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Carrier 58MVP Troubleshooting Manual

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58MVP

Variable-Speed 2-Stage

Electronic Condensing Furnace

Troubleshooting Guide

INDEX

PAGE

Instructions .....................................................................................1

Example..........................................................................................1

Sequence of Operation................................................................2-4

Self-Test Mode..........................................................................2

Heating Mode............................................................................2

Heating Mode-Two Stage.........................................................2

Emergency Heat Mode..........................................................2-3

Cooling Mode ...........................................................................3

Heat Pump Mode......................................................................3

Continuous Fan Mode...........................................................3-4

Component Test........................................................................4

Bypass Humidifier Mode..........................................................4

Dehumidification Mode............................................................4

Zone Mode................................................................................4

Start Here........................................................................................5

Service Label/Fault Code Instructions.......................................6-7

Improper Operation With No Flashing Fault Code......................8

Not Enough Cooling Airflow ........................................................9

High-Fire Temperature Rise Too Low (Cold Blow)..................10

LEDs 1, 2, 3, or 4 On Solid...................................................10-11

RED LED2 Flashing....................................................................11

Fault Code 11—No Fault in Recent History Display ................12

Fault Code 12—Blower Calibration Lockout........................12-14

Fault Code 13—Limit Switch Lockout..................................14-15

Fault Code 14—Ignition Lockout................................................16

Fault Code 21—Invalid Model Selection....................................17

Fault Code 22—Set Up Error......................................................17

Fault Code 23—Invalid Blower Airflow Selection...............18-19

Fault Code 24—Secondary Voltage Fuse Is Open................19-20

Fault Code 31—High-Pressure Switch Fault.........................20-22

Fault Code 32—Low-Pressure Switch Fault .........................22-24

Fault Code 33—Limit Switch Fault.......................................24-25

Fault Code 34—Ignition Proving Fault .................................25-26

Fault Code 41—Blower Outside Valid Speed Range...........26-27

Fault Code 42—Inducer Outside Valid Speed Range...........27-29

Fault Code 43—Pressure Switch Calibration Fault...............29-30

Fault Code 44—Blower Calibration Fault.............................30-31

Cleanup and Start-Up Instructions ..............................................31

APPENDIX A—Board Layout & Wiring Schematic ...........32-33

APPENDIX B—Isolation Circuits ..............................................34

APPENDIX C—Pressure Check Diagram..................................34

APPENDIX D—Quick Motor Test Procedure......................35-37

APPENDIX E—Variable-Speed Condensing Furnace Duct

Static and Blower Operation.............................................38-42

APPENDIX F—Quick Reference Information...........................43

APPENDIX G—Thermostat Staging Algorithm...................44-45

INSTRUCTIONS

This guide uses your expertise and observations to lead you to the

trouble spot as efficiently as possible. This is only intended as a

guide and should not be used blindly. Your experience and

expertise are of high value when troubleshooting this unit. Do not

disregard all of your instincts.

The microprocessor furnace control was designed with diagnostic

capabilities built in. LEDs are used to flash a fault code which will

lead 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 the

appropriate subsection where a minimal number of steps will be

used to correct the problem. If you are very experienced at how

this furnace operates and you suspect the problem is either the

blower motor, inducer motor, or furnace control board, you can use

the quick motor test procedure at the end of the troubleshooting

guide to isolate the problem or direct you to appropriate section in

main troubleshooting guide.

Once in a subsection, read the statement or question. A statement

will have a number in the "GO TO" column. Do whatever the

statement 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 answer

is "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, and

see how it works. Suppose that the problem is a defective

low-pressure switch (for example will not make). This is an

internal problem and cannot simply be seen. We go to the START

HERE section to Step 1.

EXAMPLE

Start Here Section

STEP YES NO GO TO

1. Step 1 tells us to record status of LEDs 1-4 and go to Step 2. — — 2

2.

Step 2 asks the question, "Are any LEDs flashing?". If low-pressure switch was

defective, a low-pressure switch fault code would be flashing, so the answer is

"YES." We go to Step 5.

53 —

5.

Step 5 asks the question, "Is RED LED2 flashing?". If low-pressure switch was

defective, a low-pressure switch fault code would be flashing, so the answer is

"NO". We go to Step 7.

67 —

7. Step 7 tells us to go to low-pressure switch fault subsection. — — INDEX

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Book 1 4

Tab 6a 8a

PC 101 Catalog No. 535-894 Printed in U.S.A. Form 58MVP-1SM Pg 1 4-95 Replaces: New