2020-06-02 14:21:03.701 [temChannelLinkRemovedEvent] - Link 'StiebelHeatPumpLWZ303509_NominalValues_P07FanStageStandard => stiebelheatpump:LWZ_THZ303_5_09:bd9ce383:nominalValues#p07FanStageStandardMode' has been removed.

==> /var/log/openhab2/openhab.log <==
2020-06-02 14:21:03.702 [ERROR] [ome.core.thing.link.ThingLinkManager] - Exception occurred while informing handler: x != [B
java.util.IllegalFormatConversionException: x != [B
	at java.util.Formatter$FormatSpecifier.failConversion(Formatter.java:4302) ~[?:1.8.0_252]
	at java.util.Formatter$FormatSpecifier.printInteger(Formatter.java:2793) ~[?:1.8.0_252]
	at java.util.Formatter$FormatSpecifier.print(Formatter.java:2747) ~[?:1.8.0_252]
	at java.util.Formatter.format(Formatter.java:2520) ~[?:1.8.0_252]
	at java.util.Formatter.format(Formatter.java:2455) ~[?:1.8.0_252]
	at java.lang.String.format(String.java:2940) ~[?:1.8.0_252]
	at org.openhab.binding.stiebelheatpump.internal.StiebelHeatPumpHandler.channelUnlinked(StiebelHeatPumpHandler.java:232) ~[?:?]
	at org.eclipse.smarthome.core.thing.link.ThingLinkManager.lambda$1(ThingLinkManager.java:287) ~[?:?]
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_252]
	at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_252]
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) [?:1.8.0_252]
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) [?:1.8.0_252]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_252]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_252]
	at java.lang.Thread.run(Thread.java:748) [?:1.8.0_252]
2020-06-02 14:21:16.914 [DEBUG] [pump.internal.StiebelHeatPumpHandler] - Found valid record definition in request (00)17  with ChannelID:nominalValues#p07FanStageStandardMode
2020-06-02 14:21:16.915 [ERROR] [pump.internal.StiebelHeatPumpHandler] - Setting could not be read from heatpump.communication is used by other task!
2020-06-02 14:21:16.916 [INFO ] [pump.internal.StiebelHeatPumpHandler] - Refresh for newly linked setting of heat pump.

==> /var/log/openhab2/events.log <==
2020-06-02 14:21:16.916 [.ItemChannelLinkAddedEvent] - Link 'StiebelHeatPumpLWZ303509_NominalValues_P07FanStageStandard-stiebelheatpump:LWZ_THZ303_5_09:bd9ce383:nominalValues#p07FanStageStandardMode' has been added.



2nd try:

2020-06-02 14:23:23.596 [ERROR] [ome.core.thing.link.ThingLinkManager] - Exception occurred while informing handler: x != [B
java.util.IllegalFormatConversionException: x != [B
	at java.util.Formatter$FormatSpecifier.failConversion(Formatter.java:4302) ~[?:1.8.0_252]
	at java.util.Formatter$FormatSpecifier.printInteger(Formatter.java:2793) ~[?:1.8.0_252]
	at java.util.Formatter$FormatSpecifier.print(Formatter.java:2747) ~[?:1.8.0_252]
	at java.util.Formatter.format(Formatter.java:2520) ~[?:1.8.0_252]
	at java.util.Formatter.format(Formatter.java:2455) ~[?:1.8.0_252]
	at java.lang.String.format(String.java:2940) ~[?:1.8.0_252]
	at org.openhab.binding.stiebelheatpump.internal.StiebelHeatPumpHandler.channelUnlinked(StiebelHeatPumpHandler.java:232) ~[?:?]
	at org.eclipse.smarthome.core.thing.link.ThingLinkManager.lambda$1(ThingLinkManager.java:287) ~[?:?]
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_252]
	at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_252]
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) [?:1.8.0_252]
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) [?:1.8.0_252]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_252]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_252]
	at java.lang.Thread.run(Thread.java:748) [?:1.8.0_252]

==> /var/log/openhab2/events.log <==
2020-06-02 14:23:23.598 [temChannelLinkRemovedEvent] - Link 'StiebelHeatPumpLWZ303509_NominalValues_P07FanStageStandard => stiebelheatpump:LWZ_THZ303_5_09:bd9ce383:nominalValues#p07FanStageStandardMode' has been removed.

==> /var/log/openhab2/openhab.log <==
2020-06-02 14:23:33.708 [DEBUG] [pump.internal.StiebelHeatPumpHandler] - Found valid record definition in request (00)17  with ChannelID:nominalValues#p07FanStageStandardMode
2020-06-02 14:23:33.709 [ERROR] [pump.internal.StiebelHeatPumpHandler] - Setting could not be read from heatpump.communication is used by other task!
2020-06-02 14:23:33.709 [INFO ] [pump.internal.StiebelHeatPumpHandler] - Refresh for newly linked setting of heat pump.