Can you advise on the display which 2 lights are illuminated, and if they are flashing, and if there is a code such as "F01" shown in the LCD display.
Switch the machine off and following the maintenance instructions found here on page 6, I suspect the water container and filter hasnt been correctly inserted or emptied \ cleaned. Once you have removed both and emptied\cleaned them as per the manual, check they are fully inserted back in place, I would then clean the condenser unit which is explained on the same page (bottom right).
Shut the dryer door, turn the power back on and then try a drying cycle again.
Please let me know what is shown on the display (which lights illuminated, what numbers \ time is shown on the LCD).
The next thing I would look to check is the door mechanism, you mention it was lose.
With the machine off, close the door, apply inward pressure on the door so its firmly closed and secured, then turn the dryer back on.
If the light comes straight on this suggests there is a hardware fault which will require an engineer, in most cases the machine will advise which component is at fault, however in this instance the fact your not getting a specific error code, it suggest the main PCB has failed, or at least the sensors for water container and filter are not working properly.
If the light still occurs and you would like an engineer out to strip the unit down, to investigate further, please advise me of your postcode and I can recommend someone in your area.
I haven't heard from you in the last few days, please let me know if you need any further assistance, if not I would appreciate if you could rate the service received.