My 2 Zen thermostats have not been working right since 2.4.x, and I’ve finally found the issue, the drivers are not seeing the “mode” changes even with command retry enabled.
After checking the logs, I’ve confirmed this. You can see that operating state is working “pending heat”, but the driver thinks the thermostat mode is off.
If I manually set the thermostat to off from the device itself, and then to heat, Hubitat recognises the state again. This is the only way to get it to resync tho, taking the batteries out and reinstalling them doesn’t work like it would normally.
My upstairs thermostat driver is even more confused, I manually put it on heat, but Hubitat thinks it’s in cooling state, despite the logs showing it was put in heat mode.
Ok with command retry enabled it gets into a funky state after the off command is issued?
So off works, then no other commands are sent through?, is that accurate?
As far as I can tell yes that is accurate - it seems like it'll turn off the thermostats, but when it turns them back on, the mode doesnt get reported back to hubitat.
eg this morning, the downstairs thermostat was in heat mode, but hubitat thought it was off, even tho it was RM commanded it to heat and the 22.5c setpoint.
The upstairs thermostat behaviour had extra oddness, I was cycling through the modes via hubitat, and then from the unit, to try and get it to sync up, and it thought cooling state was active at one point while in heat mode. I suspect that is just a side effect of the states not updating correctly.
I'm not sure where my zen tstat is, but I tested command retry with a virtual thermostat and I'm not seeing any issues, of course the virtual stat reports immediately.
Of note command retry for thermostats only uses command retry for the following commands:
"setThermostatMode"
"setThermostatSetpoint"
"setCoolingSetpoint"
"setHeatingSetpoint"
The individual Heat, Cool, Off commands are not supported and are ignored.
I don't know if this is related to the issue or not.
I'll try to find my zen thermostat and see if I can replicate the issue
Thanks Mike. It's odd because command retry made the Zen's more reliable prior to 2.4.2.x - the main issues were not responding to mode changes and setpoints.
I dont have common wires on my systems, and no-one in Australia knows how to support 24AC control systems anymore. All the popular systems here are from Japanese/Korean companies with proprietary low voltage DC thermostats. So I'm stuck with my battery powered Zens.
