Answer: The aeroplane mode, aeroplane on the DT500RF screen, is the Holiday mode, you can get out of the Holiday mode by lighting the screen with any button and then hold the aeroplane button for 3 sec till the aeroplane symbol disappears from the screen.

To get to the hand mode, hand symbol on screen, which is the Manual mode, you need to be out of the Holiday mode, you can toggle between the Manual and Schedule mode using the hand symbol button while the thermostat screen is lit, hand on screen is Manual mode, no hand on screen is Schedule mode with program number displayed.

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Question: How do I change the frequency of the DT500RF to avoid another DT500RF interference?
Answer: There is no way to change the frequency of a DT500RF.

The DT500RF works with a handshake connection, creating a robust link between the thermostat and receiver and do not interfere with each other when pairing is finished and closed. Fast disconnects after pairing process would indicate failed initial pairing.