TB7220 Ultrastat Programmable Thermostat - The Energy Conscious

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TB7220 ULTRASTAT PROGRAMMABLE THERMOSTATTROUBLESHOOTING (TABLE 10)Table 10. Troubleshooting.Symptom Possible Cause ActionDisplay does not come on. Thermostat is not being powered. Check for 24 Vac between C and Rc.Check that AAA batteries are installed correctlyand are good.Temperature settings do notchange.Heating or cooling does not comeon.Thermostat is calling for Heat(Heat on) or Cool (Cool on) butno heating or cooling is running.Heat does not turn on (Heat On issolid in the display).The upper or lower temperature limits werereached.The keypad is fully locked.Check temperature setpoints.Check ISU 0600 and 0610; modify as needed.Check ISU 0670 to change keypad lockedoptions.Thermostat minimum off-time is activated. Wait up to five minutes for the system to respond.System selection is not set to Heat or Cool. Set system Selection to correct position.System type Selection is incorrect. Check ISU 0170 and make sure correct Systemtype is chosen.Heating or cooling equipment is notoperating.Heating equipment failure.Check wiring.Check ISU 0170 and make sure correct systemtype is chosen.Verify operation of equipment in System Testmode.Check for 24 Vac at the equipment on thesecondary side of the transformer between powerand common. If voltage is not present, check theheating equipment to find the cause of theproblem.Cooling does not turn on (CoolOn is solid in the display).Fan does not turn on in a call forheat (electric furnace).Heat pump puts out cool air in theheat mode and warm air in thecool mode.Both the heating and coolingequipment are running at thesame time.Loose or broken wire connection betweenthermostat and heating equipment.Cooling equipment failure.Loose or broken wire connection betweenthermostat and cooling equipment.Fan Control in Heating is set to Gas or OilFurnace (Setting 0180).Changeover Valve (ISU 0190) is notconfigured to match the changeoverrequired by the installed heat pump.The heating equipment is not a heat pumpbut the System Type (ISU 0170) is set toHeat Pump.Heating and cooling wires are shortedtogether.Check for 24 Vac between the heat terminal (W)and transformer common. If 24 Vac is present, thethermostat is functional. Check the heatingequipment to find the cause of the problem.Check for 24 Vac between the heat terminal (W)and transformer common. If voltage is notpresent, check wire connection (loose or broken)between the thermostat and the heatingequipment.Check for 24 Vac at the equipment on thesecondary side of the transformer between powerand common. If voltage is not present, check thecooling equipment to find the cause of theproblem.Check for 24 Vac between the cool terminal (Y)and transformer common. If 24 Vac is present, thethermostat is functional. Check the coolingequipment to find the cause of the problem.Check for 24 Vac between the cool terminal (Y)and transformer common. If voltage is notpresent, check the wire connection (loose orbroken) between the thermostat and the coolingequipment.Set Fan Control in Heating to Electric Furnace(Setting 0180).Set Changeover Valve (ISU 0190) to match thechangeover required by the installed heat pump.Set System Type (ISU 0170) to match theinstalled heating and/or cooling equipment.Separate the shorted heating and cooling wires.63-2636—03 22
TB7220 ULTRASTAT PROGRAMMABLE THERMOSTATTable 10. Troubleshooting. (Continued)Symptom Possible Cause ActionHeating equipment is running inthe cool mode.Heating equipment does not turnoff and heat temperature settingis set below room temperature(Heat On is not in the display).Cannot set the system setting toHeat.Heating equipment is not a heat pump butSystem Type (ISU 0170) is set to HeatPump.Heating equipment is not a heat pump butSystem Type (ISU 0170) is set to HeatPump.System Type (ISU 0170) is set to CoolOnly.Set System Type (ISU 0170) to match theinstalled heating and/or cooling equipment.Set System Type (ISU 0170) to match theinstalled heating and/or cooling equipment.Set System Type (ISU 0170) to match theinstalled heating and/or cooling equipment.Cannot set the system setting toCool.System Type (ISU 0170) is set to HeatOnly or Heat Only with Fan.Set System Type (ISU 0170) to match theinstalled heating and/or cooling equipment.Heat On is not in the display.Cool On is not in the display.Perchlorate MaterialThis thermostat contains a Lithium battery which may containPerchlorate material.The following statement is required:Perchlorate Material—special handling may apply.See www.dtsc.ca.gov/hazardouswaste/perchlorateSystem setting is not set to Heat and/ortemperature setting is not set above roomtemperature.System setting is not set to Cool and/or thetemperature setting is not set below roomtemperature.Set the system setting to Heat and set thetemperature setting above the room temperature.Set the system setting to Cool and set thetemperature setting below the room temperature.Wait is in the display. Compressor minimum off timer is active. Wait up to five minutes for the cooling or heating(heat pump) equipment to turn on.“Screen Locked” appears on thescreen and all or some of thekeys do not respond.The keypad is fully or partially locked.Check ISU 0670 to change keypad lockedoptions.23 63-2636—03
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TB7220 Ultrastat Programmable Thermostat - The Energy Conscious

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