Sometimes it can be a firmware or due to a hardware failure even. Try to leave it as it is until you get an error code or may it will function after all...
Have you checked the manual under Troubleshooting?
The only thought I have is this one;
Is the equipment in the energy saving mode (Automatic energy
saving mode)?
Press the [ENERGY SAVER] or [START] button on the control
panel to clear the mode. (It takes a while for the equipment
to become ready.)
P.43 "3.Energy Saving Mode
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