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Controller does not switch on
Battery level is too low.
Plug in a charger and check that the charge led
lights up.
Try switching on again by pressing and holding
down the power key until the start-up logo
appears.
Tripped thermal or current
fuse
If the device has recently been subjected to:
a) rewiring on sensor side, or
b) temperature beyond specified range
the thermal or current fuses may have tripped.
Reinstall the SD card if it was removed.
Rule out low or damaged battery before
replacing the SD card.