Although there can be many factors to this, there are three probable reasons for this situation.

1- During installation, the unit was either wired incorrectly or shorted. Electrical shorts can happen in an instant without any noticeable signs. Please be careful. Once the unit has been shorted, there is nothing that A'PEX can do to repair the unit. It must be replaced or purchased again.

2- Make sure that both grounds have been properly connected.

3- Although rare, the units are mass produced in large quantities and defects can happen. If the steps above do not correct the situation, kindly repack the unit with all original components and return the unit to the dealer of purchase accompanied with original receipt (Required to process requests). Warranty claims for electronics must be made within 30 days of purchase.