Goodman GMES800805CUAA

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Service and Troubleshooting

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RS6621006r2

June 2020

TABLE OF CONTENTS

IMPORTANT INFORMATION ............................................. 2

PRODUCT IDENTIFICATION ............................................ 4

SYSTEM OPERATION ....................................................... 6

SCHEDULED MAINTENANCE ........................................ 12

SERVICING ...................................................................... 15

CHECKING VOLTAGE ...............................................16

CHECKING WIRING ...................................................16

CHECKNG THERMOSTAT, WIRING .........................16

CHECKING TRANSFORMER AND CONTROL

CIRCUIT ....................................................................... 16

CHECKING AIR CIRCULATOR BLOWER MOTOR .17

CHECKING DUCT STATIC ......................................... 17

CHECKING TEMPERATURE RISE ...........................18

CHECKING PRIMARY LIMIT CONTROL ..................18

CHECKING AUXILIARY LIMIT CONTROL ................19

INDUCED DRAFT BLOWER MOTOR .......................19

CECKING GAS VALVE (REDUNDANT) ....................19

CHECKING GAS PRESSURE ...................................20

CHECKING HOT SURFACE IGNITER ......................22

CHECKING PRESSURE TRANSDUCER .................22

CHECKING FOR DELAYED IGNITION ..................... 22

CHECKING INTERGRATED IGNITION CONTROL

BOARDS ......................................................................22

CHECKING FLAME SENSOR ....................................23

TROUBLESHOOTING CHART ........................................ 24

WIRING DIAGRAMS ........................................................ 27

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.

Products should be serviced only by a qualied 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

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Summary

System Operation

Safety

Crucial warnings and cautions for installation, adjustment, servicing, and operation.

Electrical Connections

24 Volt Thermostat Wiring

Thermostat Wiring Single-Stage

Normal Sequence of Operation

Heating Mode

Describes the sequence of events when the furnace calls for heating.

Cooling Mode

Details the operational sequence when the furnace calls for cooling.

Fan Only Mode

Scheduled Maintenance

Annual Inspection

Outlines annual checks for furnace components to ensure proper working order.

Heating Performance Test

Clocking a Gas Meter

BTU;HR Calculation Example

Servicing

Checking Voltage

Procedure for measuring electrical voltage to diagnose component operation.

Checking Wiring

Thermostat and Wiring

Troubleshooting steps for the thermostat and its wiring connections.

Checking Transformer and Control Circuit

How to test the furnace's transformer and control circuit for proper voltage.

Checking Air Circulator Blower Motor

Steps for diagnosing and checking the air circulator blower motor's operation.

Checking Duct Static

Checking Temperature Rise

Method for measuring and adjusting the temperature rise across the heat exchanger.

Checking Primary Limit Control

How to test the primary limit control for proper operation.

Checking Auxiliary Limit Control

Procedure for testing the auxiliary limit control switch.

Induced Draft Blower Motor

Steps for checking the induced draft blower motor and its electrical connections.

Checking Gas Valve (Redundant)

Instructions for testing the redundant gas valve for proper function.

Checking Gas Pressure

Procedures for measuring and adjusting gas supply pressure.

Gas Supply Pressure Measurement

Detailed steps for measuring the inlet gas supply pressure.

Gas Manifold Pressure Measurement and Adjustment

Method for measuring and adjusting the gas manifold pressure.

Checking Hot Surface Igniter

Steps for testing the hot surface igniter's resistance and operation.

Checking Pressure Transducer (80% ULN)

Procedure for testing the pressure transducer for proper signals.

Field Test Mode

Checking Integrated Ignition Control Boards

Safety precautions and checks for the integrated ignition control board.

Checking Flame Sensor

Procedure for testing the flame sensor's micro-amp reading.

Troubleshooting

Furnace Fails to Operate (Control LED Off)

Diagnoses and actions for when the furnace fails to operate and the control LED is off.

Furnace Fails to Operate (1 Red Flash)

Troubleshooting steps for furnace failure with one red flash on the control LED.

Furnace Fails to Operate (2 Red Flashes)

Induced Draft Blower Runs Continuously

Furnace Fails to Operate (3 Red Flashes)

Circulator Blower Runs Continuously

Furnace Fails to Operate (4 Red Flashes)

Furnace Fails to Operate (5 Red Flashes)

Furnace Fails to Operate (6 Red Flashes)

No Furnace Operation (7 Red Flashes)

No Furnace Operation (8 Red Flashes)

Control LED 1 Amber Flash

Control LED 2 Amber Flashes

Control LED 3 Amber Flashes

Control LED 1 Green Flash (Heating Call)

Control LED 2 Green Flashes (Cooling Call)

Abnormal Noise During Burner Operation

Wiring Diagrams