Goodman GMEC960803BNAC - User Manual

Service and Troubleshooting
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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

Product Identification

Nomenclature and Model Breakdown

Explains the breakdown of model number components for identification.

Model Specification Table

Lists specific model numbers, manufacturer numbers, and their descriptions.

System Operation

Safety and Product Application Overview

Covers general safety warnings, intended use, and limitations.

Combustion Air and Venting Requirements

Guidelines for ensuring adequate air for safe combustion and proper venting.

DIP Switch Settings for Operation

Configuration settings for furnace operation modes and speeds.

Scheduled Maintenance

Annual Inspection and Filter Service

Procedures for yearly inspection and air filter maintenance.

Performance Testing and Gas Metering

Methods for testing furnace performance and measuring gas input.

Servicing

Electrical System Checks

Procedures for checking voltage, phasing, and wiring integrity.

Blower Motor and Airflow Diagnostics

Procedures for checking blower motor operation and duct static pressure.

Gas Pressure and Safety Control Checks

Inspects gas pressure, valves, limits, and rollout controls for proper function.

Ignition System Diagnostics

Tests for hot surface ignitor, flame sensor, and pressure switches.

Troubleshooting

LED Diagnostic Code Interpretation

Explains LED flash codes for identifying operational faults.

Fault Code Retrieval and Lockout Reset

Methods for retrieving stored fault codes and resetting furnace lockouts.

Goodman GMEC960803BNAC Specifications

General

Model	GMEC960803BNAC
Type	Gas Furnace
Brand	Goodman
Efficiency Rating	96% AFUE
Heating Capacity (BTU Input)	80, 000 BTU
Heating Capacity (BTU Output)	76, 800 BTU
Fuel Type	Natural Gas
Warranty	10-Year Limited Parts Warranty
Blower Motor	Multi-Speed ECM
Stages	2-Stage