Strange OneWire behaviour after power outage. hardware or software issue?


I use a 8 Channel I2C to 1-Wire host adapter to read OneWire temperature sensors in order to manage my heating system. On Saturday midnight I had a power outage. Since that my temperature sensors work strange.

Backup restored but nothing changed. It seems to be hardware issue, but I am far not sure.

Strange behaviour

If I turn off all rules regarding to temperatures I can see all the temperature values in my sitemap without any issue. In this case it looks like there is no any issue.

As soon as I activate rules which are triggered on temperature change, OneWire binding starts throwing errors, and temperature values disappear (Undefined) from sitemap. Only some of them remain active. I haven’t checked yet, but as I remember undefined temperatures are connected on same wire. It looks like one of the channels broke.

Error log

2019-02-25 05:16:29.727 [INFO ] [nternal.connection.OneWireConnection] - Trying to reconnect to owserver...
2019-02-25 05:16:30.184 [INFO ] [nternal.connection.OneWireConnection] - Connected to owserver [IP '' Port '4304']
2019-02-25 05:16:30.194 [ERROR] [ding.onewire.internal.OneWireBinding] - Set Item for itemName=ff_bathroom_heating_temp to Undefined, because the readvalue is null
2019-02-25 05:17:15.348 [ERROR] [nternal.connection.OneWireConnection] - reading from path 28.0B1098060000/temperature attempt 1 throws exception
org.owfs.jowfsclient.OwfsException: Error -22
        at org.owfs.jowfsclient.internal.OwfsConnectionImpl.readPacket( [200:org.openhab.binding.onewire:1.12.0]
        at [200:org.openhab.binding.onewire:1.12.0]
        at org.openhab.binding.onewire.internal.connection.OneWireConnection.readFromOneWire( [200:org.openhab.binding.onewire:1.12.0]
        at org.openhab.binding.onewire.internal.OneWireBinding.updateItemFromOneWire( [200:org.openhab.binding.onewire:1.12.0]
        at org.openhab.binding.onewire.internal.OneWireBinding.devicePropertyWantsUpdate( [200:org.openhab.binding.onewire:1.12.0]
        at [200:org.openhab.binding.onewire:1.12.0]

What do you think, is this a hardware issue? How can that happen, temperature values disappear when rule runs? May I use wrong method to read temperature sensors in my rule? My rule runs without any issue for months.

Example Item configuration:

Number ff_bedroom1_heating_temp "Hálószoba [%.1f °C]" (Heating_temps) {onewire="deviceId=28.0B1098060000;propertyName=temperature"}

Affected rule

rule "Heating - Check Demand"
                Member of Heating_temps changed
                or Member of Heating_setpoints changed
		if (Heating_Main_Switch.state == ON) {
                                val String baseName ="_").get(0)+"_""_").get(1)
                                var current_temp = Heating_temps.allMembers.filter[m|].last.state as Number //gettin temp value
                                var currentSetpoint = sp.state as Number //getting room setpoint
                                val demand = Heating_demands.members.filter[d|].last
                                var Number hysteresis = 0.1
                                //logInfo("rules","BaseName: "+baseName)
                                if (sp.getGroupNames.contains("High_hysteresis")){ 
                                        hysteresis = 0.2
                                } else {
                                        hysteresis = 0.1
                                if( current_temp < (currentSetpoint - hysteresis) ){ //if temp lower than setpoint set demand

                                        if ( Only_Radiator_Heating_Switch.state == ON && !demand.getGroupNames.contains("Radiator_hatings") ){
                                        } else {
                                } else if (current_temp >= currentSetpoint){

Thank you for your support!

It seems that the binding (onewire1 I guess?) has problems reading from the owserver. Is the owserver running on the same machine? What is the owhttp-server reporting?

Thank you for your quick reply.
Yes, owserver runs on same machine on port 4304.
What is owhttp-server reporting? Where can I access?

Usually on port 3001. If possible, show a screenshot of that.