trane xl16i air conditioner doesnt cool to setting

[IndoorAir]

We love our Trane, it is quiet and my wife no longer has a drafty kitchen. However, it just passed the 1 year warranty and entered our second cooling season in Chicago. We have the thermostat set at 78 degrees but it seems to run at 80 or 81 actual temperature for most of the afternoon and early evening. What has to happen to get the high cool setting to come on and bring the temperature down? How can you tell when the unit is running in high cool mode or low cool mode?

[green jumper]

Thermostat makes the call, depending on the thermostat it should say stage 1/2 cooling on it when running. Thermostat makes the decision based on how long the units ran after X amount of time switch to second stage or the gap of temp it has to make up.

add: the xl16 is a single compresser if it has issues cooling first stage it will have issues cooling in second stage. Call a pro and be reasonable with him sometimes if your nice they'll come out for warranty if its a bit after just to make a good impression.

[JoeSix]

If you have a two-stage thermostat (no point not having one IMHO if you have a two stage furnace or A/C), it should tell you if it's running on low or high (sometimes 1 or 2).

If you have a single stage thermostat, then usually it is set up so that the unit runs on low for a certain amount of time and then switches to high until the thermostat demand is met. This "works" but loses one of the major benefits of a 2-stage system (the ability to have long run times on low or switch from high back down to low and have continuous operation when the demand exceeds the low stage capacity).

Did it do this last year, too, or is this a change in behavior?

[green jumper]

Trane/ A/S units must have a 2 stage cool tstat to operate, only a 2 stage furance has the ability to run off a single stage tstat.

[IndoorAir]

Nothing I can find shows that the unit is in HIGH or LOW mode.

I have looked through the manual and at the thermostat and neither seems to show either HIGH or LOW for either the HEAT or COOL settings.

The manual is for a TCONT802AS32DA and on the back of the thermostat it has TCONT802AS32DAA which says it controls the "two step scroll cooling unit".

[Twilly]

Twilli says call installing company