Goodman GMEC960603BNAC - User Manual

Service and Troubleshooting
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®
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
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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Cancer and Reproductive Harm -
www.P65Warnings.ca.gov
0140M00517-A

Summary

IMPORTANT INFORMATION

RECOGNIZE SAFETY SYMBOLS, WORDS AND LABELS

Guidance on identifying and understanding safety symbols, words, and labels.

PRODUCT IDENTIFICATION

NOMENCLATURE

Identifies furnace components and their meaning in the model number.

SYSTEM OPERATION

Safety

Essential warnings and precautions for installation, adjustment, and servicing.

Location Requirements and Considerations

Guidelines for furnace placement, clearances, and environmental factors.

COMBUSTION AND VENTILATION AIR REQUIREMENTS

Details on providing adequate air for combustion and ventilation.

DIP SWITCH SETTINGS

Configuration options for blower speeds, staging, and fan delays.

SCHEDULED MAINTENANCE

ANNUAL INSPECTION

Recommended yearly checks for furnace components and operation.

CLOCKING A GAS METER

Procedure to measure furnace BTU input using a gas meter.

SERVICING

CHECKING VOLTAGE

Procedures for verifying incoming power and internal voltages.

CHECKING THERMOSTAT, WIRING

Steps to diagnose thermostat and wiring issues affecting operation.

CHECKING GAS PRESSURE

Procedures for measuring and adjusting gas supply and manifold pressures.

CHECKING PRESSURE SWITCH

Diagnosing pressure switches for venting and safety issues.

TROUBLESHOOTING

DIAGNOSTIC CHART

Interpreting LED flash codes for furnace fault diagnosis.

WIRING DIAGRAMS

Goodman GMEC960603BNAC Specifications