RADEMACHER 9485 Instruction Manual For The Electrical Connection And For Commissioning page 123

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22. Error messages
Error 2
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Error 3
There is a communication problem.
◆ Check that all logged-on actuators and the HomePilot® if
necessary are connected properly and are within range.
◆ A repeater may be required for larger distances.
Each DuoFern device that is connected to the mains
power supply is a repeater (e.g. switch actuator sockets,
HomePilot®, DuoFern actuators etc).
◆ If devices have been logged on that are no longer available
(e.g. due to a defect, amongst other things), these can be
deleted by the "Clear up" function, see page 106.
◆ In the event of a transmission error, the device makes an
attempt to reach the DuoFern actuator or the HomePilot®
again every 10 minutes.
The error message disappears automatically if this is
successful.
The DuoFern Room Thermostat 9485 does not
function until the error has been confirmed.
The controller is switched off.
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