What would cause the CTR-M to turn off (fan related, Open the bypass)?

It depends on the thermal sensor mounted near SCR. When the thermal sensor operates, stop the SCR gate drive. Then, UPS will display “WARNING” on LCD, and store a log “TEMP ALARM (STS)”.
In the case of the parallel redundant UPS, the UPS that detects the abnormal temperature is disconnected (parallel-off). And the normal UPS(s) continues to supply power to the critical load.

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