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Customer wants to troubleshoot the ATS48 fan not running.
ATS48, Altistart 48
OHF - Overheating
The cooling fans are supplied with 12Vdc. The voltage tolerance on the fans is 6-13Vdc, 315mA. You can test operation of the fans with something such as a 9V battery, if a 12Vdc source is not available. This should provide enough power to move the fans.