add sensor with 'fault' property to dmaker.derh.22ht and dmaker.derh.50l

[damex]

fault property can tell if compressor is at fault
or if water tank is full.
reporting about water tank in dehumifier being full is
almost mandatory when you have smart dehumidifier.

[al-one]

I do not recommend specifying such a high update frequency for all dehumidifiers, as it may not be suitable for everyone. Perhaps you can customize your device through configuration.yaml.

xiaomi_miot:
  device_customizes:
    your.derh.model:
      chunk_coordinators:
        - {interval: 5, props: fault}
        - {interval: 20, props: on,mode,target_humidity,fan_level}
        - {interval: 25, props: relative_humidity,temperature}
        - {interval: 300, props: filter_life_level,filter_left_time,filter_used_time}

[damex]

I do not recommend specifying such a high update frequency for all dehumidifiers, as it may not be suitable for everyone.

please check again which property gets such high update frequency.
that's a failure (!) notification which actually should be done with a service/entity listening to its changes it but it is not possible here.

it could be catastrophic if if compressor fails or some other failure happens and person wouldn't know that it happened until minutes or hours later.

i already customized my devices and thought it is a good idea to provide same solution for everybody else.

[al-one]

1. Not all dehumidifiers have a fault property.
2. Not all dehumidifiers' fault property can reflect compressor/water tank issues.

You should add this customization for specific device model rather than *.derh.*.

[damex]

i have here dmaker.derh.22ht and dmaker.derh.50l dehumidifiers.
added sensor with 'fault' property instead of specifying that property for all dehumidifiers.