Of course it may not be the thermocouple at all - it may be the control electronics failing to properly recognise the signal from the sensor.
It will be very unlikely to be both of these things - very, very unlikely.
Pope's Private Secretary
September 2014
I would guess that the device that detects the heat from the flame (themocouple) is defective - the control electronics think that there is no flame - light the flame failure led and shut things down.