Carrier 58MVP 170 Series User Manual

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

Carrier 58MVP 170 Series Specifications

General

Stages	Two-stage
Blower Motor	Variable Speed
Fuel Type	Natural Gas
Heat Exchanger	Stainless steel
Ventilation	Direct Vent
Warranty	10-Year Parts Limited Warranty

Summary

Safety and General Information

Safety Considerations and Usage Guide

Covers safety precautions, code compliance, alert symbols, and guide usage.

Furnace Appendices Overview

Introduces appendices on board layout, schematics, and ECM blower motor.

Troubleshooting Process Initiation

Diagnostic Capabilities and AMBER LED

Explains the diagnostic features of the furnace control using an AMBER LED.

Using the 'START HERE' Section

Guidance on starting troubleshooting by following the 'START HERE' step-by-step process.

Sequence of Operation and General Details

Furnace Operation Sequence

Describes the sequence of operation through different furnace modes.

General Furnace Requirements and Safety Notes

Covers power, gas service, thermostat wiring, and limit switch precautions.

Sequence of Operation: Heating Stages

Single-Stage Adaptive Heating

Explains adaptive heating with single-stage thermostats and stage switching.

Two-Stage Heating Operation

Details furnace operation with two-stage thermostats and stage transitions.

Furnace Modes: Cooling and Thermidistat

Cooling Mode Operation

Describes furnace operation during single-stage and two-stage cooling.

Thermidistat and Dehumidify Functions

Explains Thermidistat operation, including Super-Dehumidify mode.

Special Furnace Functions

Continuous Blower and Heat Pump Defrost

Details continuous blower operation and heat pump defrost cycles.

Component Test Procedure

Instructions for initiating and performing the furnace component test.

Service and Status Code Instructions

Understanding Status Code Indications

Explains how status codes are indicated by the AMBER LED and their meaning.

Service/Status Code Troubleshooting Steps

Details specific status codes and their associated troubleshooting steps.

Troubleshooting Specific Status Codes (11-21)

Status Codes 11, 12, 13, 14, 15, 21

Troubleshooting steps for codes 11 (No Previous), 12 (Blower On), 13 (Limit Lockout), 14 (Ignition Lockout), 15 (Blower Lockout), 21 (Gas Heating Lockout).

Advanced Status Codes and Faults

Status Codes 22 through 45

Troubleshooting steps for status codes 22 (Flame Signal), 23 (Pressure Switch), 24 (Fuse), 25 (Setup Error), 31 (High-Heat Switch), 33 (Limit Fault), 34 (Ignition Fault), 41 (Blower Fault), 42 (Inducer Fault), 43 (Pressure Mismatch), 45 (Control Lockout).

Specific LED Indicators and Temperature Issues

Diagnosing rapid flashing amber LED and low high-heat temperature rise.

Troubleshooting Flowcharts

Start Here Troubleshooting Guide

Step-by-step process for diagnosing furnace issues using the 'START HERE' chart.

Rapid Flashing Amber LED Diagnosis

Flowchart for troubleshooting issues indicated by a rapid flashing amber LED.

Cooling Airflow Diagnostics

Identifying Improper Cooling Airflow

Steps to diagnose improper cooling airflow, often related to thermostat wiring.

Checking Cooling System Parameters

Includes checking voltage, thermostat connections, and cooling unit parameters.

High Heat Temperature Rise Troubleshooting

Diagnosing Low High-Heat Temperature Rise

Troubleshooting steps for a low high-heat temperature rise, often due to underfiring.

Gas Valve and Manifold Pressure Checks

Focuses on gas valve operation and manifold pressure for temperature rise issues.

Specific Status Code Troubleshooting (Codes 11 & 12)

Status Code 11: No Previous Code

Troubleshooting for status code 11, indicating no prior stored codes were found.

Status Code 12: Blower Operation After Power Up

Troubleshooting for status code 12, related to blower operation after power restoration.

Status Codes 13, 14, 15, and 21

Status Code 13: Limit Circuit Lockout

Troubleshooting steps for status code 13, indicating a limit circuit lockout.

Status Code 14: Ignition Lockout

Troubleshooting steps for status code 14, related to ignition failure lockout.

Status Code 15: Blower Motor Lockout

Troubleshooting steps for status code 15, indicating a blower motor lockout.

Status Code 21: Gas Heating Lockout

Troubleshooting steps for status code 21, related to gas heating lockout.

Status Codes 22 and 23

Status Code 22: Abnormal Flame-Proving Signal

Troubleshooting steps for status code 22, indicating an abnormal flame-proving signal.

Status Code 23: Pressure Switch Did Not Open

Troubleshooting steps for status code 23, pressure switch did not open.

Status Code 24: Secondary Voltage Fuse

Troubleshooting Status Code 24

Steps to diagnose issues related to a secondary voltage fuse being open.

Status Code 24 Continued

Diagnosing Wiring Shorts for Status Code 24

Steps to diagnose wiring shorts associated with status code 24.

Status Code 24 Further Diagnosis

Status Code 24: Thermostat and Wiring Issues

Troubleshooting status code 24 related to thermostat compatibility or wiring faults.

Status Code 24: Outdoor Unit and Cooling Cycle Checks

Diagnosing status code 24 issues related to outdoor unit or cooling cycle.

Status Codes 25 and 31

Status Code 25: Model Selection or Setup Error

Troubleshooting steps for status code 25, indicating a model selection or setup error.

Status Code 31: High-Heat Pressure Switch Operation

Troubleshooting steps for status code 31, related to high-heat pressure switch.

Status Code 31 Continued

Status Code 31: Pressure Switch Wiring and Manifold Pressure

Checking wiring and manifold pressure for status code 31 issues.

Status Code 31: Venting and Inducer Motor Checks

Diagnosing status code 31 issues related to venting or inducer motor.

Status Code 31 Further Checks

Status Code 31: Inducer Motor PWM and Pressure Drop

Checking inducer motor PWM signals and pressure drop for status code 31.

Status Code 31: Venting Pipe and Drain Trap Issues

Diagnosing status code 31 issues related to venting pipes or drain traps.

Status Code 32: Low-Heat Pressure Switch

Troubleshooting Status Code 32

Steps to diagnose issues with the low-heat pressure switch for status code 32.

Checking Low-Heat Switch Wiring and Continuity

Steps to check wiring and continuity for the low-heat pressure switch.

Status Codes 32 Continued and 33

Status Code 32: Inducer Motor and Pressure Checks

Diagnosing status code 32 issues with inducer motor and pressure.

Status Code 33: Limit Circuit Fault

Troubleshooting steps for status code 33, indicating a limit circuit fault.

Status Code 33 Continued

Status Code 33: Switch Continuity and Alignment

Checking switch continuity, alignment, and model plug for status code 33.

Status Code 33: Combustion Air and Blower Operation

Diagnosing status code 33 issues related to combustion air or blower operation.

Status Code 33 Advanced Checks

Status Code 33: Overheating and Bypass Issues

Checking overheating, bypass humidifiers, and zone damper issues for status code 33.

Status Code 33: Blower Airflow Adjustment

Adjusting blower airflow settings to resolve status code 33.

Status Code 34: Ignition Proving Fault

Troubleshooting Ignition Proving Faults

Steps to diagnose ignition proving faults indicated by status code 34.

Status Code 34 Continued

Status Code 34: Gas Valve and Flame Sensor Checks

Checking gas valve and flame sensor for status code 34 issues.

Status Code 34: Burner Ignition and Carryover

Diagnosing status code 34 related to burner ignition or flame carryover.

Status Code 41: Blower Motor Fault

Troubleshooting Blower Motor Faults

Steps to diagnose blower motor faults indicated by status code 41.

Checking Blower Motor Connections and Power

Checking blower motor wiring, connections, and 115-vac power supply.

Status Code 41 Continued

Status Code 41: Blower Motor Signal Checks

Checking blower motor serial output and voltage signals for status code 41.

Status Codes 41 and 42

Status Code 41: Blower Motor Module and Wiring

Troubleshooting blower motor module and wiring for status code 41.

Status Code 42: Inducer Motor Fault

Troubleshooting steps for status code 42, indicating an inducer motor fault.

Status Code 42 Continued

Status Code 42: Inducer Motor PWM and Pressure Checks

Checking inducer motor PWM signals and pressure readings for status code 42.

Status Code 42: Venting Pipe and Pressure Switch Checks

Diagnosing status code 42 issues related to venting pipes or pressure switches.

Status Code 43: Pressure Switch Mismatch

Troubleshooting Status Code 43

Steps to diagnose status code 43, a mismatch in pressure switch states.

Checking Pressure Switch Wiring and Continuity

Steps to check wiring and continuity for pressure switches related to status code 43.

Status Code 45 and Startup Procedures

Status Code 45: Control Circuitry Lockout

Troubleshooting steps for status code 45, indicating a control circuitry lockout.

Cleanup and Start-Up Instructions

Procedure for cleaning the furnace and performing initial startup.

Furnace Control Board and Schematics

Variable Speed Furnace Control Layout

Diagram showing the layout of the variable speed furnace control board.

Wiring Schematics

Detailed wiring diagrams for the furnace control system.

Detailed Wiring Diagrams

Furnace Wiring Schematic Details

Comprehensive wiring schematic for the furnace system, including component connections.

ECM Blower Motor Information

ECM Blower Motor Description

Description of the Electronically Commutated Motor (ECM) and its features.

ECM Blower Motor Operation and Configuration

Explanation of ECM blower motor operation and configuration by the furnace control.

Pressure Switch and Static Pressure Diagrams

Pressure Switch Make/Break Points

Table detailing make/break points for high-heat and low-heat pressure switches.

Upflow Static Pressure Reading Locations

Diagrams showing locations for reading static pressure in upflow configurations.

Static Pressure and Quick Reference

Downflow and Horizontal Static Pressure Readings

Diagrams illustrating static pressure reading locations for downflow and horizontal furnaces.

Quick Reference: Pressure Switches and Sensors

Summary of pressure switch points and readings for flame sensor and ignitor.

Furnace Performance Reference

Gas Valve and Inductor Specifications

Details ohm readings for gas valves and power choke (inductor).

Furnace Staging Algorithm Overview

Introduction to the furnace staging algorithm for adjusting heat output.

Furnace Staging Algorithm Examples

Staging Calculations: Examples 1 & 2

Calculations for furnace staging based on previous heat run times.

Staging Scenarios: Examples 3 & 4

Scenarios demonstrating how the staging algorithm adjusts heat cycles.

Furnace Staging Algorithm Flowchart

Calculating Heat Load and Run Times

Flowchart for calculating heat load and determining staged run times.

Service Training Information

Packaged Service Training Programs

Information on available packaged service training programs for equipment.

Classroom Service Training

Details on classroom service training for hands-on learning.