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▶ Check the grey ribbon on far right of the PCB (low voltage connection).
▶ If using a Key control product check the Key connections (black, white, red, green) are plugged into the correct position on the PCB (under installer cover on the far right hand side, leaving one space to the BUS connection).
▶ Check that the Key is pushed fully home.
▶ Check the batteries of the room control.
▶ Check the bridging links are fitted at LR & 230 V out.
▶ For wired room controls check the EMS BUS Voltage to the remote control is 12 - 15V DC.
▶ Check the 230 V external wiring does not run alongside the BUS connections, thus causing interference.
▶ Replace the control unit