Instructions Circuit Diagram

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10.4. Flash failures
Thefollowingerrorsmayoccorwhileashing:
“c” Checksum Error. YETI has received some irregular signals. Signals may have been
 disturbedbyotheropticalsources,suchasuorescentlights,orhavebeeninterrupted
shortly by movements.
“t” Timeout. The line-of-sight between YETI and the IR-Transceiver has been interrupted
completely.
“v” Verify Error. YETI wrote invalid data into its Flash-memory. This is a most unusual
situation, indicating the non-volatile programming memory (Flash-EPROM) has
 reachedtheendofitslifetime,accordingtospecicationsafterapproximately10.000
programming cycles.
Errorcorrectioncanberetriedtentimes.Incaseoffailuretheash-procedure
will be aborted.
If Checksum Errors are being indicated regularly while Flashing,
you may switch off or dim some lights in the room, especially
  uorescentlights.
Remember:
Always press the Program-button, before switching ON the YETI.
Otherwise the download procedure will not be started.