Variable Speed, Two-Stage
Electronic Condensing
Four-Way Multipoise Gas Furnace
Troubleshooting Guide
(This document is to be used for Series 170 58MVP furnaces. Use
58MVP-8SM for all previous Series.)
NOTE:
Read the entire instruction manual before starting the
installation.
TABLE OF CONTENTS
Safety Considerations.....................................................................1
Instructions .....................................................................................1
General............................................................................................3
Sequence of Operation...................................................................3
Single-Stage Thermostat and Two-Stage Heating
(Adaptive Mode).......................................................................3
Two-Stage Thermostat and Two-Stage Heating......................4
Cooling Mode ...........................................................................5
Thermidistat Mode....................................................................6
Super-Dehumidify Mode ..........................................................6
Continuous Blower Mode.........................................................6
Heat Pump Defrost ...................................................................7
Component Test ........................................................................7
Service/Status Code Instructions ...................................................8
Component Test .............................................................................9
Start Here......................................................................................10
Rapid Flashing Amber LED ........................................................11
Improper Cooling Airflow ...........................................................12
High-Heat Temperature Rise Too Low.......................................13
Status Code 11—No Previous Code ...........................................14
Status Code 12—Blower On After Power Up............................14
Status Code 13—Limit Circuit Lockout .....................................15
Status Code 14—Ignition Lockout ..............................................16
Status Code 15—Blower Motor Lockout....................................16
Status Code 21—Gas Heating Lockout ......................................16
Status Code 22—Abnormal Flame-Proving Signal ....................17
Status Code 23—Pressure Switch Did Not Open.......................17
Status Code 24—Secondary Voltage Fuse Is Open ...................18
Status Code 25—Model Selection or Setup Error......................20
Status Code 31—High-Heat Pressure Switch or Relay Did
Not Close or Reopened................................................................21
Status Code 32—Low-Heat Pressure Switch Did Not Close
or Reopened..................................................................................23
Status Code 33—Limit Circuit Fault ..........................................24
Status Code 34—Ignition Proving Fault .....................................27
Status Code 41—Blower Motor Fault.........................................29
Status Code 42—Inducer Motor Fault ........................................31
Status Code 43—Low-Heat Pressure Switch Open While
High-Heat Pressure Switch is Closed..........................................33
Status Code 45—Control Circuitry Lockout...............................34
Cleanup and Start-Up Instructions ..............................................34
Appendix A
Board Layout and Wiring Schematics ........................................35
Appendix B
ECM Blower Motor Description and Operation.........................37
Appendix C
Pressure Check Diagram..............................................................38
Appendix D
Static Pressure Reading Location Diagrams ...............................38
Appendix E
Quick Reference Information ......................................................40
Flame Sensor Microamperage...........................................40
Hot Surface Igniter Reading .............................................40
Gas Valve Ohm Readings.................................................40
Power choke (Inductor) .....................................................40
Appendix F
Furnace Staging Algorithm..........................................................40
SAFETY CONSIDERATIONS
Installing and servicing heating equipment can be hazardous due to
gas and electrical components. Only trained and qualified person-
nel should install, repair, or service heating equipment.
Untrained personnel can perform basic maintenance functions
such as cleaning and replacing air filters. All other operations must
be performed by trained service personnel. When working on
heating equipment, observe precautions in the literature, on tags,
and on labels attached to or shipped with the unit and other safety
precautions that may apply.
Follow all safety codes. In the United States, follow all safety
codes including the National Fuel Gas Code (NFGC) NFPA 54
2002/ANSI Z223.1-2002 and the Installation Standards, Warm Air
Heating and Air Conditioning Systems (NFPA 90B) ANSI/NFPA
90B. In Canada, refer to the CAN/CGA-B/49.1- and .2-M00
National Standard of Canada, Natural Gas and Propane Installation
Codes (NSCNGPIC). Wear safety glasses and work gloves. Have
a fire extinguisher available during start-up and adjustment proce-
dures and service calls.
Recognize safety information. This is the safety-alert symbol
.When you see this symbol on the unit and in instructions or
manuals, be alert to the potential for personal injury.
Understand the signal words DANGER, WARNING, CAUTION,
and NOTE. These words are used with the safety-alert symbol.
DANGER identifies the most serious hazards, which will result in
severe personal injury or death. WARNING signifies hazards
which could result in personal injury or death. CAUTION is used
to identify unsafe practices, which would result in minor personal
injury or product and property damage. NOTE is used to highlight
suggestions, which will result in enhanced installation, reliability,
or operation.
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.
Visit www.carrier.com
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. 535–80083
Printed in U.S.A.
Form 58MVP-10SM
Pg 1
6-03
Replaces: New
