My honeywell thermostat (TH8321U) touchscreen's icons only work on the left side which enables me to turn might heat on and off but will not allow me to change my settings?

Try changing the batteries.

Hi,

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heatman101

Try setting the fan to Auto.

Try pushing hard and steady on the bottom, left side of the thermostat, if it unfreezes, it means that the ribbon connection from the base to the touch screen is loose. you can try to wiggle it, but usually it will not stay fixed and the thermostat must be changed.
I'm very sorry.
Sincerely,
Paul Gibson

unfortunately ur probably gonna have to replace the tstat once it stops receiving input its about shot sorry

I have not had that problem. But go yo yourhomehoneywellthermastats and the web site has question and answers. Rus

i have a vison pro th8320u and i cant get aux heat to operate also aux heat on will not come up on the touch screen.

That flame means that you heat is on and working .
Th

ac only?r and y

I am not sure of what help you need on it but here are the most common wiring on a stat
W= heat
C=Common (24V)
R=Hot (24V)
G= Fan
RC=Hot (24v for Cooling)
RH= Hot (24v for Heat)
O= Reversing Valve (Heat Pumps Only)
Hope this helps