TC 2290 Error Code 22 on Power Up

TC 2290 Error Code 22 on Power Up

Trying to diagnose error code 22 I get on my TC 2290 on power up occasionally. Not all the time and it never affects the performance of the unit. I hit a button and it disappears and everything is normal. If I Power off and on a few times, it will eventually power up without the error code. It only happens occasionally. Anyone know what this is?

Thanks
Mark

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Source: http://forum.tcelectronic.com