I have a setup of 6 thermostats to control a floor heating system and one electric heater. All of a sudden the electric heater thermostat has started to behave very strange. It turns the heater on and off in 10 minutes intervals. The set point is stable and the measured temperature is also fairly stable. At least it does not explain this behaviour. I attach a screendump of the log book. It is the service.home_assistant.turn_off that turns off the switch and 4 minutes later the switch is turned on again. Unclear what triggers this.
The switch is a zigbee switch controlled by MQTT. All other thermostats (that are stable) are implemented with GPIO over MQTT. Looking at the zigbee2mqtt log, I see MQTT payload commands changing the switch states.
Has anyone seen a thermostat behaviour like this? Since it just one out of six thermostats that screws up and this is based on zigbee devices, it easy to draw the conclusion this is related to zigbee. However, all thermostat devices are controlled by MQTT, so the physical interace should not have any impact on Home Assistant.
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