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Goodman GMEC960402BNAC User Manual

Goodman GMEC960402BNAC
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Service and Troubleshooting

®

®


Copyright © 2014-2020 Goodman Manufacturing Company, L.P.
RS6612013r10
June 2020
®
is a registered trademark of Maytag Corporation or its related companies and is used under license.
All rights reserved.
TABLE OF CONTENTS
IMPORTANT INFORMATION ............................................ 2
PRODUCT IDENTIFICATION ........................................... 4
SYSTEM OPERATION ...................................................... 7
SCHEDULED MAINTENANCE ....................................... 42
SERVICING ..................................................................... 46
CHECKING VOLTAGE .............................................. 47
CHECKING WIRING .................................................. 47
CHECKNG THERMOSTAT, WIRING ........................ 47
HEATING ANTICIPATOR ........................................... 47
CHECKING TRANSFORMER AND CONTROL
CIRCUIT ...................................................................... 47
CHECKING AIR CIRCULATOR BLOWER MOTOR 48
CHECKING DUCT STATIC ........................................ 48
CHECKING TEMPERATURE RISE .......................... 49
CHECKING PRIMARY LIMIT CONTROL ................. 49
CHECKING AUXILIARY LIMIT CONTROL ............... 50
CHECKING FLAME ROLLOUT CONTROL ............. 51
INDUCED DRAFT BLOWER MOTOR ...................... 52
CECKING GAS VALVE (REDUNDANT) ................... 52
CHECKING MAIN BURNERS ................................... 52
CHECKING ORIFICES .............................................. 52
CHECKING GAS PRESSURE .................................. 53
CHECKING HOT SURFACE IGNITOR ..................... 55
CHECKING FOR FLASHBACK ................................. 55
CHECKING PRESSURE SWITCH............................ 55
HIGH ALTITUDE APPLICATION ............................... 56
CHECKING FOR DELAYED IGNITION .................... 56
CHECKING INTERGRATED IGNITION CONTROL
BOARDS ..................................................................... 56
CHECKING FLAME SENSOR ................................... 57
TROUBLESHOOTING CHART ....................................... 58
WIRING DIAGRAMS ....................................................... 61
Pride and workmanship go into every product to provide
our customers with quality products. It is possible, however,
that during its lifetime a product may require service.

technician who is familiar with the safety procedures
required in the repair and who is equipped with the proper
tools, parts, testing instruments and the appropriate service
manual. 


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

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












Cancer and Reproductive Harm -
www.P65Warnings.ca.gov
0140M00517-A

Table of Contents

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Goodman GMEC960402BNAC Specifications

General IconGeneral
BrandGoodman
ModelGMEC960402BNAC
CategoryFurnace
LanguageEnglish

Summary

Important Information

Safety Warnings and Notices

Essential notices for consumers and service personnel, including safety warnings.

Product Identification

Nomenclature and Model Details

Explains model numbering and lists product specifications for identification.

Model to Description Mapping

Lists specific model numbers and their corresponding manufacturing numbers and descriptions.

System Operation

Introduction, Safety, and Application

Covers furnace introduction, safety warnings, ESD precautions, and product application.

Installation Considerations

Details location requirements, clearances, and venting/combustion air needs.

Electrical and Thermostat Wiring

Guides for electrical connections, thermostat wiring, and DIP switch configurations.

Sequence of Operation

Explains the furnace's operational steps for heating, cooling, and fan modes.

Scheduled Maintenance

Annual Inspection and Filter Care

Procedures for annual furnace inspection, filter replacement, and blower motor service.

Gas Meter and Pressure Testing

Steps for clocking the gas meter and measuring gas supply and manifold pressures.

Servicing

Electrical Checks and Phasing

Procedures for checking voltage, transformers, and electrical connections.

Blower Motor and Duct Static Checks

Guides for checking the air circulator blower motor and measuring duct static pressure.

Limit Controls and Flame Sensors

Instructions for checking primary limit, auxiliary limit, rollout controls, and flame sensors.

Gas Pressure and Component Testing

Procedures for checking gas valve, burners, orifices, and gas pressure.

Ignitor and Pressure Switch Tests

Steps for checking the hot surface ignitor, flashback, and pressure switches.

Troubleshooting

Diagnostic Codes and Fault Resolution

Tables for LED flash codes and troubleshooting steps for furnace faults.

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