Carrier 58MVP Troubleshooting Manual

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troubleshooting guide

Carrier 58MVP Troubleshooting Manual Manual pdf 1 page image

58MVPVariable-Speed 2-StageElectronic Condensing FurnaceTroubleshooting GuideINDEXPAGEInstructions .....................................................................................1Example ..........................................................................................1Sequence of Operation................................................................2-4Self-Test Mode..........................................................................2Heating Mode............................................................................2Heating Mode-Two Stage.........................................................2Emergency Heat Mode..........................................................2-3Cooling Mode ...........................................................................3Heat Pump Mode ......................................................................3Continuous Fan Mode ...........................................................3-4Component Test ........................................................................4Bypass Humidifier Mode..........................................................4Dehumidification Mode ............................................................4Zone Mode ................................................................................4Start Here........................................................................................5Service Label/Fault Code Instructions .......................................6-7Improper Operation With No Flashing Fault Code ......................8Not Enough Cooling Airflow ........................................................9High-Fire Temperature Rise Too Low (Cold Blow) ..................10LEDs 1, 2, 3, or 4 On Solid...................................................10-11RED LED2 Flashing ....................................................................11Fault Code 11—No Fault in Recent History Display ................12Fault Code 12—Blower Calibration Lockout........................12-14Fault Code 13—Limit Switch Lockout..................................14-15Fault Code 14—Ignition Lockout................................................16Fault Code 21—Invalid Model Selection....................................17Fault Code 22—Set Up Error......................................................17Fault Code 23—Invalid Blower Airflow Selection...............18-19Fault Code 24—Secondary Voltage Fuse Is Open................19-20Fault Code 31—High-Pressure Switch Fault.........................20-22Fault Code 32—Low-Pressure Switch Fault .........................22-24Fault Code 33—Limit Switch Fault.......................................24-25Fault Code 34—Ignition Proving Fault .................................25-26Fault Code 41—Blower Outside Valid Speed Range ...........26-27Fault Code 42—Inducer Outside Valid Speed Range...........27-29Fault Code 43—Pressure Switch Calibration Fault...............29-30Fault Code 44—Blower Calibration Fault.............................30-31Cleanup and Start-Up Instructions ..............................................31APPENDIX A—Board Layout & Wiring Schematic ...........32-33APPENDIX B—Isolation Circuits ..............................................34APPENDIX C—Pressure Check Diagram ..................................34APPENDIX D—Quick Motor Test Procedure ......................35-37APPENDIX E—Variable-Speed Condensing Furnace DuctStatic and Blower Operation.............................................38-42APPENDIX F—Quick Reference Information ...........................43APPENDIX G—Thermostat Staging Algorithm ...................44-45INSTRUCTIONSThis 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 andexpertise are of high value when troubleshooting this unit. Do notdisregard all of your instincts.The microprocessor furnace control was designed with diagnosticcapabilities built in. LEDs are used to flash a fault code which willlead you to 1 of the subsections as listed in the Index.You should ALWAYS begin in the START HERE subsection(see Index for page number) which will guide you to theappropriate subsection where a minimal number of steps will beused to correct the problem. If you are very experienced at howthis furnace operates and you suspect the problem is either theblower motor, inducer motor, or furnace control board, you can usethe quick motor test procedure at the end of the troubleshootingguide to isolate the problem or direct you to appropriate section inmain troubleshooting guide.Once in a subsection, read the statement or question. A statementwill have a number in the "GO TO" column. Do whatever thestatement says, then proceed to step indicated in the "GO TO"column.If the step is a question (a question will have a number in the"YES" or "NO" column), answer it "YES" or "NO." If the answeris "YES," go to step indicated in "YES" column. If the answer is"NO," go to step indicated in "NO" column.Let’s try our guide out using the EXAMPLE section below, andsee how it works. Suppose that the problem is a defectivelow-pressure switch (for example will not make). This is aninternal problem and cannot simply be seen. We go to the STARTHERE section to Step 1.EXAMPLEStart Here SectionSTEP YES NO GO TO1. Step 1 tells us to record status of LEDs 1-4 and go to Step 2. — — 22.Step 2 asks the question, "Are any LEDs flashing?". If low-pressure switch wasdefective, a low-pressure switch fault code would be flashing, so the answer is"YES." We go to Step 5.5 3 —5.Step 5 asks the question, "Is RED LED2 flashing?". If low-pressure switch wasdefective, a low-pressure switch fault code would be flashing, so the answer is"NO". We go to Step 7.6 7 —7. Step 7 tells us to go to low-pressure switch fault subsection. — — INDEXManufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.Book 1 4Tab 6a 8a PC 101 Catalog No. 535-894 Printed in U.S.A. Form 58MVP-1SM Pg 1 4-95 Replaces: New