Hi guys I own an aquarium chiller that I’m using for my tank right now. It is an ecoplus 1/10 hp model from 2013. It is an older model that is not sold anymore and is different from the model you would see on Amazon or elsewhere today. It has worked for quite some time as I bought it from a friend but recently has started to chill well past my set temperature. I’ve done a little bit of testing With the knowledge that I have concerning the relays. There are three LED lights on the control board. Power, chilling, and heater. The heater is an external 2prong outlet located on the back for you to use as an outlet for an external heater that would be dropped into the tank as a failsafe should the temperature be, lower than your set temp. With the relays this is what I have found.
So I just went back to it after letting the temperature warm up a bit. I set it to 66 as the temperature was at 68. Just to make a point to you the fan was blowing as soon as I plugged it in. But as the green Chiller light was flashing, as soon as it went solid I definitely heard and felt the relay click. Pole 1 is receiving NO power and 2, 3 and 4 all are. When the heater one clicked, it was poles 1, 2, & 4. so...
I just did it again and physically held the probes from the voltmeter on j9 and Pole 1 and as the green light was flashing as soon as it went solid it went straight to zero, I also then turn my set temp up to 69 and immediately that pole 1 received power again and as the red light was flashing once it went solid I heard the click and pole 3 went straight down to zero. So I'm assuming all of my relays are working. It has to be something else?