Requires the ZHA Toolkit custom component available on HACS. Removes all existing ZHA bindings between a light switch and a bulb, then attempts to re-establish a direct binding between them to resolve communication issues.

heal_ikea_zha_bindings.yaml

blueprint:
  name: Heal IKEA ZHA Bindings
  description: 'Requires the ZHA Toolkit custom component available on HACS. 
  Removes all existing ZHA bindings between a light switch and a bulb, then
  attempts to re-establish a direct binding between them to resolve
  communication issues.'
  domain: script
  author: HarvsG
mode: single
fields:
  lightswitch_field:
    selector:
      device: {}
    default: 6029af46ec876a36e3b01d65f8649478
    required: true
    name: Lightswitch Device ID
    description: The tradfri on/off switch or lightswitch device ID
  bulb_field:
    selector:
      entity: {}
    name: Bulb
    default: light.study_lamp
    required: true
    description: The entity_id of the light which must not be a group
sequence:
  - action: zha_toolkit.binds_remove_all
    data:
      ieee: "{{lightswitch_field}}"
      event_success: unbind_success
      command_data: "{{bulb_field}}"
      event_fail: unbind_failure
      event_done: unbind_done
    response_variable: unbind_response
  - wait_for_trigger:
      - trigger: event
        event_type: unbind_done
    enabled: false
  - variables:
      removed: "{{unbind_response.result.removed}}"
      errors: "{{unbind_response.errors}}"
      target_device_id: "{{device_id(unbind_response.command_data)}}"
      target_device_iee: >-
        {{ device_attr(device_id(unbind_response.command_data), 'identifiers') |
        list | first | last }}
      skipped_ieees: >-
        {{unbind_response.result.skipped | map(attribute='dst') |
        map(attribute='dst_ieee') | list | unique | list}}
  - condition: template
    value_template: "{{ target_device_ieee not in skipped_ieees }}"
  - action: zha_toolkit.bind_ieee
    data:
      ieee: "{{lightswitch_field}}"
      command_data: "{{bulb_field}}"
      event_success: bind_success
      event_fail: bind_failure
      tries: 5
      event_done: bind_done
    response_variable: bind_response
    enabled: true
  - wait_for_trigger:
      - trigger: event
        event_type: bind_done
    enabled: false
  - action: persistent_notification.create
    metadata: {}
    data:
      notification_id: bind_heal_{{unbind_response.ieee}}
      title: Zigbee binding heal
      message: >-
        The heal was attempted between {{device_name(lightswitch_field)}} and
        {{unbind_response.command_data}}

Pairs well with an automation to identify broken bindings and call this script.

Community forum post with tutorial