Home Assistant Log error for Heat Index Template sensor

[simonjowett]

Hi David

I've been running through H.A and trying to resolve some log errors and come up on this one related to the Heat Index templates (when it reports 'n/a').

ValueError: Sensor sensor.heatindex has device class 'temperature', state class 'None' unit '°C' and suggested precision 'None' thus indicating it has a numeric value; however, it has the non-numeric value: 'n/a' (<class 'str'>

And also this one which is a related error:

homeassistant.exceptions.TemplateError: TypeError: '>=' not supported between instances of 'str' and 'int'

The setting of the heatindex to n/a seems incompatible with the '>=' comparitors. Maybe either setting a numeric default or skipping over the function with a "If has_value" might stop these errors?

# Heatindex
# https://en.wikipedia.org/wiki/Heat_index
      heatindex:
        unit_of_measurement: °C
        device_class: temperature
        value_template: >
            {%- if states('sensor.nowra_temp') | float(default=0) > 27 and states('sensor.nowra_humidity') | float(default=0) > 40 -%}
            {% set T = states('sensor.nowra_temp') | float(default='n/a') %}
            {% set R = states('sensor.nowra_humidity') | float(default='n/a') %}
            {% set c1 = -8.78469475556 %}
            {% set c2 = 1.61139411 %}
            {% set c3 = 2.33854883889 %}
            {% set c4 = -0.14611605 %}
            {% set c5 = -0.012308094 %}
            {% set c6 = -0.0164248277778 %}
            {% set c7 = 0.002211732 %}
            {% set c8 = 0.00072546 %}
            {% set c9 = -0.000003582 %}
            {% set HI = c1 + (c2 * T ) + (c3 * R) + ( c4 * T * R ) + ( c5 * T**2 ) + ( c6 * R**2 ) + ( c7 * T**2 * R ) + ( c8 * T * R**2 ) + ( c9 * T**2 * R**2 ) %} 
            {{ HI | round }}
            {%- else -%}
            n/a
            {%- endif -%}
      heatindexrating:
        value_template: >
            {%- if states('sensor.heatindex') == 'n/a' -%}
            Out of range
            {%- elif states('sensor.heatindex') | float(default='n/a')  >= 54 -%}
            Extreme danger: heat stroke imminent
            {%- elif states('sensor.heatindex') | float(default='n/a')  >= 41 -%}
            Danger: cramps, exhaustion heat stroke probable
            {%- elif states('sensor.heatindex') | float(default='n/a')  >= 32 -%}
            Extreme caution: cramps and exhaustion possible
            {%- elif states('sensor.heatindex') | float(default='n/a')  >= 26 -%}
            Caution: fatigue possible
            {%- else -%}
            Normal
            {%- endif -%}

[DavidFW1960]

Yeah I have been seeing this for a while and have been ignoring it. Feel free to make a PR or suggest code to change it

[simonjowett]

I was finding it difficult to see the wood for the trees in the error log so I went looking for solutions and have managed to cull them back a bit!
It seems a recent HA update has caused a number of template sensor issues and this you-tuber provided a couple of solutions.
https://www.youtube.com/watch?v=7349L0CFi-M&t=713s

My crude way is to set a dummy numeric value of 0. This seems to work to get rid of the error but leaves the heat index as =0 when it would have been 'n/a'.

Also, doing this I don't think it would ever hit the 'Normal' tag... but then whats the difference between Normal and n/a!

# Heatindex
# https://en.wikipedia.org/wiki/Heat_index
      heatindex:
        unit_of_measurement: °C
        device_class: temperature
        value_template: >
            {%- if states('sensor.nowra_temp') | float(default=0) > 27 and states('sensor.nowra_humidity') | float(default=0) > 40 -%}
            {% set T = states('sensor.nowra_temp') | float(default='n/a') %}
            {% set R = states('sensor.nowra_humidity') | float(default='n/a') %}
            {% set c1 = -8.78469475556 %}
            {% set c2 = 1.61139411 %}
            {% set c3 = 2.33854883889 %}
            {% set c4 = -0.14611605 %}
            {% set c5 = -0.012308094 %}
            {% set c6 = -0.0164248277778 %}
            {% set c7 = 0.002211732 %}
            {% set c8 = 0.00072546 %}
            {% set c9 = -0.000003582 %}
            {% set HI = c1 + (c2 * T ) + (c3 * R) + ( c4 * T * R ) + ( c5 * T**2 ) + ( c6 * R**2 ) + ( c7 * T**2 * R ) + ( c8 * T * R**2 ) + ( c9 * T**2 * R**2 ) %} 
            {{ HI | round }}
            {%- else -%}
            0
            {%- endif -%}
      heatindexrating:
        value_template: >
            {%- if states('sensor.heatindex') == '0' -%}
            Out of range
            {%- elif states('sensor.heatindex') | float(default='n/a')  >= 54 -%}
            Extreme danger: heat stroke imminent
            {%- elif states('sensor.heatindex') | float(default='n/a')  >= 41 -%}
            Danger: cramps, exhaustion heat stroke probable
            {%- elif states('sensor.heatindex') | float(default='n/a')  >= 32 -%}
            Extreme caution: cramps and exhaustion possible
            {%- elif states('sensor.heatindex') | float(default='n/a')  >= 26 -%}
            Caution: fatigue possible
            {%- else -%}
            Normal
            {%- endif -%}