This article will guide you through troubleshooting when a customer is calling in to troubleshoot cooling issues with a TS150 thermostat. This is for situations where there are true performance issues and not when the customer is requesting a temporary override to lower the cool set point lower than it is typically running at.

Troubleshooting Steps

1. Locate the TS101 Thermostat 
   1. If you’re unable to locate, reference Commissioning Paperwork. 
2. Check that the power LED is illuminated. 
   1. If there is no power LED, access the power issues article. 
3. Is there physical damage? 
   1. If the thermostat or the internal components are damaged, we will need to service it with a technician. 
      1. If the internal wiring is damaged, the customer’s facilities team will need to resolve. 
      2. If the thermostat unit itself is damaged, we will need to schedule a technician to service the device. 
4. Check the thermostat’s mode and verify it is in either “cool” or “auto”. 
   1. To check at the thermostat physically, check to see if the “cool” LED is illuminated 
   2. To check within GEM, you can go to RTD to check current status. 
5. Check Cool Set Point. 
   1. Verify that the Override Status within GEM is not related to Demand Response leading to a temporarily adjusted setpoint. If it is, educate the customer on this setting. 
6. Confirm the Dipswitch settings of the thermostat. You can compare what the current dipswitches are against the commissioning paperwork as long as they have not replaced the HVAC unit since installation. You can check the dipswitches two separate ways: 
   1. Open the thermostat and verify that they are set up properly. 
   2. Within GEM, toggle to the Testing Module and check the Dip Switches set for the thermostat. 
7. Inspect the wiring by opening the thermostat.  
   1. To open, pinch the front plate by applying pressure at the top and bottom of the face plate and squeezing towards each other. Pull forward to remove it from its backplate. You should have a wire coming into the thermostat for the R in the top right as well as over to the RH/RC with a jumper in between. Each wire should be firmly tightened in the terminal.
   2. If there is no wire coming into the thermostat for the R slot, we will need to coordinate with the site how we will address the power issue to the thermostat. We will either need the site to run an R wire from the HVAC system or schedule someone to go out and run a transformer to the thermostat. 
   3. If there is no jumper between RH & RC, we will need to  place one here. 
8. Do they have a supply probe? 
   1. Check history of supply probe performance to see if the HVAC system is performing poorly within the data tab. If the HVAC is performing poorly, advise the site to service their HVAC unit to address the cooling issue. 
9. Check wiring voltage 
   1. Use a multimeter to verify that we have 24V provided by the thermostat when operating. This should be R & C wires. 
   2. If R & C is showing 24V, test the voltage being received by the unit itself through the wiring. Put the thermostat in a cool test and test the wiring with a multimeter between: 
      1. Heat Pump: This depends on the O or B setup of the thermostat. Work with the HVAC technician to determine the settings of the thermostat and then test either the W & C wires or the Y & C wires, whichever is appropriate. When in a cool test, you should set it ~24V. If it is ~24V, then the thermostat is providing power to the unit. If not, then there is either fault in the wiring or a faulty thermostat that needs to be replaced. 
      2. Traditional: The Y & C wires. If it is ~24V, then the thermostat is providing power to the unit. If not, then there is either fault in the wiring or a faulty thermostat that needs to be replaced. 

Symptom

• Cool Set Point not being reached 
• Cool not turning on 
• Blowing warm air incorrectly 
• TS-150 cooling issues