EcoNet and Flash Codes - MyRheem.com

1 EcoNet and Flash CodesInverter ProductThe error Codes below will be displayed at the EcoNet Control Center under Service window / Current Faults or in the Fault History and will be time & datestamped. VSODU (Variable Speed Outdoor Unit Control EcoNet control board) fault code is what will be displayed on the VSODUEcoNeterrorcode at ControlCenterVSODUF ault CodeDescriptionPossible Resolution(s)EV2 Drive LED CodeA900_O Inverter Fault Identity Fault The inverter drive itself is notprogrammed and is not fieldserviceable. This fault should not occur in thefield. Replace s unlikely to displayanythingT901_O Inverter Fault Compressor Overcurrent Compressor is pulling morecurrent than allowed Compressor Shorted to Ground Check resistance of windings toground.

2 Wiring to compressor or molded plugdamaged Inspect compressor wiringharness. Wire not secure on U, V, or W Checkconnections. Defective Drive Replace DriveYellow 1 or 3 FlashesOrRed 4 FlashesT902 Inverter Fault Envelope Protection Compressor current outside ofpredetermined envelope forRPM s Will display 31 at VSODU at time offault Will return to operation aftertime delay Must occur 15 times in a 24 hourperiod to be displayed in controlcenter fault history Verify refrigerant charge, often relatedto overchargeT903_O Inverter Fault PFC Overcurrent PFC (Power Factor Correction)module is detecting high currentinternally Check Choke Replace Choke If Choke doesn t work, check driveEcoNet and Flash CodesInverter ProductT904_O Inverter Fault DC Bus Overvoltage Verify line voltage toequipment/drive does not exceedmaximum allowable voltages Incoming - >285 VAC DC Bus - >385 VDC Correct incoming line voltage issue Replace DriveYellow 7 FlashesT905_O Inverter Fault DC Bus Undervoltage DC Bus voltage has droppedbelow acceptable voltage Incoming Voltage <187 VAC DC Bus Voltage <175 VDC Fault will reset when voltage isreturned.

3 Early VSODU firmware(Before VSODU Rev 41) may notproperly reset this fault. UpdateVSODU firmware to later revision. Can occur with power flicker due tostorms, will reset when voltagereturns after delay. Check Incoming Line Voltage to DriveYellow 8 FlashesA906_O Inverter Fault AC Input Overvoltage Incoming Voltage >275 VAC Verify Incoming voltage to Drive bymeasuring voltage at L1 to L2 Yellow 10 FlashesA907_O Inverter Fault AC Input Undervoltage Incoming voltage <170 VAC Verify Incoming voltage to Drive bymeasuring voltage at L1 to L2 Yellow 9 FlashesT908_O Inverter Fault PIM Over-temp Indicates the PIM (Power InverterModule) on the drive isoverheated. May stop or fold backcompressor RPM Check Outdoor fan operation Check Condenser coil for cleanliness Check Drive Heat SinkYellow 4 or 18 FlashesT909_O Inverter Fault PFC Over-temp Indicates the PFC (Power FactorCorrection) is overheated.

4 May stop or fold backcompressor RPM Check Outdoor fan operation Check Condenser coil for cleanliness Check Drive Heat SinkYellow 5 or 19 FlashesEcoNet and Flash CodesInverter ProductA910_O Inverter Fault Lost Rotor Position Compressor rotor not matchingspeed command Measured via Back EMF Verify Compressor Connections at U,V, W and Molded plug System Grossly Overcharged Compressor Tight or Locked Drive Defective Solder BridgingYellow 2 FlashesT911_O Inverter Fault Current Imbalance Compressor Current Imbalance Verify Compressor Connections at U,V, W and Molded plug Check Compressor Windings forsignificant differences in 14 FlashesA912_O Inverter Fault Micro Fault Micro on Drive faulted Hard Reset on Drive If Hard Reset fails, replace DriveRed 13 FlashesA913_O Inverter Fault -PIM Sensor Open Power Inverter Moduletemperature sensor is open Replace DriveRed 2 FlashesT914_O Inverter Fault DC Voltage Low DC Bus Voltage is running low Check Incoming Line Voltage at L1 toL2 Voltage on DC Bus is generally 325 to380 VDC.

5 PIM on Drive Defective Replace DriveYellow 17 FlashesT915_O Inverter Fault Discharge Temp Compressor DischargeTemperature has exceed 225 Fdegrees and compressor mayfold back until temperature isbelow 200 F Verify Operating Superheat andCharge Check Reversing Valve for leakagefrom Discharge to suction Check DLT Sensor Connection toDrive Verify DLT sensor resistanceYellow 6 FlashesEcoNet and Flash CodesInverter ProductA919_O Inverter Fault PFC/DSP Comm Fault Drive lost internal communicationbetween PFC and DSP Check Mod Bus Cable Hard Reset of Drive If fault persists - replace driveRed 9 FlashesA920_O Inverter Fault COM/DSP Comm Fault Drive lost internal communicationbetween PFC and DSP Check Mod Bus Cable Hard Reset of Drive If fault persists - replace driveRed 8 FlashesA921_O Inverter Fault PFC Temp Sensor Open Sensor to PFC Is either low oropen Verify proper airflow over theheatsink of the drive.

6 Remove Check the compressor is operatingwith in specified limits. 3. If the problem still persists, replacethe 1 FlashT922_O Inverter Fault PIM Temp Foldback Drive has folded back as a resultof PFC temperature Verify proper airflow over theheatsink of the drive. Remove Check the compressor is operatingwith in specified limits. 3. If the problem still persists, replacethe 21 FlashesA925_O Inverter Fault Compressor Model Unkown Drive size and model data carddo not match Incorrect Memory Card has beeninstalled Incorrect Inverter Drive has beeninstalledYellow 22 FlashesEcoNet and Flash CodesInverter ProductA927_O Inverter Fault DLT sensor Open Discharge Line TemperatureSensor is open Check DLT sensor connection to drive Check DLT sensor resistance to tempRed 3 FlashesA928_O Locked This is an indication that thesystem is locked out and needs tobe reset Check fault history for cause oflockout condition at control center Address fault as indicated in historyA929_O 240 VAC Missing or CommFailure(Formerly Comm Failure)

7 Drive is either not powered orthere is a problem with the modbus cable between VSODU andDrive Verify Line voltage to unit is on and ismeasured by reading line voltage intodrive at L1-L2 Check Modbus cable between VSODUand Drive. Closely Examine pins inconnectors Hard Reset of Drive Replace DriveRed 11 FlashesA950_O Configuration Data RestoreFailure Firmware in VSODU is corrupt Replace Firmware in VSODUA951_O Memory Card Data WriteFailure VSODU is unable to write data tomemory card Possible Damage to solder joints onback of memory card socket onVSODU Replace VSODU Replace Memory Card also if VSODU does not resolveEcoNet and Flash CodesInverter ProductT952_O Outside TemperatureThermistor Failure Outdoor Temperature Thermistoris either Open, Shorted or Low Check connection at VSODU Verify leads to sensor are notpinched.

8 Or damaged Check sensor resistance/tempA953_O Coil TemperatureThermistor Failure(Formerly called Evap TemperatureThermistor) Coil Temperature Thermistor iseither Open, Shorted or Low Unit will run in cooling mode, butwill not run in heating mode Check connection at VSODU Verify leads to sensor are notpinched, or damaged Check sensor resistance/tempA954_O suction TemperatureThermistor Failure suction Thermistor is eitherOpen, Shorted, or Low Unit will run in cooling mode butwill not run in heating mode Check connection at VSODU Verify leads to sensor are notpinched, or damaged Check sensor resistance/tempT955_O Compressor TemperatureThermistor Failure Sump Thermistor is either Open,Shorted, or Low Stator heat will not operate Check connection at VSODU Verify leads to sensor are notpinched.

9 Or damaged Check sensor resistance/tempA956_O suction Pressure SensorFailure suction Transducer is either,shorted, grounded or open oroutside of acceptable range Check Transducer using formula PSIA= 375*(DCVout/DCVin) PSIG= Verify Connections at VSODU andTransucerT957_O Low Refrigerant Pressure Pressure at Transducer has fallenbelow settings. 50 PSIG for Cooling and 15 PSIGfor Heating modes Check Refrigerant Charge Check for Restrictions in liquid orsuction lines, drier, strainers and Flash CodesInverter ProductA957_O Low Refrigerant Pressure System has tripped the lowpressure threshold 3 times in onecall. Unit will be locked out for onehour Check Refrigerant Charge Check for Restrictions in liquid orsuction lines, drier, strainers High Refrigerant Pressure System High pressure switch hasopened.

10 Check Refrigerant Charge Check connection of HPS to DriveYellow 20 FlashesA958_O High Refrigerant Pressure System High pressure switch hasopened 3 times and is locked outfor one hour Check Refrigerant Charge Check connection of HPS to DriveYellow 20 FlashesT959_O Compressor Heater On(Normal Operation)Flashing Indicated only at control center Often times this is a result of shortcycling due to envelope protection orpressure switch trips. Usually related to overchargeconditions Compressor Sensor not in correctlocation or not making good surfacecontact with compressor. Service FirmwareT960_O Compressor LubeProtection Compressor Temperature fellbelow saturated refrigerantpressure indicating liquid isreturning to compressor Check refrigerant charge Can happen in extreme coldtemperatures when compressor slowsdown from overdriveEcoNet and Flash CodesInverter ProductT961_O Compressor DischargeTemperature High Folding back due to highdischarge temperature When Discharge temperature exceeds225 F, Compressor will slow down tobring discharge temperature downbelow 200 F.