Reef Angel Forum

My heaters are located in my sump and set to go on at 77.9 and off at 78.9, and my over temp is set to 84

I have two temp probes, one in the sump and one in the main tank. Well today the one in the tank somehow fell out, so it was reading the room temp which was 74 and the heaters stayed on.

The tank temp was actually 87 as was the sump.

So why did the temp probe in the sump not trigger the heaters to shut off due to over temp ????

I'm am desperately trying to cool the tank down now.

Which probe is defined for the overheat probe?

My guess is the tank probe that fell out.

I thought over temp applied to any temp probe

No, it only applies to one probe.
It doesn't apply to any probe because people use probes for different reasons.
I, for example, use one in sump, one in the canopy and one in my room. My controller would go into overheat everyday if I used the other probes for overheat too.
You can however code it to shutdown the heater if it goes above a certain level too.
Something like this:

Ok, so I can just add in the shut off for the second probe using that code

where would I put this code ?

Last line in your loop function above the "place custom code above here"

Thanks Lee

More importantly, what are your heaters set to?