GMES96-U Installation Manual

36
T ROUBLESHOOTING C HART
Symptoms of Abnormal
Operation
Ass ocia ted
LED Code² &
Color
Fault Description(s) Possible
Causes
Corrective
Acti on
Cautions
& Notes
· LED is steady on Steady
LED color
AMBER.
· OEM test mode · N/A
· Integra ted control modul e
diagnostic LED is fl ashing
ONE (1) flash.
· Low fl a me sens e · Fl a me s ensor i ncorr ectl y
positioned in burner flame.
· I ns pec t for proper s ens or
alignment.
· Turn power OFF pri or
to repai r.
· Flame sensor is coated/oxidized. · Clean flame rod. · Clean flame s ensor
wi th s teel wool.
· Lazy burner flame due to improper
gas pressure or combustion air.
· Compa re current ga s
pressure to rating plate info.
Adjust as needed.
· See ra ti ng pl a te for
proper gas pressure.
· Integra ted control modul e
diagnostic LED is fl ashing
TWO (2) flash.
☼
2 Flash
LED color is
AMBER.
· ID plug failure (Applies only
to certa i n model s wi th ID
plug).
· Improper ID plug. · Replace ID plug. · Turn power OFF prior
to repai r.
· Integra ted control modul e
diagnostic LED is fl ashing
THREE (3) flash.
☼
3 Flash
LED color is
AMBER.
· Integrated control module
fuse is blown.
· Blown fuse. · Replace integrated control
module fuse (3A).
· Turn power OFF pri or
to repai r.
· LED is steady on Steady
LED color
GREEN.
· Normal operati on. · N/A
· Integra ted control modul e
diagnostic LED is fl ashing
rapidly.
Rapid flash
LED color is
GREEN.
· Clear error history. · N/A · Press and hold the SW1
button for more than 5 secs
results in the display of this
mode. Releasing the Button
during this indication will
cause the Error Hi s tory to be
cleared.
· The button must be
released within 5
seconds after
the LED begins this
flash sequence.
· Integra ted control modul e
diagnostic LED is fl ashing
ONE (1) flash.
☼
1 Flash
LED color is
GREEN.
· Call for heating. · N/A
· Integra ted control modul e
diagnostic LED is fl ashing
TWO (2) flash.
☼
2 Flash
LED color is
GREEN.
· Call for cooling. · N/A
· Integra ted control modul e
diagnostic LED is fl ashing
THREE (3) flash.
☼
3 Flash
LED color is
GREEN.
· Continuous fan operation. · N/A
· Integra ted control modul e
diagnostic LED has THREE (3)
rapid flash's.
☼
3 Rapid
Flash's
LED color is
GREEN.
· ID plug installed (Applies
only to certain models with
ID plug).
· N/A · For control with unit-
specific programmi ng
imbedded in the CPU, this
indicates at power-up that an
valid ID plug is installed.
· The control will use
the alternate
parameters.
· Abnormal high pitch noise
during burner operation.
· None · Abnormal combustion
noise.
· Insufficient combustion air or
high input.
· Check a nd correct ga s
supply and manifold
pressures. See Table 5 and
Table 9 for additional
information.
· Replace bad gas valve or gas
orifice size.
· Turn power and gas
OFF prior to repair.
· Blocked flue and/or air inlet pipe,
or faulty induced draft blower or
pres s ure s ens or.
· Check flue and air inlet
piping for blockage, proper
length, elbows, and
termination. Correct as
necessary.
· Check induced draft blower
and pressure sensor for
proper performance.
Replace, if necessary.
· See “Vent/Fl ue Pi pe”
section for piping
details.
· Replace induced draft
blower or pressure
sensor with proper
replacement part.
2
LED Flash codewill cease if power to the control module is interrupted through the disconnect or door switch.
☼
1 Flash
LED color is
AMBER.