Advertisement
LED Troubleshooting
--
Error
Code
SYMPTOM
CAUSE
REMEDY
Hardware
failure.
Loss of power
to control
module
Check
5 amp
fuse on IGC,
power
to unit, 24-v
circuit
(LED
OFF)
(IGC).
breaker,
and transformer.
Units without
a 24-v
circuit
breaker
have an internal
overload
in the 24-v trans-
former.
If the overload
trips, allow
10 minutes
for au-
tomatic
reset.
Limit
switch
fault.
High temperature
limit switch
is
Check
the operation
of the indoor
(evaporator)
fan
(LED
2 flashes)
open.
motor.
Ensure
that the supply-air
temperature
rise is
in accordance
with the range
on the unit nameplate.
Flame
sense
fault.
The IGC sensed
flame
that
Reset
unit. If problem
persists,
replace
control
board.
(LED
3 flashes)
should
not be present.
4 consecutive
limit
switch
Inadequate
airflow
to unit.
Check
operation
of indoor
(evaporator)
fan motor
and
faults,
that supply-air
temperature
rise agrees
with range
on
(LED
4 flashes)
unit nameplate
information.
Ignition
lockout.
Unit unsuccessfully
attempted
Check
ignitor
and flame
sensor
electrode
spacing,
(LED
5 flashes)
ignition
for 15 minutes,
gaps,
etc. Ensure
that flame
sense
and ignition
wires
are properly
terminated.
Verify
that unit is obtaining
proper
amount
of gas.
Induced-draft
motor
fault.
IGC does
not sense
that induced-
Check
for proper
voltage.
If motor
is operating,
check
(LED
6 flashes)
draft motor
is operating,
the speed
sensor
plug/IGC
Terminal
J2 connection.
Proper
connection:
PiN
1 -- White,
PIN 2 --
Red,
PIN 3 -- Black.
Rollout
switch
fault.
Rollout
switch
has opened.
Rollout
switch
will automatically
reset,
but IGC will
(LED
7 flashes)
continue
to lockout
unit. Check
gas valve
operation.
Ensure
that induced-draft
blower
wheel
is properly
secured
to motor
shaft.
Reset
unit at unit disconnect.
Internal
control
fault.
Microprocessor
has sensed
an
If error code
is not cleared
by resetting
unit power,
(LED
8 flashes)
error in the software
or hardware,
replace
the IGC.
IMPORTANT:
Refer to Heating troubleshooting
chart for additional
troubleshooting
analysis.
LEGEND
IGC
--
Integrated Gas Unit Controller
LED
--
Light-Emitting
Diode
--36--
Advertisement
