ACIII 'U' undefined

[Sisterlimonpot]

This weekend I hooked up my aciii and I'm having problems with the temp settings. I have the heaters coming on at 79.7 and shutting off at 80.0, for the first day it was working fine heaters turn on and turn off normally the character display for the temp was an up and down arrow respectively. However when I go to the main screen today there was a U in its place.

I took the temp probe out of the water to let the temp drop and the U changed to an up arrow when temp fell bellow 79.7. Is this normal to see the U there?

The only thing I can think of to get rid of the U is to add 2 more lines of code stating:
if temp = 79.8 then htr ^ on
and
if temp = 79.9 then htr ^ on

Is this the only fix or am I missing something?

 

[Deleted member 143833]

Don't worry about the 'U'; it means that the controller cannot figure out if it should be ON or OFF and should clear itself. I have a full description with scenarios that you will see it on the Q&A page of my website.

 

[Gold Stripe]

Sounds like a programing issue. What programing statements do you have set for your heater? What is probaly happening is you have statements similar to:

temp < 79.7 then het on
temp > 80.0 temp off. So when the temp is 79.9, ACiii isnt sure what you want it to do.

 

[ciphros]

Sounds like a programing issue. What programing statements do you have set for your heater? What is probaly happening is you have statements similar to:

temp < 79.7 then het on
temp > 80.0 temp off. So when the temp is 79.9, ACiii isnt sure what you want it to do.

No, it's not a programming issue. It just means that the controller may have had a power bump for some reason, and the temp is currently between the programmed values. This leads to the controller not knowing if the device is on or off. It will stay listed as U until it hits either the upper or lower setting that will cause the controller to know it needs to turn the heater on or off. After that, it will again display the up or down arrow according to what the actual state of the device is. It's just the initial confusion due to the temp being in a range where the device COULD be on OR off.

 

[Sisterlimonpot]

Thank you guys.
Something else:

I finally figured out how to get the ac3 to talk to my home computer. But I can't figure out how to get my droid to access it. Can someone post a link on step by step instructions on how to get this to work?

Thanks