I'm using a C7 and have experienced this a few times-
i have a z-wave (not plus) device that is boiler hot-water control relay.
It has a basic rule to come on at a set time and then (as part of the same rule) switch off X minutes later. More frequently of late, it does not get the off command. As a work-around i added another command to act 5 mins after the Off command to send out another Off command in case the first didnt get received. Occasionally this got missed too so i added yet another Off command a further 5 mins after that, thus the rule being:
At 7:02am turn on relay
then wait 28 mins turn off relay
then wait 5 mins turn off relay
then wait 5 mins turn off relay
Belt and braces approach but today i logged that even after 3 OFF commands, the relay was still engaged. Log appears that hubitat is doing its bit-
My guess is the z-wave signal is not getting to the device (interference??) I could add another 5min delay and send a FOURTH off command but perhaps there is a better way to prevent this system failure. One or two misses, ok, but three times?
Any suggestions of how to fix or perhaps the cause of this?
thanks
I would suggest that before you spend five minutes trying to solve this, you replace the relay with a Z-Wave Plus or Zigbee. The old Z-Wave devices may not perform as well, and do not update Hubitat with current status if switched manually (unless you add a Poller app to poll it).
Maybe you could use the old Z-Wave relay in a less critical application.
thanks, @HAL9000 , that is a consideration i've made.
The unit is a wall mounted double-relay (boiler control for heating AND hotwater) and i have not yet found a suitable replacement. The device also has an inbuilt auto-fail safety feature that if it receives NO z-wave signal for 30 minutes it goes to the OFF state, as you'd expect for a boiler control. I think hubitat keeps this signal path open whereas my old vera system i had to write code to refresh communication at least once every 20mins
Open to suggestions for new hardware
