Trane Precedent/Reliatel active setpoint locked

[gibjr]

I have a tracer summit system monitoring nine Voyager/Precedent RTU's with Retiatel. On one of the units the active setpoints in summit switch on their own to 90heating and 90cooling,after a cycle of power (of the unit) they revert to their controlling setpt.All of the boards in the RTU have been switched with a known good unit and the problem didn't follow.

Any ideas ?

[fjpitt]

Trane told us to check the transformer taps to verify the correct settings. Units are shipped for a default voltage and if taps are not moved to match yours, the controls will brown out and give the default to speak of.