How to Use Your ClimateMaster Thermostat

By Dave Hartzell, Master HVAC, IGSHPA Accredited, ClimateMaster GeoElite dealer, 47 years in the trade. Hartzell’s Heat & Air, Kingfisher, Oklahoma. Updated October 3, 2026.

Which ClimateMaster thermostat do I have?

Look at the faceplate or the settings menu for the model. In my job records at Hartzell’s Heat & Air since 2017, the iGate ATC32 family shows up on 20+ ClimateMaster jobs, far more than any other ClimateMaster thermostat. The iGate 2 started showing up on my jobs in 2024. If somebody told you that you have a “TC32,” they almost certainly meant the ATC32. And IntelliZone 2 is a WaterFurnace zoning thermostat, not a ClimateMaster one, so its menus will not match anything below.

What do the five modes on a ClimateMaster thermostat do?

Off runs nothing. Heat pulls heat out of your ground loop. Cool puts your house heat back into the loop. Auto switches between the two on its own, which is handy in an Oklahoma spring when it is 40 at sunrise and 80 by supper. Emergency Heat shuts the compressor off and runs only the backup electric heat. ClimateMaster’s own manual says emergency heat is “significantly more expensive to operate than the heat pump compressor, and should not be selected unless the heat pump compressor is not operational.” I agree. If you are on Emergency Heat because the geothermal side quit, that is the day to call me, not next week.

How do I set a schedule on a ClimateMaster iGate thermostat?

On the ATC32U03, press MENU, then PROGRAM. It runs a 7-day schedule with four events a day: Wake, Leave, Return and Sleep. Out of the box those are set to 70 heat and 78 cool for Wake and Return, and 62 heat and 82 cool for Leave and Sleep. Change any of them to fit your house. On the iGate 2, you can look at the schedule on the thermostat, but ClimateMaster has you make permanent schedule changes in the myUplink app. The thermostat only joins a 2.4 GHz Wi-Fi network, so check that first if it will not connect.

Can I see my geothermal loop temperature on a ClimateMaster thermostat?

On the ATC32U03, yes. From the home screen, hold the left arrow to open System Status. Depending on the unit, it shows entering water, leaving water and flow rate, along with air and refrigerant temperatures. Readings it cannot get show N/A. On the iGate 2, those loop readings are a technician view in the myUplink app and web portal, not a homeowner screen. Write the numbers down if you call me. They tell me a lot before I ever leave Kingfisher.

What does it mean when my ClimateMaster thermostat shows a fault?

When the unit locks out, the ATC32U03 switches to a Service Needed screen with the model, serial number, your contractor’s phone number and the fault, like E2 HIGH REFRIG PRESSURE or LT1 LOW WATER TEMP. It keeps the active fault and the five before it. The iGate 2 shows a banner alert, and if you registered it in myUplink, it emails you and sends a phone notification. My ClimateMaster fault code guide explains each code. Please do not clear the fault history. That list is the first thing I read when I get there.

A thermostat problem is not rare on geothermal. Thermostats came up 45+ times in my geothermal service records since 2017. The loop itself is a different story. In 700+ geothermal jobs I have never replaced a loop field, so a LOW LOOP PRESSURE alert usually means air or a pump issue, not a dead loop.

“We don’t replace the loops. They last.”Dave Hartzell, Hartzell’s Heat & Air, Kingfisher

How do I reset the filter reminder?

On the iGate 2, change the filter, then go to the FILTER screen and press RESET to restart the timer. That is the one reset I want every homeowner to use.

What does a ClimateMaster service call cost in Oklahoma?

At Hartzell’s Heat & Air, the geothermal diagnostic is $348 flat. Weekday, night or weekend, it is the same $348, and it is the same for my maintenance plan members. I check loop pressure, refrigerant charge, the desuperheater, controls and the heat exchanger, and you get a written report and a quote before I leave. I am IGSHPA Accredited and a ClimateMaster GeoElite dealer, with 4.8 stars and 300+ Google reviews. I work geothermal across Oklahoma out of Kingfisher.