In Ontech GSM 9009/9020/9030, the alarm function must be activated for temperature alarm to work
See the manual for how to enable the alarm function in your device.
In Ontech 9025/9035/9040, temperature alarms are always activated.
To send a temperature alarm, an alarm temperature must be specified. See the respective manual for setting the alarm temperature and / or checking that it is set.

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See the manual how to enable the alarm function in your device.

In Ontech GSM 9009/9020/9030, the alarm function is turned on at startup.

In Ontech 9025/9035/9040, you must turn on the alarm function by a command.

Using Ontech Control enables the alarm function by clicking on the gray symbol under the heading “Wired alarm inputs”.

Refer to the manual how to set alarm SMS recipients for devices controlled by SMS.
For Ontech Control users, fill in the alarm receiver by selecting Menu / Alarm receiver when logged in to Ontech Control