ICP 9MAC/E series Troubleshooting Manual

Contents

ICP 9MAC/E series Troubleshooting Manual Manual pdf 1 page image

-1- Replaces: New Form: ICP Eng3-12Variable Speed, ModulatingElectronic CondensingFour-Way Multipoise Gas Furnace*9MAC(TROUBLESHOOTING GUIDEINDEXPAGESafety Considerations .............................................................................. 1Instructions .............................................................................................. 1Example ................................................................................................... 2General..................................................................................................... 2Sequence of Operation ............................................................................ 2Communicating Control and Modulating Heating......................... 2Single-Stage Thermostat and Modulating Heating (AdaptiveMode)...................................................................................... 3Two-Stage Thermostat and Two-Stage Minimum/MaximumHeating .................................................................................... 4Two-Stage Thermostat and Two-Stage Intermediate/MaximumHeating .................................................................................... 4Cooling Mode.................................................................................. 5Single-Speed Cooling ..................................................................... 5Two-Stage Thermostat and Two-Speed Cooling............................ 5Dehumidification Mode .................................................................. 5Super-Dehumidify Mode ................................................................ 5Continuous-Blower Mode............................................................... 6Heat Pump Defrost.......................................................................... 6Component Test .............................................................................. 6Service/Status Code Instructions............................................................. 7Start Here ................................................................................................. 9Amber LED On Solid............................................................................ 10Improper Cooling Air Flow................................................................... 11Minimum and/or Maximum Heat Temperature Rise Too Low............ 13Secondary Voltage Fuse Open .............................................................. 14Status Code 2 - Pressure Switch Did Not Open.................................... 16Status Code 3 - Low Pressure Switch Did Not Close or Reopened ..... 17Status Code 4 - Limit Circuit Fault ....................................................... 19Status Code 5 - Abnormal Flame-Proving Signal................................. 21Status Code 6 - Ignition-Proving Fault ................................................. 21Status Code 7 - Limit Circuit Lockout .................................................. 23Status Code 8 - Gas Heating Lockout ................................................... 24Status Code 9 - Medium Pressure Switch, High Pressure Switch, orPSR Relay did not Close or Reopened ......................................... 24Status Code 10 - Polarity....................................................................... 27Status Code 1 + 2 - Blower On After Power Up................................... 28Status Code 1 + 5 - Blower Motor Lockout.......................................... 28Status Code 2 + 5 - Model Selection or Setup Error ............................ 29Status Code 3 + 5 - Gas Valve Fault ..................................................... 30Status Code 4 + 1 - Blower Motor Fault............................................... 32Status Code 4 + 2 - Inducer Motor Fault .............................................. 34Status Code 4 + 3 - Low or Medium Pressure Switch Open WhileMedium or High Pressure Switch Is Closed................................. 36Status Code 6 + 1 - Ignition Lockout.................................................... 37Cleanup and Start-Up Instructions ........................................................ 37APPENDIX A - Board Layout & Wiring Schematic ........................... 38APPENDIX B - ECM Blower Motor Description & Operation.......... 40APPENDIX C - Pressure Check Diagram ............................................ 42APPENDIX D - Static Pressure Reading Location Diagrams.............. 43APPENDIX E - Quick Reference Information..................................... 45APPENDIX F - Furnace Staging Algorithm ........................................ 46SAFETY CONSIDERATIONSInstalling and servicing heating equipment can be hazardous due togas and electrical components. Only trained and qualified personnelshould install, repair, or service heating equipment.Untrained personnel can perform basic maintenance functions suchas cleaning coils, or cleaning and replacing filters. All otheroperations should be performed by trained service personnel. Whenworking on heating equipment, observe precautions in literature, ontags, and on labels attached to or shipped with the unit, and othersafety precautions that may apply.Follow all safety codes. In the United States, follow all safety codesincluding the National Fuel Gas Code (NFGC) NFPA 54-2006/ANSIZ223.1-2006. In Canada, refer to the National Standard of CanadaNatural Gas and Propane Installation Codes (NSCNGPIC), CSAB149.1-05.Wear safety glasses and work gloves. Have a fire extinguisheravailable during start-up, adjustment procedures, and service calls.Recognize safety information. This is the safety-alert symbol .When you see this symbol on the furnace and in instructions ormanuals, be alert to the potential for personal injury.Understand the signal words DANGER, WARNING, andCAUTION, and NOTE. The words DANGER, WARNING, andCAUTION are used with the safety-alert symbol. DANGERidentifies the most serious hazards which will result in severepersonal injury or death. WARNING signifies hazards which couldresult in personal injury or death. CAUTION is used to identifyunsafe practices which may result in minor personal injury, orproduct and property damage. NOTE is used to highlightsuggestions which will result in enhanced installation, reliability, oroperation.INSTRUCTIONSThis guide uses your expertise and observations to lead you to thetrouble spot as efficiently as possible. This is only intended as aguide and should not be used blindly. Your experience and expertiseare of high value when troubleshooting this unit. Do not disregardall of your instincts.The modulating furnace control was designed with diagnosticcapabilities built in. A AMBER LED is used to flash a status codewhich will lead you to one of the sections as listed in the Index.!440 08 4001 00