Bryant T6-PHP, T6-PAC Troubleshooting, Error Codes, Relays, Temperature Offset After Power Cycle

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Relays

This thermostat uses latching relays. When the thermostat loses power, the relays will remain in their last position until power is restored and all relays are reset to their correct position. Out of the box, the outputs may appear to be On when the thermostat is not powered. This is normal. Output states should only be checked when the thermostat is powered.

Temperature Offset After Power Cycle

To compensate for internal heat build−up from the electronics in the thermostat, the thermostat will add an offset to the actual temperature that it measures. If the thermostat power is cycled quickly, one can witness an immediate increase in the actual temperature displayed due to this added offset. The thermostat display will return to the actual room temperature after several minutes of operation.

TROUBLESHOOTING

If the display module doesn’t power up after power is applied, check the Rc/Rh and C terminals for 24VAC. If 24VAC is present, check the voltage between Vg and V+. This voltage will be approximately 12−20VDC. If voltage is present, check the polarity to make sure it is wired correctly. The display will not power up if polarity is reversed.

If dashes appear for Option 01 in config and during reboot, the problem could be the red pigtail being wired to Rc or Rh and the black pigtail being wired to C. If so, remove the two−wire pigtail and connect to the V+ and Vg terminals.

Error Codes

“−−” − If AC/HP Control cannot properly read room temperature, display will indicate “−−” and all outputs (except fan, if on) will turn off. In the case where the installer has selected to average the local sensor and the remote room sensor, the AC/HP display will alternate between “−−” for the failed sensor and the

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Contents Installation Instructions Page Safety Considerations Table of ContentsIntroduction Power Installation ConsiderationsModels Outdoor Temperature SensorTwo−Piece Thermostat Configuration Remote Indoor Temperature SensorWiring InstallationAC/HP Control Location − T6−NAC / T6−NHP Carton ContentsElectrical Operation Hazard Install AC/HP ControlUnit Damage Hazard − Press Tabs to Remove Backplate Two−Piece Installation− Take Apart − Backplate Mounting Relays − Secure Wires to Terminal Strip − Attach Display to Backplate − Equipment Control Module on Equipment − Standoff − Cover on Equipment Control Module Single−Piece Installation − Equipment Control Module − Reattach Display Module Set AC/HP Control ConfigurationPage To Enter Configuration Mode Option 01 Equipment Type Configuration Options -SelectionOption 04 Fan G On With W/W1 Option 02 Clean Filter TimerOption 03 Fahrenheit/Centigrade Option 06 Cooling Lockout Below 55F − Remote Room Sensor − Parallel WiringOption 10 Reversing Valve Option 08 Auxiliary Heat Lockout TemperatureOption 07 Zoning Option 15 Enable Auto Mode Option 11 Deadband Setting Between Heat & CoolOption 12 Smart Recovery Option 13 Room Air Temperature Offset AdjustOption 17 Time Between Equipment Stages Option 18 Backlight ConfigurationOption 16 Maximum Cycles Per Hour Option 21 Keypad Lockout programmable models only Option 20 Outdoor Air Temperature Offset AdjustmentOption 21 Keypad Lockout non−programmable models only Page Option 26 Minimum Cooling Setpoint Option 24 Programmable/Non−ProgrammableOption 25 Number of Programmable Periods Option 30 Programmable Fan programmable models only Option 27 Maximum Heating SetpointOption 28 UV Light Reminder Page Option 44 Super Comfort Heat Option 33 Single or Two−Piece InstallationOption 41 Variable Speed Blower Option 99 Reset to Factory Defaults System START−UP and Checkout Energy Star Default Schedule Final SettingsPage Vacation programmable models only TimersOperational Information Defrost Cycle Timer Ten−Minute Staging Timer Auto Changeover Equipment On IndicatorsHeat/Cool Setpoints Desired Temperature Three−Minute Minimum on TimeDry Contact Emergency Heat ModeProgrammable Fan programmable models only Relays TroubleshootingError Codes Temperature Offset After Power CyclePage Equipment Configuration Outputs − Equipment Configuration Outputs − Display to Equipment Control Module Connection Wiring DiagramsWiring DIAGRAMScont − Fan Coil shown with Auxiliary Connection #1 − Fan Coil with Air Conditioner Indicates connection may not be required/available − Furnace with Air Conditioner − Thermostat with Dry Contact Control for Run Time Outdoor Sensor Remote Room Air Conditioner − Single−stage Furnace with Air Conditioner and Split Power Mode Settings Thermostat Configuration RecordConfiguration Options Option Keypad Lockout Page Catalog No IIT6-PAC-03