Goodman GMEC961205DNAC - User Manual

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. 





















Cancer and Reproductive Harm -
www.P65Warnings.ca.gov
0140M00517-A

Goodman GMEC961205DNAC Specifications

General

Brand	Goodman
Model	GMEC961205DNAC
Category	Furnace
Language	English

Summary

System Operation

Combustion and Ventilation Air Requirements

Propane Gas and High Altitude Installations

Requirements for converting furnaces for propane and high altitude operation.

Vent;Flue Pipe and Combustion Air Pipe Terminations

Propane Gas Conversion

Procedures and kits required for converting the furnace to propane gas.

DIP Switch Settings PCBBF137 Control Board

Sequence of Operation: Power Up

Sequence of Operation: Heat Mode

Step-by-step operation during a heating call, including safety checks and flame proving.

Simultaneous Call for Low and High Heat

Cooling Mode Sequence

Combustion Quality Factors

Scheduled Maintenance

Annual Inspection Checklist

Essential items to check annually for proper furnace operation and safety.

Filter Maintenance and Removal

Importance of filter maintenance and procedures for removal and replacement.

Burner Inspection

Visual checks for burner flame appearance, stability, and color.

Heating Performance Test

Procedures for testing furnace performance, including BTU input, airflow, and temperature rise.

Clocking a Gas Meter

Method for measuring gas input by timing the gas meter's dial revolution.

BTU;HR Calculation Example

Servicing

Checking Transformer Phasing

Checking Voltage

Checking Thermostat and Wiring

Checking Transformer and Control Circuit

Checking Air Circulator Blower Motor

Procedures for checking the multi-speed ECM blower motor, including wiring and speed taps.

Checking Duct Static Pressure

Checking Temperature Rise

Steps to measure temperature rise and adjust blower speed for optimal performance.

Checking Primary Limit Control

Checking Auxiliary Limit Control

Checking Flame Rollout Control

Induced Draft Blower Motor

Testing the induced draft blower motor for continuity, voltage, and operation.

Checking Gas Valve

Checking Main Burners

Checking Orifices

Checking Gas Pressure - Supply Pressure Measurement

Procedures for measuring inlet gas supply pressure using a manometer.

Measuring Gas Pressure: Two-Stage Valves Contd

Continuing the procedure for measuring gas manifold pressure on two-stage valves.

Checking Hot Surface Ignitor

Testing the hot surface ignitor for resistance, temperature, and current draw.

Checking for Flashback

Checking Pressure Switch

Testing pressure switches to ensure proper venting and safety interlock function.

High Altitude Application (USA)

Checking for Delayed Ignition

Checking Flame Sensor

Procedures for checking the flame sensor's continuity and micro-amp reading for flame detection.

Troubleshooting

Troubleshooting Chart - LED Codes

A comprehensive chart correlating LED flash codes with fault descriptions and checks.

Troubleshooting Chart - Continued

Further troubleshooting information based on LED flash codes and fault conditions.

Diagnostic Chart and Lockout Procedures

Detailed diagnostic info for fault codes, lockouts, and retrieval methods.

Wiring Diagrams

Wiring Diagram - MEC96 REV AA

Detailed schematic showing all electrical connections and component layout.

Wiring Diagram - MEC96 REV AB

Alternative wiring diagram for specific model revisions, detailing electrical pathways.

Wiring Diagram - MEC96 REV AC; CEC96 REV AA

Wiring schematic for different model revisions, illustrating component connections.