Help getting the temp stable

[GPhiAce]

I am having a slight issue with the temp being stable and my fan and heater turning on and off as they please-- it seems. I would like the fan on when the temp is over 79.4 and the heater on when the temp is under 79.0, but the fan is on when the temp is at 78.5 and heater is on constantly it seems.

Where are my programs. Feel free to make any suggestions.

If Time > 12:00 Then MH1 ON
If Time > 20:00 Then MH1 OFF
If Time > 19:00 Then MON ON
If Time > 08:00 Then MON OFF
If Time > 00:00 Then RET ON
If FeedA 015 Then MJ1 OFF
If FeedA 015 Then MJ2 OFF
If Time > 11:00 Then T5_ ON
If Time > 21:00 Then T5_ OFF
If Temp < 79.0 Then HET ON
If Temp > 79.7 Then MH1 OFF
If Temp > 80.0 Then T5_ OFF
If Temp > 79.4 Then FAN ON
OSC 024/007 ON/OFF Then MJ2 ON

[jstlsn]

Try this:

If Temp < 79.0 Then HET ON
If Temp > 79.1 Then HET OFF
If Temp > 79.4 Then FAN ON
If Temp < 79.3 Then FAN OFF

You are telling the controller to turn the HET and FAN on but not telling it when to turn off.

Brad