Service and Troubleshooting
*MVS96*U
Single Stage Variable Speed Ultra-Low NOx Gas Furnaces and Accessories
Copyright © 2020 Goodman Manufacturing Company, L.P.
RS6612018r1
June 2020
TABLE OF CONTENTS
IMPORTANT INFORMATION ............................................ 2
PRODUCT IDENTIFICATION ........................................... 4
SYSTEM OPERATION ...................................................... 6
SCHEDULED MAINTENANCE ....................................... 21
SERVICING ..................................................................... 24
CHECKING VOLTAGE .............................................. 25
CHECKING WIRING .................................................. 25
CHECKNG THERMOSTAT, WIRING ........................ 25
CHECKING TRANSFORMER AND CONTROL
CIRCUIT ...................................................................... 25
CHECKING AIR CIRCULATOR BLOWER MOTOR 26
CHECKING DUCT STATIC ........................................ 26
CHECKING TEMPERATURE RISE .......................... 26
CHECKING PRIMARY LIMIT CONTROL ................. 27
CHECKING AUXILIARY LIMIT CONTROL ............... 27
INDUCED DRAFT BLOWER MOTOR ...................... 28
CECKING GAS VALVE (REDUNDANT) ................... 28
CHECKING GAS PRESSURE .................................. 28
CHECKING HOT SURFACE IGNITER ..................... 30
CHECKING PRESSURE TRANSDUCER ................ 30
CHECKING FOR DELAYED IGNITION .................... 31
CHECKING INTERGRATED IGNITION CONTROL
BOARDS ..................................................................... 31
CHECKING FLAME SENSOR ................................... 31
TROUBLESHOOTING CHART ....................................... 32
WIRING DIAGRAMS ....................................................... 39
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 qualified 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.
REVIEW ALL SERVICE INFORMATION IN THE
APPROPRIATE SERVICE MANUAL BEFORE
BEGINNING REPAIRS.
Only personnel that have been trained to install, adjust,
service or repair(hereinafter, “service”) the equipment
specified in this manual should service the equipment. The
manufacturer will not be responsible for any injury or
property damage arising from improper service or service
procedures. If you service this unit, you assume responsi-
bility for any injury or property damage which may re-
sult. In addition, in jurisdictions that require one or more
licenses to service the equipment specified in this manual,
only licensed personnel should servise the equipment.
Improper installation, adjustment, servicing or repair of
the equipment specified in this manual, or attempting to
install, adjust, service or repair the equipment specified in
this manual without proper training may result in product
damage, property damage, personal injury or death.
WARNING
WARNING
PROP 65 WARNING
FOR CALIFORNIA CONSUMERS
Cancer and Reproductive Harm -
www.P65Warnings.ca.gov
0140M00517-A
