What UPL means
There's no low-level configuration in the control's memory. An in.stik is needed to program it.
Likely causes
- Control not configured or memory lost
Safe first checks
- Note the code.
When to stop
A tech or the spa dealer needs to program the control.
Checked against: Gecko Alliance Y-series and in.xe troubleshooting guide (9919-101313-D, July 2023). Codes can differ by model and year, so confirm with your owner's manual.