Monitor freezer

I am looking for a way to monitor our freezer. This morning the 5th time over the last years I discovered that someone in our house did not close the freezer correctly one or two days before. So I had to throw away almost everything … I am looking for a solution to monitor the freezer. Unfortunately It only has a red status LED “!” - nor sirene. The most obviouds way, using am door/window sensor does not seem to be the right way. The door is open only for one mm. Enough for sucking in warm air from outside…
So monitoring this Led could be a solution, but how? I also thought of monitoring the power consumption. Any suggestion how to do this? Or any other suggestions? For wireless compontenes I have running z-wave, zigbee, and Homematic.

I use a power monitoring smart plug. If the compressor runs (power > x) for longer than y minutes send a notification. Also if the compressor has been off for longer than z minutes send a notification (it usually runs a few times an hour).

One final automation: if the switch is turned off, turn it on again immediately. It’s hidden from the dashboard and is set to come on after power failure so this is just a safeguard.

Sound´s great. I have running Tasmota, Shelly and Fibaro Smart Plug´s. The Tasmota´s currently are not willing to talk via MQTT… but the Shelly´s and the Fibaro´s are working fine.
How have your realised the rules / coding? I am not that familiar with writing code… I can read and understand most of it and can adddept it… I have done some work in node red.
For saving and visualising of some data I have first experiences with influx and grafana…

It’s just a numeric state trigger.

trigger:
  - platform: numeric_state
    entity_id: sensor.your_power_sensor
    above: 10 # or whatever value is good to detect the compressor running
    for:
      minutes: 30 # make this longer than the maximum run time you normally see
action:
  - service: notify...etc

Likewise for the hasn’t run for ages alert:

trigger:
  - platform: numeric_state
    entity_id: sensor.your_power_sensor
    below: 10 # or whatever value is good to detect the compressor not running
    for:
      hours: 3 # make this longer than the maximum gap between compressor runs you normally see
action:
  - service: notify...etc

I do use these sensor putting in the freezer:
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And check on temp > then your minimum
Works perfect for me

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I did use a door switch for this, when open for more, than 2 minutes, every mobile device of the family get’s a notification.

Last months with our new freezer i use the same timing, but the door switch is already a part of the LG freezer with WiFi, using the SmartThinkQ HACS integration.

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Here is the automation i use now:

alias: Koelkast deur te lang open
description: ''
trigger:
  - type: opened
    platform: device
    device_id: 63b33aef118b11eb9281afb567acd2c3
    entity_id: binary_sensor.koelkast_door_open
    domain: binary_sensor
    for:
      hours: 0
      minutes: 2
      seconds: 0
condition: []
action:
  - service: notify.mobile_app_mischa_op6t
    data:
      message: 'Hallo, de koelkast staat nog open. Wil je even kijken?'
  - service: notify.mobile_app_in2013
    data:
      message: 'Hallo, de koelkast staat nog open. Wil je even kijken?'
mode: single

Could you tell how long the battery will last?

I do have 2 freezers and 2 fridges.
The minimum is half a year. I do have some longer then a year.
One is over 1,5 years already
The battery level is dropping to about 40% in a couple of weeks but stays there for at least half a year.
I was supprised about the duration myself

That’s awesome, going to move one of the sensors to my freezer!