I am having the same issue with my fan switches, same model. This works with all of my dimmers. Here I grepped the log of everything ZWave while attempting to set the LED to off. I just upgraded to 2.4, but this was occurring with 2.3 as well. I just never got around to posting here about it. Maybe @chris can shed some light.
2019-03-29 13:52:52.575 [DEBUG] [ding.zwave.handler.ZWaveThingHandler] - NODE 7: Configuration update received
2019-03-29 13:52:52.607 [DEBUG] [ding.zwave.handler.ZWaveThingHandler] - NODE 7: Configuration update set config_3_1 to 2 (BigDecimal)
2019-03-29 13:52:52.610 [DEBUG] [class.ZWaveConfigurationCommandClass] - NODE 7: Creating new message for application command CONFIGURATION_SET
2019-03-29 13:52:52.613 [DEBUG] [ng.zwave.internal.protocol.ZWaveNode] - NODE 7: SECURITY not supported
2019-03-29 13:52:52.615 [DEBUG] [ng.zwave.internal.protocol.ZWaveNode] - NODE 7: Command Class COMMAND_CLASS_CONFIGURATION is NOT required to be secured
2019-03-29 13:52:52.622 [DEBUG] [nal.protocol.ZWaveTransactionManager] - NODE 7: Adding to device queue
2019-03-29 13:52:52.625 [DEBUG] [nal.protocol.ZWaveTransactionManager] - NODE 7: Added 3490 to queue - size 1
2019-03-29 13:52:52.628 [DEBUG] [nal.protocol.ZWaveTransactionManager] - Transaction SendNextMessage 0 out at start. Holdoff false.
2019-03-29 13:52:52.642 [DEBUG] [ing.zwave.handler.ZWaveSerialHandler] - NODE 7: Sending REQUEST Message = 01 0C 00 13 07 05 70 04 03 01 02 25 56 E5
2019-03-29 13:52:53.424 [DEBUG] [ing.zwave.handler.ZWaveSerialHandler] - Message SENT
2019-03-29 13:52:53.427 [DEBUG] [WaveSerialHandler$ZWaveReceiveThread] - Receive Message = 06
2019-03-29 13:52:53.428 [DEBUG] [nal.protocol.ZWaveTransactionManager] - Transaction SendNextMessage started: TID 3490: [WAIT_RESPONSE] priority=Config, requiresResponse=true, callback: 86
2019-03-29 13:52:53.430 [DEBUG] [nal.protocol.ZWaveTransactionManager] - processReceiveMessage input 0<>128 : Message: class=null[0], type=ACK[2], dest=255, callback=0, payload=
2019-03-29 13:52:53.432 [DEBUG] [nal.protocol.ZWaveTransactionManager] - Received msg (0): Message: class=null[0], type=ACK[2], dest=255, callback=0, payload=
2019-03-29 13:52:53.435 [DEBUG] [nal.protocol.ZWaveTransactionManager] - lastTransaction TID 3490: [WAIT_RESPONSE] priority=Config, requiresResponse=true, callback: 86
2019-03-29 13:52:53.434 [DEBUG] [class.ZWaveConfigurationCommandClass] - NODE 7: Creating new message for application command CONFIGURATIONCMD_GET
2019-03-29 13:52:53.436 [DEBUG] [WaveSerialHandler$ZWaveReceiveThread] - Receive Message = 01 04 01 13 01 E8
2019-03-29 13:52:53.437 [DEBUG] [nal.protocol.ZWaveTransactionManager] - Received msg: ACK
2019-03-29 13:52:53.439 [DEBUG] [nal.protocol.ZWaveTransactionManager] - ZWaveReceiveThread queue empty
2019-03-29 13:52:53.438 [DEBUG] [ng.zwave.internal.protocol.ZWaveNode] - NODE 7: SECURITY not supported
2019-03-29 13:52:53.441 [DEBUG] [nal.protocol.ZWaveTransactionManager] - processReceiveMessage input 0<>128 : Message: class=SendData[19], type=Response[1], dest=255, callback=0, payload=01
2019-03-29 13:52:53.441 [DEBUG] [nal.protocol.ZWaveTransactionManager] - Transaction SendNextMessage 1 out at start. Holdoff false.
2019-03-29 13:52:53.441 [DEBUG] [ng.zwave.internal.protocol.ZWaveNode] - NODE 7: Command Class COMMAND_CLASS_CONFIGURATION is NOT required to be secured
2019-03-29 13:52:53.444 [DEBUG] [nal.protocol.ZWaveTransactionManager] - Received msg (0): Message: class=SendData[19], type=Response[1], dest=255, callback=0, payload=01
2019-03-29 13:52:53.445 [DEBUG] [nal.protocol.ZWaveTransactionManager] - NODE 7: Adding to device queue
2019-03-29 13:52:53.447 [DEBUG] [nal.protocol.ZWaveTransactionManager] - lastTransaction TID 3490: [WAIT_RESPONSE] priority=Config, requiresResponse=true, callback: 86
2019-03-29 13:52:53.449 [DEBUG] [nal.protocol.ZWaveTransactionManager] - NODE 7: Added 3491 to queue - size 1
2019-03-29 13:52:53.452 [DEBUG] [WaveSerialHandler$ZWaveReceiveThread] - Receive Message = 01 07 00 13 56 00 00 02 BF
2019-03-29 13:52:53.453 [DEBUG] [nal.protocol.ZWaveTransactionManager] - Transaction SendNextMessage 1 out at start. Holdoff false.
2019-03-29 13:52:53.458 [DEBUG] [nal.protocol.ZWaveTransactionManager] - processReceiveMessage input 0<>128 : Message: class=SendData[19], type=Request[0], dest=0, callback=86, payload=56 00 00 02
2019-03-29 13:52:53.458 [DEBUG] [nal.protocol.ZWaveTransactionManager] - Checking outstanding transactions: 1
2019-03-29 13:52:53.460 [DEBUG] [nal.protocol.ZWaveTransactionManager] - Last transaction: TID 3490: [WAIT_RESPONSE] priority=Config, requiresResponse=true, callback: 86
2019-03-29 13:52:53.463 [DEBUG] [ve.internal.protocol.ZWaveController] - Incoming Message: Message: class=SendData[19], type=Response[1], dest=255, callback=0, payload=01
2019-03-29 13:52:53.469 [DEBUG] [nal.protocol.ZWaveTransactionManager] - TID 3490: Advanced to WAIT_REQUEST
2019-03-29 13:52:53.471 [DEBUG] [nal.protocol.ZWaveTransactionManager] - NODE 7: TID 3490: Transaction not completed
2019-03-29 13:52:53.474 [DEBUG] [nal.protocol.ZWaveTransactionManager] - Received msg (0): Message: class=SendData[19], type=Request[0], dest=0, callback=86, payload=56 00 00 02
2019-03-29 13:52:53.476 [DEBUG] [nal.protocol.ZWaveTransactionManager] - lastTransaction TID 3490: [WAIT_REQUEST] priority=Config, requiresResponse=true, callback: 86
2019-03-29 13:52:53.487 [DEBUG] [nal.protocol.ZWaveTransactionManager] - Checking outstanding transactions: 1
2019-03-29 13:52:53.489 [DEBUG] [nal.protocol.ZWaveTransactionManager] - Last transaction: TID 3490: [WAIT_REQUEST] priority=Config, requiresResponse=true, callback: 86
2019-03-29 13:52:53.492 [DEBUG] [nal.protocol.ZWaveTransactionManager] - Checking TID 3490: (Callback 86)
2019-03-29 13:52:53.494 [DEBUG] [.serialmessage.ZWaveCommandProcessor] - Callback match!
2019-03-29 13:52:53.497 [DEBUG] [nal.protocol.ZWaveTransactionManager] - Correlated to TID 3490: callback 86
2019-03-29 13:52:53.499 [DEBUG] [ve.internal.protocol.ZWaveController] - Incoming Message: Message: class=SendData[19], type=Request[0], dest=0, callback=86, payload=56 00 00 02
2019-03-29 13:52:53.513 [DEBUG] [ng.zwave.internal.protocol.ZWaveNode] - NODE 7: resetResendCount initComplete=true isDead=false
2019-03-29 13:52:53.516 [DEBUG] [e.internal.protocol.ZWaveTransaction] - TID 3490: Transaction COMPLETED
2019-03-29 13:52:53.517 [DEBUG] [nal.protocol.ZWaveTransactionManager] - NODE 7: Response processed after 89ms
2019-03-29 13:52:53.519 [DEBUG] [nal.protocol.ZWaveTransactionManager] - NODE 7: TID 3490: Transaction completed
2019-03-29 13:52:53.521 [DEBUG] [nal.protocol.ZWaveTransactionManager] - NODE 7: notifyTransactionResponse TID:3490 DONE
2019-03-29 13:52:53.524 [DEBUG] [ding.zwave.handler.ZWaveThingHandler] - NODE 7: Got an event from Z-Wave network: ZWaveTransactionCompletedEvent
2019-03-29 13:52:53.526 [DEBUG] [nal.protocol.ZWaveTransactionManager] - ZWaveReceiveThread queue empty
2019-03-29 13:52:53.528 [DEBUG] [nal.protocol.ZWaveTransactionManager] - Transaction SendNextMessage 0 out at start. Holdoff false.
2019-03-29 13:52:53.535 [DEBUG] [ing.zwave.handler.ZWaveSerialHandler] - NODE 7: Sending REQUEST Message = 01 0A 00 13 07 03 70 05 03 25 57 E6
2019-03-29 13:52:53.537 [DEBUG] [ing.zwave.handler.ZWaveSerialHandler] - Message SENT
2019-03-29 13:52:53.539 [DEBUG] [nal.protocol.ZWaveTransactionManager] - Transaction SendNextMessage started: TID 3491: [WAIT_RESPONSE] priority=Config, requiresResponse=true, callback: 87
2019-03-29 13:52:53.539 [DEBUG] [WaveSerialHandler$ZWaveReceiveThread] - Receive Message = 06
2019-03-29 13:52:53.541 [DEBUG] [nal.protocol.ZWaveTransactionManager] - processReceiveMessage input 0<>128 : Message: class=null[0], type=ACK[2], dest=255, callback=0, payload=
2019-03-29 13:52:53.546 [DEBUG] [WaveSerialHandler$ZWaveReceiveThread] - Receive Message = 01 04 01 13 01 E8
2019-03-29 13:52:53.544 [DEBUG] [nal.protocol.ZWaveTransactionManager] - Received msg (0): Message: class=null[0], type=ACK[2], dest=255, callback=0, payload=
2019-03-29 13:52:53.550 [DEBUG] [nal.protocol.ZWaveTransactionManager] - lastTransaction TID 3491: [WAIT_RESPONSE] priority=Config, requiresResponse=true, callback: 87
2019-03-29 13:52:53.551 [DEBUG] [nal.protocol.ZWaveTransactionManager] - Received msg: ACK
2019-03-29 13:52:53.553 [DEBUG] [nal.protocol.ZWaveTransactionManager] - ZWaveReceiveThread queue empty
2019-03-29 13:52:53.554 [DEBUG] [nal.protocol.ZWaveTransactionManager] - processReceiveMessage input 0<>128 : Message: class=SendData[19], type=Response[1], dest=255, callback=0, payload=01
2019-03-29 13:52:53.556 [DEBUG] [nal.protocol.ZWaveTransactionManager] - Transaction SendNextMessage 1 out at start. Holdoff false.
2019-03-29 13:52:53.558 [DEBUG] [nal.protocol.ZWaveTransactionManager] - Received msg (0): Message: class=SendData[19], type=Response[1], dest=255, callback=0, payload=01
2019-03-29 13:52:53.561 [DEBUG] [nal.protocol.ZWaveTransactionManager] - lastTransaction TID 3491: [WAIT_RESPONSE] priority=Config, requiresResponse=true, callback: 87
2019-03-29 13:52:53.563 [DEBUG] [nal.protocol.ZWaveTransactionManager] - Checking outstanding transactions: 1
2019-03-29 13:52:53.563 [DEBUG] [WaveSerialHandler$ZWaveReceiveThread] - Receive Message = 01 07 00 13 57 00 00 02 BE
2019-03-29 13:52:53.565 [DEBUG] [nal.protocol.ZWaveTransactionManager] - Last transaction: TID 3491: [WAIT_RESPONSE] priority=Config, requiresResponse=true, callback: 87
2019-03-29 13:52:53.568 [DEBUG] [ve.internal.protocol.ZWaveController] - Incoming Message: Message: class=SendData[19], type=Response[1], dest=255, callback=0, payload=01
2019-03-29 13:52:53.569 [DEBUG] [nal.protocol.ZWaveTransactionManager] - processReceiveMessage input 0<>128 : Message: class=SendData[19], type=Request[0], dest=0, callback=87, payload=57 00 00 02
2019-03-29 13:52:53.572 [DEBUG] [nal.protocol.ZWaveTransactionManager] - TID 3491: Advanced to WAIT_REQUEST
2019-03-29 13:52:53.575 [DEBUG] [nal.protocol.ZWaveTransactionManager] - NODE 7: TID 3491: Transaction not completed
2019-03-29 13:52:53.576 [DEBUG] [WaveSerialHandler$ZWaveReceiveThread] - Receive Message = 01 0B 00 04 00 07 05 70 06 03 01 00 86
2019-03-29 13:52:53.578 [DEBUG] [nal.protocol.ZWaveTransactionManager] - Received msg (0): Message: class=SendData[19], type=Request[0], dest=0, callback=87, payload=57 00 00 02
2019-03-29 13:52:53.580 [DEBUG] [nal.protocol.ZWaveTransactionManager] - lastTransaction TID 3491: [WAIT_REQUEST] priority=Config, requiresResponse=true, callback: 87
2019-03-29 13:52:53.582 [DEBUG] [nal.protocol.ZWaveTransactionManager] - Checking outstanding transactions: 1
2019-03-29 13:52:53.583 [DEBUG] [nal.protocol.ZWaveTransactionManager] - processReceiveMessage input 0<>128 : Message: class=ApplicationCommandHandler[4], type=Request[0], dest=7, callback=0, payload=00 07 05 70 06 03 01 00
2019-03-29 13:52:53.584 [DEBUG] [nal.protocol.ZWaveTransactionManager] - Last transaction: TID 3491: [WAIT_REQUEST] priority=Config, requiresResponse=true, callback: 87
2019-03-29 13:52:53.586 [DEBUG] [nal.protocol.ZWaveTransactionManager] - Checking TID 3491: (Callback 87)
2019-03-29 13:52:53.589 [DEBUG] [.serialmessage.ZWaveCommandProcessor] - Callback match!
2019-03-29 13:52:53.591 [DEBUG] [nal.protocol.ZWaveTransactionManager] - Correlated to TID 3491: callback 87
2019-03-29 13:52:53.594 [DEBUG] [ve.internal.protocol.ZWaveController] - Incoming Message: Message: class=SendData[19], type=Request[0], dest=0, callback=87, payload=57 00 00 02
2019-03-29 13:52:53.599 [DEBUG] [ng.zwave.internal.protocol.ZWaveNode] - NODE 7: resetResendCount initComplete=true isDead=false
2019-03-29 13:52:53.600 [DEBUG] [nal.protocol.ZWaveTransactionManager] - TID 3491: Advanced to WAIT_DATA
2019-03-29 13:52:53.603 [DEBUG] [nal.protocol.ZWaveTransactionManager] - NODE 7: TID 3491: Transaction not completed
2019-03-29 13:52:53.606 [DEBUG] [nal.protocol.ZWaveTransactionManager] - Received msg (0): Message: class=ApplicationCommandHandler[4], type=Request[0], dest=7, callback=0, payload=00 07 05 70 06 03 01 00
2019-03-29 13:52:53.608 [DEBUG] [nal.protocol.ZWaveTransactionManager] - lastTransaction null
2019-03-29 13:52:53.610 [DEBUG] [nal.protocol.ZWaveTransactionManager] - NODE 7: Application Command Request (ALIVE:DONE)
2019-03-29 13:52:53.613 [DEBUG] [ng.zwave.internal.protocol.ZWaveNode] - NODE 7: resetResendCount initComplete=true isDead=false
2019-03-29 13:52:53.615 [DEBUG] [ng.zwave.internal.protocol.ZWaveNode] - NODE 7: Incoming command class COMMAND_CLASS_CONFIGURATION, endpoint 0
2019-03-29 13:52:53.617 [DEBUG] [ng.zwave.internal.protocol.ZWaveNode] - NODE 7: SECURITY not supported
2019-03-29 13:52:53.620 [DEBUG] [tocol.commandclass.ZWaveCommandClass] - NODE 7: Received COMMAND_CLASS_CONFIGURATION V1 CONFIGURATIONCMD_REPORT
2019-03-29 13:52:53.622 [DEBUG] [class.ZWaveConfigurationCommandClass] - NODE 7: Node configuration report, parameter = 3, value = 0, size = 1
2019-03-29 13:52:53.625 [DEBUG] [ding.zwave.handler.ZWaveThingHandler] - NODE 7: Got an event from Z-Wave network: ZWaveConfigurationParameterEvent
2019-03-29 13:52:53.627 [DEBUG] [ding.zwave.handler.ZWaveThingHandler] - NODE 7: Got a value event from Z-Wave network, endpoint = 0, command class = COMMAND_CLASS_CONFIGURATION, value = org.openhab.binding.zwave.internal.protocol.ZWaveConfigurationParameter@2ba835
2019-03-29 13:52:53.629 [DEBUG] [ding.zwave.handler.ZWaveThingHandler] - NODE 7: Update CONFIGURATION 3/1 to 0
2019-03-29 13:52:53.632 [DEBUG] [nal.protocol.ZWaveTransactionManager] - NODE 7: Commands processed 1.
2019-03-29 13:52:53.634 [DEBUG] [nal.protocol.ZWaveTransactionManager] - NODE 7: Checking command org.openhab.binding.zwave.internal.protocol.ZWaveCommandClassPayload@f3faa5.
2019-03-29 13:52:53.636 [DEBUG] [nal.protocol.ZWaveTransactionManager] - NODE 7: Command verified org.openhab.binding.zwave.internal.protocol.ZWaveCommandClassPayload@f3faa5.
2019-03-29 13:52:53.638 [DEBUG] [nal.protocol.ZWaveTransactionManager] - NODE 7: notifyTransactionResponse TID:3491 DONE
2019-03-29 13:52:53.641 [DEBUG] [ding.zwave.handler.ZWaveThingHandler] - NODE 7: Got an event from Z-Wave network: ZWaveTransactionCompletedEvent
2019-03-29 13:52:53.643 [DEBUG] [nal.protocol.ZWaveTransactionManager] - Transaction completed - outstandingTransactions 1
2019-03-29 13:52:53.645 [DEBUG] [nal.protocol.ZWaveTransactionManager] - Transaction completed - outstandingTransactions 0
2019-03-29 13:52:53.647 [DEBUG] [nal.protocol.ZWaveTransactionManager] - ZWaveReceiveThread queue empty
2019-03-29 13:52:53.649 [DEBUG] [nal.protocol.ZWaveTransactionManager] - Transaction SendNextMessage 0 out at start. Holdoff false.