus/inels-design-manager-idm3/tutorial-toggles-impulses-and-delays.md) | | How do I switch everything off from one button | A group | [8](/inels-bus/inels-design-manager-idm3/tutorial-groups-and-scenes.md) | ## Dimming | The customer says | Answer | Chapter | | ----------------------------------------- | -------------------------------------------------------------------- | ------------------------------------------------------------------------------------------- | | The light runs to 100% after I let go | Missing `Analog stop changing level` on `Long up` | [7 §3](/inels-bus/inels-design-manager-idm3/tutorial-dimming-with-analog-functions.md) | | Holding the button doesn't dim | Needs `Analog increasing level` on `Long down` | [7 §3](/inels-bus/inels-design-manager-idm3/tutorial-dimming-with-analog-functions.md) | | The dimmer forgets its brightness | `Analog switch value` only moves 0%↔100% — needs a system integer | [12 §12.5](/inels-bus/inels-design-manager-idm3/tutorial-timers-counters-and-conditions.md) | | My 10-second ramp only takes 2 seconds | Ramp length is the **0→100%** time; partial changes are proportional | [7 §5](/inels-bus/inels-design-manager-idm3/tutorial-dimming-with-analog-functions.md) | | I want the light to fade, not jump | `Analog set level w ramp` | [7 §5](/inels-bus/inels-design-manager-idm3/tutorial-dimming-with-analog-functions.md) | | I want a specific brightness on one press | `ANALOG_SET_LEVEL_25/50/75` | [7 §4](/inels-bus/inels-design-manager-idm3/tutorial-dimming-with-analog-functions.md) | ## Blinds and shutters | The customer says | Answer | Chapter | | --------------------------------------- | -------------------------------------------------------------------- | --------------------------------------------------------------------------------------- | | How do I control blinds | Digital impulse — short time tilts, long time runs full travel | [9](/inels-bus/inels-design-manager-idm3/tutorial-blinds-and-shutters.md) | | The blind won't stop when I press again | `Digital_Impulse_ON` ignores an active output — add an explicit stop | [9 §4](/inels-bus/inels-design-manager-idm3/tutorial-blinds-and-shutters.md) | | The blind doesn't reach the end | Impulse time shorter than real travel time | [9 §5](/inels-bus/inels-design-manager-idm3/tutorial-blinds-and-shutters.md) | | The slats tilt too far | Reduce the tilt impulse time | [9 §5](/inels-bus/inels-design-manager-idm3/tutorial-blinds-and-shutters.md) | | Can blinds close at sunset | Astronomical module | [11 §11.2](/inels-bus/inels-design-manager-idm3/tutorial-time-control-and-schedules.md) | ## Heating and cooling | The customer says | Answer | Chapter | | ---------------------------------------- | ------------------------------------------ | --------------------------------------------------------------------------------- | | Heating doesn't come on | Check **Monitor → Heat/Cool areas** first | [30 §30.8](/inels-bus/inels-design-manager-idm3/troubleshooting-idm3.md) | | The temperature is wrong | The time plan, or which plan the area uses | [20 §20.6](/inels-bus/inels-design-manager-idm3/idm3-system-manager-reference.md) | | How do I set a heating schedule | Time plan, then Heat/Cool area | [10](/inels-bus/inels-design-manager-idm3/tutorial-heating-and-cooling.md) | | Heating and cooling run at the same time | **Check the difference between…** → `On` | [20 §20.7](/inels-bus/inels-design-manager-idm3/idm3-system-manager-reference.md) | | One room never heats | That room's **Heating output** | [20 §20.7](/inels-bus/inels-design-manager-idm3/idm3-system-manager-reference.md) | | No room heats | The shared **Heating supply** | [20 §20.7](/inels-bus/inels-design-manager-idm3/idm3-system-manager-reference.md) | | How do I protect against freezing | **Antifreeze temperature** on every area | [10 §10.4](/inels-bus/inels-design-manager-idm3/tutorial-heating-and-cooling.md) | | What are Favorite1–4 | The four preset temperatures | [10 §10.3](/inels-bus/inels-design-manager-idm3/tutorial-heating-and-cooling.md) | | Holiday mode for heating | Holiday plan + a continuous program | [10 §10.6](/inels-bus/inels-design-manager-idm3/tutorial-heating-and-cooling.md) | ## Timers, counters, logic | The customer says | Answer | Chapter | | ----------------------------------------- | ------------------------------------------------ | ------------------------------------------------------------------------------------------- | | Corridor light should restart on movement | A timer — `Timer start` restarts a running timer | [12 §12.2](/inels-bus/inels-design-manager-idm3/tutorial-timers-counters-and-conditions.md) | | I want to count something | A counter | [12 §12.3](/inels-bus/inels-design-manager-idm3/tutorial-timers-counters-and-conditions.md) | | How do I remember a state | A system bit, **non volatile** | [12 §12.4](/inels-bus/inels-design-manager-idm3/tutorial-timers-counters-and-conditions.md) | | Holiday mode is lost after a reboot | **non volatile** wasn't ticked | [12 §12.4](/inels-bus/inels-design-manager-idm3/tutorial-timers-counters-and-conditions.md) | | Only do this if it's dark / cold / off | A condition | [12 §12.6](/inels-bus/inels-design-manager-idm3/tutorial-timers-counters-and-conditions.md) | | What do system bits and integers do | Storage the whole project can read and write | [20 §20.4](/inels-bus/inels-design-manager-idm3/idm3-system-manager-reference.md) | ## Schedules and time | The customer says | Answer | Chapter | | ------------------------------- | ---------------------------------------- | --------------------------------------------------------------------------------------- | | Do something at a set time | A **Periodical** program | [11 §11.3](/inels-bus/inels-design-manager-idm3/tutorial-time-control-and-schedules.md) | | On for part of the week | A **Two-state** program | [11 §11.4](/inels-bus/inels-design-manager-idm3/tutorial-time-control-and-schedules.md) | | Between two dates | A **Continuous** program | [11 §11.5](/inels-bus/inels-design-manager-idm3/tutorial-time-control-and-schedules.md) | | I can't save my program | No day or month ticked | [11 §11.3](/inels-bus/inels-design-manager-idm3/tutorial-time-control-and-schedules.md) | | Sunset switching is an hour out | The CU's **Time zone** | [22 §22.2](/inels-bus/inels-design-manager-idm3/idm3-central-unit-configuration.md) | | Lights on at dusk all year | Astronomical module with a sunset offset | [11 §11.2](/inels-bus/inels-design-manager-idm3/tutorial-time-control-and-schedules.md) | ## Connection and upload | The customer says | Answer | Chapter | | ----------------------------------- | ---------------------------- | ------------------------------------------------------------------------------------------------ | | I can't connect to the central unit | **Ping test** first | [23 §23.2](/inels-bus/inels-design-manager-idm3/connecting-and-uploading-to-the-central-unit.md) | | It says BadPassword | Wrong CU password | [23 §23.3](/inels-bus/inels-design-manager-idm3/connecting-and-uploading-to-the-central-unit.md) | | It says UpdateRequired | CU firmware too old | [25](/inels-bus/inels-design-manager-idm3/idm3-firmware-update-manager.md) | | Compile error | Click the button and read it | [30 §30.3](/inels-bus/inels-design-manager-idm3/troubleshooting-idm3.md) | | I lost the project file | **Load from central unit** | [15 §15.6](/inels-bus/inels-design-manager-idm3/idm3-projects-and-files.md) | | How do I change the CU's IP address | **CU configuration** | [22 §22.2](/inels-bus/inels-design-manager-idm3/idm3-central-unit-configuration.md) | ## Groups, scenes and reuse | The customer says | Answer | Chapter | | ------------------------------------------ | --------------------------------------------------------- | --------------------------------------------------------------------------------------------- | | A light won't join my group | Wrong group type — relays and dimmers can't share one | [8 §The four group types](/inels-bus/inels-design-manager-idm3/tutorial-groups-and-scenes.md) | | How do I build a scene | Separate wires with different levels, not a group | [8 §5](/inels-bus/inels-design-manager-idm3/tutorial-groups-and-scenes.md) | | The group function names look wrong | Untranslated in 3.5.3 — `GroupDigital_SwitchOn` is normal | [8](/inels-bus/inels-design-manager-idm3/tutorial-groups-and-scenes.md) | | I keep building the same thing | Macros, or function blocks | [14](/inels-bus/inels-design-manager-idm3/tutorial-macros-and-function-blocks.md) | | My macro didn't apply | Its **Type** doesn't match the actor type | [14 §14.2](/inels-bus/inels-design-manager-idm3/tutorial-macros-and-function-blocks.md) | | Editing the macro changed nothing | Macros are copied into wires, not linked | [14 §14.2](/inels-bus/inels-design-manager-idm3/tutorial-macros-and-function-blocks.md) | | A function block does nothing | Inputs/outputs not plugged in, or **Connect** not pressed | [14 §14.3](/inels-bus/inels-design-manager-idm3/tutorial-macros-and-function-blocks.md) | | A colleague can't open my project properly | Function block templates live outside the `.elp` | [14 §14.3](/inels-bus/inels-design-manager-idm3/tutorial-macros-and-function-blocks.md) | ## Hotel installations | The customer says | Answer | Chapter | | ----------------------------------------------- | ------------------------------------------------------ | --------------------------------------------------------------------- | | Rooms don't show up in iNELS Harmony | No Hotel-Room object — Harmony discovers rooms from it | [34 §34.1](/inels-bus/inels-design-manager-idm3/hotel-room-object.md) | | What is the Hotel-Room object for | One object per guest room: status, climate, scenes | [34 §34.1](/inels-bus/inels-design-manager-idm3/hotel-room-object.md) | | Where do I enter the room number | **Room-Id** on the Hotel-Room unit — not the Address | [34 §34.3](/inels-bus/inels-design-manager-idm3/hotel-room-object.md) | | Guest can set a temperature but nothing happens | Heat/Cool area outputs never wired to hardware | [34 §34.5](/inels-bus/inels-design-manager-idm3/hotel-room-object.md) | | How does the PMS read a room | One MQTT topic pair per room | [34 §34.8](/inels-bus/inels-design-manager-idm3/hotel-room-object.md) | | DND light doesn't match the button | Drive the backlight from the DND datapoint | [34 §34.6](/inels-bus/inels-design-manager-idm3/hotel-room-object.md) | | Empty rooms stay warm | Wire Occupancy off → setback | [34 §34.7](/inels-bus/inels-design-manager-idm3/hotel-room-object.md) | ## Integration | The customer says | Answer | Chapter | | ----------------------------------------- | ---------------------------------------------- | --------------------------------------------------------------------------------------------------- | | Can I use it with Home Assistant | MQTT | [24 §24.4](/inels-bus/inels-design-manager-idm3/idm3-external-systems-mqtt-modbus-cloud.md) | | MQTT isn't working | Needs CU firmware `02.97.02` or later | [24 §24.4](/inels-bus/inels-design-manager-idm3/idm3-external-systems-mqtt-modbus-cloud.md) | | Can I read an energy meter | Modbus master | [32 §32.5](/inels-bus/inels-design-manager-idm3/idm3-modbus-rtu-and-ip-integration.md) | | Can a BMS read the installation | Modbus slave | [32 §32.7](/inels-bus/inels-design-manager-idm3/idm3-modbus-rtu-and-ip-integration.md) | | Does it do Modbus RTU or just TCP | Both — but **RTU needs a CU3-10M** | [32 §32.3](/inels-bus/inels-design-manager-idm3/idm3-modbus-rtu-and-ip-integration.md) | | Internal-Modbus-Master isn't in the list | The CU isn't a CU3-10M | [32 §32.3](/inels-bus/inels-design-manager-idm3/idm3-modbus-rtu-and-ip-integration.md) | | RTU meter, but the site has a CU3-08M | Gateway, CU swap, or GRT3-100 master | [32 §32.3](/inels-bus/inels-design-manager-idm3/idm3-modbus-rtu-and-ip-integration.md) | | Which CU do I need for Modbus | IP: any. RTU: CU3-10M only. | [32 §32.3](/inels-bus/inels-design-manager-idm3/idm3-modbus-rtu-and-ip-integration.md) | | Can two central units talk to each other | Yes — Modbus IP | [33](/inels-bus/inels-design-manager-idm3/linking-two-inels-central-units-over-modbus-ip.md) | | Button on one CU, light on another | Link them over Modbus IP | [33](/inels-bus/inels-design-manager-idm3/linking-two-inels-central-units-over-modbus-ip.md) | | CU link worked, then stopped | The slave CU's IP changed — DHCP | [33 §33.8](/inels-bus/inels-design-manager-idm3/linking-two-inels-central-units-over-modbus-ip.md) | | Value moves on one CU, not the other | Register address, data type or scaling differs | [33 §33.8](/inels-bus/inels-design-manager-idm3/linking-two-inels-central-units-over-modbus-ip.md) | | How do I share a temperature between CUs | One register, `Multiplication 10x` both sides | [33 §33.10](/inels-bus/inels-design-manager-idm3/linking-two-inels-central-units-over-modbus-ip.md) | | Modbus reads nothing at all | A/B swapped, wrong baud, wrong slave address | [32 §32.10](/inels-bus/inels-design-manager-idm3/idm3-modbus-rtu-and-ip-integration.md) | | Modbus works with 2 devices, fails with 5 | Termination or topology | [32 §32.4](/inels-bus/inels-design-manager-idm3/idm3-modbus-rtu-and-ip-integration.md) | | Temperature reads 215 instead of 21.5 | Scaling — set the multiplication factor | [32 §32.10](/inels-bus/inels-design-manager-idm3/idm3-modbus-rtu-and-ip-integration.md) | | Every Modbus value is one register out | Register number vs offset (40001 vs 0x0000) | [32 §32.5](/inels-bus/inels-design-manager-idm3/idm3-modbus-rtu-and-ip-integration.md) | | Can I control a Carrier air conditioner | Yes, via a CCN→Modbus translator | [32 §32.8](/inels-bus/inels-design-manager-idm3/idm3-modbus-rtu-and-ip-integration.md) | | The external system can't see a device | It isn't marked **Add to iNELS 3 export** | [24 §24.2](/inels-bus/inels-design-manager-idm3/idm3-external-systems-mqtt-modbus-cloud.md) | | A phone app for the client | Cloud | [22 §22.3](/inels-bus/inels-design-manager-idm3/idm3-central-unit-configuration.md) | ## DALI | The customer says | Answer | Chapter | | --------------------------------------------- | --------------------------------------------- | ------------------------------------------------------------------------------- | | How do I address DALI ballasts | CU3-09M: Dali manager. RC3-610M: externally. | [21 §21.1](/inels-bus/inels-design-manager-idm3/idm3-dali-manager-reference.md) | | Which CU do I need for DALI | **CU3-09M** — or an RC3-610M/DALI unit | [21 §21.1](/inels-bus/inels-design-manager-idm3/idm3-dali-manager-reference.md) | | Dali manager doesn't see my ballasts | The CU isn't a CU3-09M | [21 §21.1](/inels-bus/inels-design-manager-idm3/idm3-dali-manager-reference.md) | | RC3-610M DALI lights don't respond | Ballasts must be addressed externally first | [21 §21.6](/inels-bus/inels-design-manager-idm3/idm3-dali-manager-reference.md) | | DALI bus completely dead | DALI needs its own power supply | [21 §21.1](/inels-bus/inels-design-manager-idm3/idm3-dali-manager-reference.md) | | All my DALI lights control the wrong fittings | Someone ran **New DALI** on a live system | [21 §21.3](/inels-bus/inels-design-manager-idm3/idm3-dali-manager-reference.md) | | Which fitting has failed | **Lamp failure** in the Dali manager status | [21 §21.5](/inels-bus/inels-design-manager-idm3/idm3-dali-manager-reference.md) | | Duplicate DALI address | Red exclamation mark — use **Delete address** | [21 §21.4](/inels-bus/inels-design-manager-idm3/idm3-dali-manager-reference.md) | ## Messaging | The customer says | Answer | Chapter | | ------------------------------------------ | -------------------------------------- | ------------------------------------------------------------------------------------- | | SMS never arrives | The **GSM:** plug is red, not green | [13 §13.4](/inels-bus/inels-design-manager-idm3/tutorial-alarms-and-sms-messaging.md) | | Can it text me when something happens | Yes — GSM3-01M required | [13](/inels-bus/inels-design-manager-idm3/tutorial-alarms-and-sms-messaging.md) | | My text to the system does nothing lasting | Incoming SMS is a **one-second** pulse | [13 §13.4](/inels-bus/inels-design-manager-idm3/tutorial-alarms-and-sms-messaging.md) | | Message got cut off | 32-character limit | [19 §19.6](/inels-bus/inels-design-manager-idm3/idm3-managers-reference.md) | ## Software and versions | The customer says | Answer | Chapter | | ----------------------------------------------------- | ------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------- | | Where do I download iDM3 | [Software Download](https://wiki.inels.com/inels-bus/inels-design-manager-idm3/software-download) | [3](/inels-bus/inels-design-manager-idm3/installing-idm3-and-first-run.md) | | Which central units are supported | CU3-08M / 09M / 10M; CU3-07M obsolete | [1 §1.2](/inels-bus/inels-design-manager-idm3/what-inels3-and-idm3-are.md) | | Is EST3 / EHT3 still available | Obsolete — use a GSB3 or similar | [Appendix D](/inels-bus/inels-design-manager-idm3/idm3-supported-units.md) | | What's the difference between Short down and Short up | Down = press, up = release | [2 §2.2](/inels-bus/inels-design-manager-idm3/how-programming-works-in-idm3.md) | | Why does it say "for CU3-07M" | Historical naming | [3 §3.2](/inels-bus/inels-design-manager-idm3/installing-idm3-and-first-run.md) | | My old project won't open properly | Needs conversion — **and a connection to the CU** | [28](/inels-bus/inels-design-manager-idm3/opening-older-idm3-projects.md) | | A unit isn't supported any more | **Unavailable units** | [28 §28.4](/inels-bus/inels-design-manager-idm3/opening-older-idm3-projects.md) | | iDM3 won't start | .NET Framework 4.8; check `Exception.excp` | [3 §3.7](/inels-bus/inels-design-manager-idm3/installing-idm3-and-first-run.md) | | Where are the log files | The install folder | [30 §30.6](/inels-bus/inels-design-manager-idm3/troubleshooting-idm3.md) | | It's very slow | Turn off the two animations | [30 §30.6](/inels-bus/inels-design-manager-idm3/troubleshooting-idm3.md) | | I've run out of wires / bits | **Prefernces** shows the limits | [27 §27.3](/inels-bus/inels-design-manager-idm3/idm3-settings-and-preferences.md) | *** ## Things that look like bugs but aren't Worth checking before escalating — each is documented behaviour: | Behaviour | Why | | --------------------------------------------- | ------------------------------------------------- | | Second press does nothing | `Digital switch ON` is not a toggle | | Impulse won't re-trigger | `Digital_Impulse_ON` ignores an output already on | | Light climbs to full after dimming | No `Analog stop changing level` on `Long up` | | Ramp finishes early | Ramp length is the 0→100% time | | Group function names look raw | Untranslated in 3.5.3 | | `Alarm_Refeshed` is misspelled | It is — in the software | | Menu says "Prefernces" | It does | | **New unit** greyed out | Wrong item selected, or a limit reached | | Editing a macro doesn't change existing wires | Macros are copied, not linked | *** **See also:** [Chapter 30 — Troubleshooting](/inels-bus/inels-design-manager-idm3/troubleshooting-idm3.md) · [Appendix E — Glossary](/inels-bus/inels-design-manager-idm3/idm3-glossary.md) · [index](/inels-bus/inels-design-manager-idm3/idm3-user-manual-contents.md)