Heatit z-trm3

I have added 2 Heatit z-trm3 thermostats to a TellStick ZNet Lite v2 and added them to HA with the Telldus Live integration. I can get information of the power consumtion, the temperature and if they are heating or not. I can also create an automation that turns them off using an action similar to:

action:
  - type: turn_off
    device_id: id
    entity_id: switch.fh_kitchen_master
    domain: switch

What I cannot do is to create an automation that turns them on using a similar action as above but with type ‘turn_on’. Then I get the following error in the logs:

Logger: tellduslive
Source: /usr/local/lib/python3.8/site-packages/tellduslive.py:351
First occurred: 19:19:17 (2 occurrences)
Last logged: 19:19:18

Failed request: Device "8921253104" does not support method "1"
Failed request: Device "8951221109" does not support method "1"

Anyone else seen this?