I realized recently that I was not hearing the compressor turn on or the water draining from our Culligan Iron Cleer. First I unplugged the unit and plugged it back in. The compressor ran for a second and stopped. I did not have time to deal with it, so to prevent any damage, I bypassed the unit completely and unplugged the power. I kind of forgot about it until I was kindly reminded when I started getting the sulfur smell in the shower. It's not horrible, but is there. I am assuming the smell has started now because of bypassing the unit, so I just started looking into troubleshooting. It seems to be difficult finding any information on these units or some decent troubleshooting steps. I do have the original manual with troubleshooting, but they are very vague. I have the old style with 2 dials underneath the cover. I first tried plugging the unit back in, after it had been sitting for a while with the water supply shut off. The compressor turns on for a second or so and then stops. I did it a few times with the same result. I then removed the wires going to the compressor and connected it to straight power, without any issues. The compressor came on and ran like it should. I put everything back together, pressurized the unit and plugged it back in, but the compressor only ran for a second. I pushed the manual regeneration, but the compressor would not stay on. It did back flush, until I turned the dial to stop the process. I am guessing that I have a bad relay, but wanted to know if there is a way to test the one we have, before buying a new one. Is there anything else I can try? Thanks