Thanks for the reply Bama. Any additional feedback would be great because this is driving me crazy.
It is on a free standing hot tub. I do not know the make/model of the hot tub but it is old. For the last nine months, the relay has been buzzing/chattering/clicking. I have been able to tap it and/or cycle the breaker and it would start working again. This weekend, I heard it buzzing so I opened the cabinet, opened up the relay, and tapped on it. Now, nothing happens when I set dial to start when the temp is at a certain set point. I have reset the breaker several times, hit the reset several times with no change. When I turn the temp dial, it clicks but the heater/pump do not start. However, when I switch the dial to timer, the pump will start and the heater comes on and heats to the desired temp. These are the reasons that I believe the contactor/relay needs to be replaced.