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Goodman GMEC961004CNAB User Manual

Goodman GMEC961004CNAB
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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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
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



Cancer and Reproductive Harm -
www.P65Warnings.ca.gov
0140M00517-A

Table of Contents

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Goodman GMEC961004CNAB Specifications

General IconGeneral
ModelGMEC961004CNAB
TypeGas Furnace
BrandGoodman
Efficiency Rating96% AFUE
Blower MotorVariable Speed
Fuel TypeNatural Gas
ConfigurationUpflow/Horizontal
BTU Output96, 000 BTU/h
StagesTwo Stage
BTU Input100, 000 BTU/h
Warranty10-Year Limited Parts Warranty

Summary

IMPORTANT INFORMATION

IMPORTANT INFORMATION CONTINUED

CARBON MONOXIDE POISONING HAZARD

Risks associated with carbon monoxide and necessary precautions.

SYSTEM OPERATION

SYSTEM OPERATION CONTINUED

COMBUSTION AND VENTILATION AIR REQUIREMENTS

Critical information for ensuring proper air supply for combustion and ventilation.

Propane Gas and/or High Altitude Installations

Requirements for converting the furnace for propane or high altitudes.

GAS SUPPLY AND PIPING

Instructions for connecting the gas supply to the furnace.

PROPANE GAS CONVERSION

Steps for converting the furnace from natural gas to propane.

24 VOLT THERMOSTAT WIRING

Wiring instructions for connecting a 24-volt thermostat.

SINGLE-STAGE HEATING THERMOSTAT APPLICATION

How to use a single-stage thermostat to control the furnace.

DIP SWITCH SETTINGS

Overview of DIP switch settings for furnace control.

*MEC960303AN - COOLING

DIP switch settings for MEC960303AN model in cooling mode.

VENT/FLUE PIPE AND COMBUSTION AIR PIPE ONLY

Guidelines for the installation of vent and flue piping systems.

THERMOSTAT WIRING

Diagrams illustrating thermostat wiring configurations.

CIRCULATOR BLOWER SPEED ADJUSTMENT

Procedures for adjusting the blower motor speed settings.

*MEC960303AN - HEATING

DIP switch settings for MEC960303AN model in heating mode.

SCHEDULED MAINTENANCE

SCHEDULED MAINTENANCE CONTINUED

SERVICING

CHECKING FOR PHASING - PRIMARY TO SECONDARY OF UNMARKED TRANSFORMERS*

How to check transformer phasing for proper electrical operation.

SERVICING CONTINUED

CHECKING VOLTAGE

Steps to verify line voltage and blower motor voltage.

CHECKING AIR CIRCULATOR BLOWER MOTOR (MULTI-SPEED ECM MOTOR)

Procedure for checking the blower motor's wiring and operation.

CHECKING THERMOSTAT, WIRING

How to test thermostat wiring and the thermostat itself.

CHECKING TRANSFORMER AND CONTROL CIRCUIT

Testing the furnace's step-down transformer and control circuit.

TROUBLESHOOTING

TROUBLESHOOTING CONTINUED

DIAGNOSTIC CHART

Table correlating LED flash codes with fault conditions.

WIRING DIAGRAMS

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