Temperature changes should occur before HVAC actions

[richard-lott]

Checklist

• I checked for similar existing issues (both open and closed) before posting.
• I am running the latest version.

Expected behavior

In relation to controlling a thermostat. Starting state is thermostat is off and temperature is set to 20 degrees. The room temperature is 19 degrees. A scheduled change occurs to reduce the temperature to 18 degrees, and turn the thermostat to heat. My expectation is that the thermostat should change to 18 degrees and turn to heat, and not make a request for heat.

Actual behavior

In the above scenario I'm observing that my heating is turning on, for the minimum set time my thermostat allows (10m), even though the set temperature is below the actual temperature. See image:

Even though the set temperature is below the room temperature the thermostat still heats for 10 minutes - the minimum heating time.

My theory is that the hvac mode is turning to heat before the temperature changes, therefore causing the thermostat to briefly believe the temperature is below what it should be, and causing the thermostat to run for it's minimum period.

Fix would be to ensure temperature changes are made first.

Steps to Reproduce

Set thermostat set temperature to above room temperature, set thermostat to off. Set schedule to reduce temperature to below room temperature and turn the thermostat to heat. Observe when the schedule triggers.

[z-master42]

You think this is a problem of integration?

[richard-lott]

I think that the scheduler is changing the HVAC mode to heat, causing my heating to turn on, then changing the set temperature to my desired level. As the heating has already turned on, it remains on for a minimum set time.

It's just a guess as to what's happening, but I've seen it a few times now. Not sure what else could be causing it.

It feels like there needs to be some logic to control the order of actions performed, based on from and to hvac modes and set points.

Unless you have any better suggestions?

[github-actions]

This issue is stale because it has been open 30 days with no activity. Remove stale label or comment or this will be closed in 7 days

[richard-lott]

Bump. Any further comments/suggestions?

[foddy-foo]

I see this exact same situation happen to me quite often. Glad someone else has experienced it. I think the suggestion from richard-lott that the temperature should be set before the change of state to "heat" would fix this problem.

[github-actions]

This issue is stale because it has been open 30 days with no activity. Remove stale label or comment or this will be closed in 7 days