Goodman GMEC96 Series Service And Troubleshooting page 59

TROUBLESHOOTING
Green
Symptoms
LED Code
•Furnace does not
operate, four Red •None
flashes on control board
•Furnace does not
operate, five Red •None
flashes on control board
•Furnace does not
operate, six Red flashes •None
on control board
•Furnace does not
operate, seven Red •None
flashes on control board
•Furnace does not
operate, eight Red •None
flashes on control board
•Furnace does not
operate, nine Red •None
flashes on control board
•Furnace does not
operate, ten Red flashes •None
on control board
•Furnace does not
operate, eleven Red
•None
flashes on control board,
inducer running
•Furnace does not
operate, twelve Red •None
flashes on control board
•Furnace does not
operate, control board •None
Red LED on solid
•Furnace does not
operate, control board •None
Red LED rapid flash
•Furnace does not
operate, control board
•None
Red LED with three
double flashes
Amber Red
LED Code LED Code
•Four •Open limit circuit, main
•None repeating limit, aux limit, or roll out
flashes switch
•Five •Limit & rollout circuit open
•None repeating for 15 minutes. Open control
flashes board fuse or rollout switch
•Pressure switch cycling
•Six
lockout, pressure switch has
•None repeating
opened 5 times in the same
flashes
heating cycle
•Seven •Lockout - excessive retries
•None repeating from flame not being proven
flashes during trial for ignition
•Eight • Lockout - excessive recycles
•None repeating from flame proving being lost
flashes after being proven
•Nine
•Improper grounding or
•None repeating
reverse polarity
flashes
•Ten
•Gas valve current detected
•None repeating
with no call for heat
flashes
•Eleven
•Open limit switch circuit for
•None repeating
more than 5 minutes
flashes
•Twelve
•Control board igniter relay
•None repeating
not energizing igniter
flashes
•None •Solid ON •Control board internal fault •Replace control board
•None •Rapid Flash •Twinning error
•Three
•Second stage pressure
•None double
switch stuck open
flashes
Fault Description
•Temperature rise, duct static,
gas pressure, burner alignment,
orifice plate position, wiring to
all limits
•Control board fuse,
Temperature rise, duct static,
gas pressure, burner alignment,
orifice plate position, wiring to
all limits
•Excessive venting restriction,
leaking pressure switch tubing
•Gas pressure, gas valve, front
cover pressure switch, flame
rod
•Gas pressure, gas valve, front
cover pressure switch, flame
rod
•115 volt hot & neutral supply
to furnace reversed, hot wire
(door switch & L1 on control
board) must read 115 volts to
ground & neutral. Neutral wire
should measure 0 volts to
ground
•Verify gas valve is not
receiving voltage from an
electrical short. If valve wiring
is correct replace control board
•Re-set main power and check
indoor blower operation
•Replace control board
•Correct twinning wiring
•Verify pressure switch
function & tubing, verify
inducer operating and pulling
enough vacuum to engage
switch
Check Cautions
•Confirm electrically safe
condition before
proceeding with repairs
•Confirm electrically safe
condition before
proceeding with repairs
•Confirm electrically safe
condition before
proceeding with repairs
•Confirm electrical and
gas safe conditions
before proceeding with
repairs
•Confirm electrical and
gas safe conditions
before proceeding with
repairs
•Confirm electrically safe
condition before
proceeding with repairs
•Confirm electrical and
gas safe conditions
before proceeding with
repairs
•Confirm electrically safe
condition before
proceeding with repairs
•Confirm electrically safe
condition before
proceeding with repairs
•Confirm electrically safe
condition before
proceeding with repairs
•Confirm electrically safe
condition before
proceeding with repairs
•Confirm electrically safe
condition before
proceeding with repairs
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