The purpose of this article is to show you how to see the sensor temperatures, EEV position, current alarm status and recover the error log history on the main board. 

Follow the steps provided for viewing these options. 

1.Locate the SW3 Check Button 

On the main board you will find a button labeled SW3 / Check. It is located on the side of the DSP1 display. 

                                                                      Shown on schematic

2. Advancing the display through settings

Each time the SW3 Check button is pressed every two seconds will advance to the next mode display. The modes are from #1-#23. The modes are all listed on the schematic attached to the control panel cover. 

3. How to read the DSP1 Display when advancing the SW3 Check button

Press the SW3 Check button for 2 seconds and it will display the unit tonnage.

                       For Example, if the unit is a GCC120A4EHB3- which is a 10 ton it will display like so:

Press the SW3 Check button again for 2 seconds and it will display the T1 Temperature

Each time the button is pressed for 2 seconds it will advance to the next mode on the list. If you want to advance to the current alarm you will need to advance down to 14.

The display will store 5 total error codes. The codes will be the last five alarms received. Each new alarm will replace the last oldest error received. 

When the display reach's 23 it is at the end and will start at the top again. 

4. Error Code

For a list of error codes click the link below.

Foundation- Medium- Main Board display error codes list – Trane Commercial HVAC Help Center

WARNING:

Information in this article is intended for use by individuals possessing adequate backgrounds of electrical and mechanical experience and who comply with all federal, state, and local laws, rules, orders, or regulations related to the installation, service, or repair of a heating or central air conditioning product. Any attempt to install, service, or repair a heating or central air conditioning product may result in personal injury and/or property damage. The manufacturer or seller cannot be responsible for the interpretation of the information contained herein, nor can it assume any liability in connection with its use.