core/homeassistant/components/evohome/icons.json

{
  "services": {
    "set_system_mode": "mdi:pencil",
    "reset_system": "mdi:refresh",
    "refresh_system": "mdi:refresh",
    "set_zone_override": "mdi:motion-sensor",
    "clear_zone_override": "mdi:motion-sensor-off"
  }
}