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Vera to horstmann boiler control relay (help needed)

Please assist, i'm new to home automation.
I have a vera unit "linked" to the horstmann ASR2-RF two-relay boiler control unit.
I can switch the relays using the vera control panel if i selece OFF or HEAT. the other two options COOL and AUTO have no function.
However, after a time the ASR unit has a failsafe time out function if it does not get a regular signal sent to it, unless you operate the unit in "binary switch mode", (rather than "thermostat mode" as i currently can only do)
So, i need to be able to operate the boiler-control unit in binary mode.
As far as i can make out i need to issue an LUUP command as follows:
luup.call_action("urn:upnp-org:serviceId:SwitchPower1", "SetTarget", {NewTargetValue = "1"}, 14)
but this has no function (the device is #14)
can anyone assist or correct me here please.
many thanks
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