STC 1000 problem?

[Hamaki]

I probably haven't searched every thread for this particular problem & solution but I've looked quite a bit with no success.

I built a ferm chamber & wired the new STC 1000 for heat only (for the time being, cold basement). My problem - every time I press the down arrow, alone or together with S, the screen goes blank. When I release I see 8.8.8 briefly and then it goes back to displaying the current temp. Does the same thing if I try to adjust any F setting. I initially wired it per my read of the instructions...WRONG I then rewired per Revvy's diagram. Now the heat comes on but still the same 8.8.8 problem. Bad unit? Did I mess it up by wiring wrong initially? Have I missed something? Thanks in advance for any thoughts!

 

[raouliii]

.....Did I mess it up by wiring wrong initially? ....

Very possible. It depends on what you initially mis-wired. Are you sure it's wired correctly now? Snapshot maybe.

If you applied line voltage to the probe connections, it may be toast. Applying line voltage to the relay in/out would smoke the relay if the relay switched on. Did you see or smell smoke?

 

[Hamaki]

Thanks for the response, raouliii. No power to the probe connections. No smoke, pop, or burned electronic smell.

Initially I had B & W line power to posts 1 & 2, probe to 3 & 4, and lines to switched outlet at 5 & 6.

I rewired so line power black goes to 1 with a jumper from 1 to 5, black line from 6 to switched outlet, line power white goes to 2, white line to switched outlet also connects to 2. Probe to 3 & 4.

Seems to tell accurate temp. It powers the heating circuit. It's a 110v unit, running on 110. I don't think it's totally fried, but not working as I expected. Is it a problem if I do not have 7 & 8 connected to anything?

 

[Hamaki]

After much feedback & troubleshooting I concluded that the unit had to be defective and convinced Amazon to allow me to return for a refund after their 30 day policy. I ordered another unit, connected it & was successful adjusting settings right from the start.