Honeywell TB6575B1000/U Installation Instructions - Page 18

TB6575/TB8575 DIGITAL FAN COIL THERMOSTATS Table 8. Troubleshooting. (Continued) Symptom Possible Cause Action Cooling does not turn Cooling equipment failure. For TB6575A/B: on (Cool On is solid in 1. Check for 120/240 Vac at the equipment between power and the display). common, (terminals L and N). 2. Check for 120/240 Vac between the cool (Y) and common (N) terminals. If 120/240 Vac is present, the thermostat is functional. For TB875A: 1. Check for 24 Vac at the equipment on the secondary side of the transformer between power and common (terminals R and C). 2. Check for 24 Vac between the cool terminal (Y) and trans- former common. If 24 Vac is present, the thermostat is func- tional. Loose connection or broken wire between thermostat and cooling equipment. If voltage is present, check the cooling equipment to find the cause of the problem. For TB6575A/B: Check for 120/240 Vac between the cool (Y) and common (N) terminals. For TB875A: Check for 24 Vac between the cool terminal (Y) and transformer common. If voltage is not present, check the wire connection (loose or broken) between the thermostat and the cooling equipment. Fan does not turn on Wiring or connection in a call for Heat. failure Check wiring and make sure the connection is correct. Cannot select fan speed. Fan Control Type selection is incorrect. Check that the Installer Setup code #9 (Fan Control) value is set to zero (0). Heating equipment is Incorrect System Type running in the Cool configured. mode. Check that the Installer Setup code #2 (System Type) value matches the installed heating and/or cooling equipment. Heating equipment does not turn off and heat temperature setting is set below room temperature (Heat On is not in the display). Incorrect System Type configured. Check that the Installer Setup code #2 (System Type) value matches the installed heating and/or cooling equipment. Cannot set the system System Type (Installer setting to Heat. Setup code #2) is set to Cool Only (value = 1). Set the Installer Setup code #2 value to match the installed heating and/or cooling equipment. Cannot set the system System Type (Installer setting to Cool. Setup code #2) is set to Heat Only (value = 0). Set the Installer Setup code #2 value to match the installed heating and/or cooling equipment. Heat On is not in the display. System Type setting is not Set the Installer Setup code #2 to Heat and set the temperature set to Heat and/or the setting above the room temperature. temperature setting is not set above the room temperature. Cool On is not in the display. System Type setting is not Set the Installer Setup code #2 to Cool and set the temperature set to Cool and/or the setting below the room temperature. temperature setting is not set below the room temperature. Remote sensor does Incorrect ISU code. Set the Installer Setup code #4 to Remote (value = 1). not display temperatures Sensor is not compatible. The remote sensor must be TR21 or compatible 20K NTC. Remote Setback does Incorrect ISU code. not activate Make sure the NO/NC and timer selection is correct. Check the value selected for ISU code #19. Remote setpoint error. Make sure the remote setback setpoint is correct for energy saving usage. 62-0311-05 18