My 220 volt heater stopped getting power. Brett-Aqualine CP-104 controller only a month old. I'm getting 110 across the heater contactor coil when I turn up the t-stat, but no current from the contactor . Any ideas why the contactor would go bad in a new unit?

Sometimes things break. It is a 110v coil, not a 220 coil relay, right?

Yes, it's a 110v coil. I'll replace it and see what happens!