Nosram peart istc temp readout

[samd]

I have recently got one of these speedos and have used it a couple of times, but i cant get the temp readout option to work correctly.

As the manual says

- I turn off the speedo after a run

- I turn it on holding mode, then release mode

- Set LED starts to flash, but doesnt stop

The manual says it will flash 1 - 10 times depending on how hot the speedo got but even running for 30secs with the the speedo very cool, it just keeps flashing.

Everything else works fine, is it me or have a got a faulty unit??

Any help appreciated! SAM