Trane Direct-Fired Indoor and Outdoor Make-Up Air Units manual Fault Code Safety Circuit Open

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Diagnostics

–Yes. This signal is fed to the signal conditioner. Disconnect the wires from the signal conditioner's input signal terminals and measure the voltage on the wires. Is it the same as the voltage coming from the controller?

–No. There is an open in the wiring from the controller output. Correct wiring and reconnect the wires to the terminals on the signal conditioner. Be sure the wire from the controller's ground terminal is connected to the signal conditioner's ground terminal.

–Yes. Continue.

5.Is there 24VAC on the signal conditioner power terminals?

–No. Determine cause and rectify.

–Yes. Continue.

6.Is there twice the DC voltage on the signal conditioner's output terminals as there is on the signal conditioner's input terminals?

–No. Replace the signal conditioner.

–Yes. Continue.

7.Is the DC voltage on the modulating valve terminals the same as the DC voltage on the signal conditioner's output terminals?

–No. There is a break in the wiring between the signal conditioner and the modulating valve terminals. Determine cause and rectify.

–Yes. The electronics are working to this point. Continue.

8.Is there sufficient temperature rise for the amount of outside air that is being delivered to the space?

–No. Follow the instructions in this manual for placing the unit in Manual damper control mode. Adjust the Man. Vent setpoint to 20% outside air. Is there sufficient temperature rise for the amount of outside air that is being delivered to the space?

–No. Contact the factory.

–Yes. Continue.

–Yes. Continue.

9.Verify there is sufficient inlet gas pressure. Verify the modulating valve is properly adjusted. Verify the burner orifices are clear of obstruction. Contact the factory.

FAULT CODE: Safety Circuit Open

PROBLEM:The controller has detected a failure in the safety circuit.

SOLUTION: If fan is not running (check prior alarm log)

1.Is there a prior alarm such as Unit On/Fan Off or Airflow Sw?

–Yes. See the Diagnostic section for the previous alarm.

–No. Continue.

2.Set Unit Mode to Manual. Did fan start?

MUA-SVP01A-EN • Direct-Fired Indoor and Outdoor Units

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Contents January Controls Programming GuideOverview Networking Direct-Fired Indoor and Outdoor Units MUA-SVP01A-EN Contents Contents MDT Controls Unit Operating ModesMRT-Pro Controls MRT ControlsUnit Operating Modes MRT-Expert Controls Unit Operating Modes General Burner Control Heating ModeHeating/Ventilating/Cooling Operating Modes Unit Operating Modes Ventilation Mode M P E R a T U R E S E Cooling ModeDamper Control Modes Manual ModeMixed Air Temperature Mode Building Pressure Mode 100% Outside Air FunctionsMinimum Ventilation FreezestatDirect Acting User Configured PID Control85ºF Direct acting Reverse ActingReverse acting Multiplexed Inputs Unit ResetsClock Set Fault Code Low Discharge Temperature DiagnosticsCritical Fault Codes Diagnostics Direct-Fired Indoor and Outdoor Units MUA-SVP01A-EN Fault Code Safety Circuit Open SOLUTIONIf fan is running check prior alarm log Fault CODEBurner StatusFault Code Burner Hand Fault Code Flame Failure Diagnostics Non-Critical Fault CodesSolution If fan is not running Fault Code Unit off/Fan onSolution If fan is running Solution If fan/motor is not running Fault CODEUnit on/Fan offSOLUTIONIf fan/motor is running Fault Code Check Airflow Switches SOLUTIONIf clogged filter switch is closing Fault Code Clogged Filter SwitchSOLUTIONIf setpoints are misadjusted Fault CODEEnergy Save ModeSolution If OAT, RoomT or DAT are such that heat is required SOLUTIONIf setpoints are not misadjustedDiagnostics SOLUTIONIf heat is desired Fault CODEInsufficient OASolution If setpoints are misadjusted SOLUTIONIf less outside air is desired Diagnostics Unit Modes Hotkey Menu SelectionMenu Selection Tree for BACview SET Points Hotkey Menu SelectionResets Hotkey Alarm HotkeyAlarm History 64 Most Recent Status Menu HotkeySchedules Hotkey User Configurable Output HotkeyHelp Hotkey Clockset HotkeyFuel Select Hotkey Ohms Thermistor Output Curve Thermostat Output CurveAirflow station layout Airflow Station LayoutNetwork Communication Zone 583 Controller SpecificationsRnet MRT-Pro or Room Air sensor Zone 583 Controller SpecificationsNon-recirculating with evap Dfoa and Dfia model diagram Typical Wiring SchematicTypical Wiring Schematic Recirculating Dfoa and Dfia model diagrams Recirculating Dfoa and Dfia model diagram Typical Wiring Schematic Trane
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