Diagnostic Chart; Fault Recall; Resetting From Lockout; Maintenance - Goodman GMH95 Installation Instructions Manual

D C
IAGNOSTIC HART
HIGH VOLTAGE!
T
O AVOID PERSONAL INJURY OR DEATH DUE TO
,
ELECTRICAL SHOCK DISCONNECT ELECTRICAL POWER
P
BEFORE ERFORMAING ANY SERVICE OR MAINTENANCE
Refer to the Troubleshooting Chart at the end of this manual for
assistance in determining the source of unit operational problems.
The red diagnostic LED blinks to assist in troubleshooting the unit.
The number of blinks refers to a specific fault code.
F R
AULT ECALL
The ignition control is equipped with a momentary pushbutton
switch that can be used to display on the diagnostic LED the last
five faults detected by the control. The control must be in Standby
Mode (no thermostat inputs) to use the feature. Depress the
pushbutton switch for approximately 2 seconds. Release the switch
when the LED is turned off. The diagnostic LED will then display
the flash codes associated with the last five detected faults. The
order of display is the most recent fault to the least recent fault.
R F L
ESETTING ROM OCKOUT
Furnace lockout results when a furnace is unable to achieve igni-
tion after three attempts during a single call for heat. It is character-
ized by a non-functioning furnace and a one flash diagnostic LED
code. If the furnace is in "lockout", it will (or can be) reset in any of
the following ways.
1. Automatic reset. The integrated control module will
automatically reset itself and attempt to resume normal
operations following a one hour lockout period.
2. Manual power interruption. Interrupt 115 volt power to the
furnace for 1 - 20 seconds.
3. Manual thermostat cycle. Lower the thermostat so that
there is no longer a call for heat then reset to previous setting.
Interrupt thermostat signal to the furnace for 1 - 20 seconds.
NOTE: If the condition which originally caused the lockout still
exists, the control will return to lockout. Refer to Section XVIII,
Troubleshooting - Diagnostic Chart for aid in determining the cause.
XIX. MAINTENANCE
HIGH VOLTAGE!
T
O AVOID PERSONAL INJURY OR DEATH DUE TO
,
ELECTRICAL SHOCK DISCONNECT ELECTRICAL POWER
BEFORE PERFORMING ANY MAINTENANCE
,
HANDLE THE IGNITER HANDLE WITH CARE
THE IGNITER ELEMENT WITH BARE FINGERS
HANDLING OR VIBRATION COULD DAMAGE THE IGNITER
RESULTING IN PREMATURE FAILURE
SERVICER SHOULD EVER HANDLE THE IGNITER
A
NNUAL INSPECTION
The furnace should be inspected by a qualified installer, or service
agency at least once per year. This check should be performed at
the beginning of the heating season. This will ensure that all fur-
nace components are in proper working order and that the heating
*NOTE: Please contact your distributor or our website for the applicable Specification Sheet referred to in this manual.
WARNING
.
WARNING
. I
F YOU MUST
. T
OUCHING
,
ROUGH
. O
NLY A QUALIFIED
.
system functions appropriately. Pay particular attention to the fol-
lowing items. Repair or service as necessary.
•
Flue pipe system. Check for blockage and/or leakage. Check
the outside termination and the connections at and internal
to the furnace.
•
Heat exchanger. Check for corrosion and/or buildup within
the heat exchanger passageways.
•
Burners. Check for proper ignition, burner flame, and flame
sense.
•
Drainage system. Check for blockage and/or leakage.
Check hose connections at and internal to furnace.
•
Wiring. Check electrical connections for tightness and/or
corrosion. Check wires for damage.
•

Filters.

F
ILTERS
T
O ENSURE PROPER UNIT PERFORMANCE
SIZES GIVEN IN THE RECOMMENDED
S S
PECIFICATION HEET APPLICABLE TO YOUR MODEL
M
AINTENANCE
Improper filter maintenance is the most common cause of inad-
equate heating or cooling performance. Filters should be cleaned
(permanent) or replaced (disposable) every two months or as re-
quired. When replacing a filter, it must be replaced with a filter of
the same type and size.
F R
ILTER EMOVAL
Depending on the installation, differing filter arrangements can be
applied. Filters can be installed in either the central return register
or a side panel external filter rack (upflow only). A media air filter or
electronic air cleaner can be used as an alternate filter. Follow the
filter sizes given in the Recommended Minimum Filter size table to
ensure proper unit performance.
To remove filters from an external filter rack in an upright upflow
installation, follow the directions provided with external filter rack
kit. To remove internal filters see Internal Filter Removal section.
Internal filters are an accessory item and are not included with
your furnace. For further details, see your distributor.
H U F R
ORIZONTAL NIT ILTER EMOVAL
Filters in horizontal installations are located in the central return
register or the ductwork near the furnace.
To remove:
1. Turn OFF electrical power to furnace.
2. Remove filter(s) from the central return register or ductwork.
3. Replace filter(s) by reversing the procedure for removal.
4. Turn ON electrical power to furnace.
M A F E
EDIA IR ILTER OR LECTRONIC
Follow the manufacturer's directions for service.
B
URNERS
Visually inspect the burner flames periodically during the heating
season. Turn on the furnace at the thermostat and allow several
minutes for flames to stabilize, since any dislodged dust will alter
the flames normal appearance. Flames should be stable, quiet,
soft, and blue (dust may cause orange tips but they must not be
yellow). They should extend directly outward from the burners with-
32
CAUTION
,
ADHERE TO THE FILTER
M F S T
INIMUM ILTER IZE ABLE OR
*
A C R
IR LEANER EMOVAL