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START
Is LED status light ON solid, alternately
flashing
bright--dim-bright-dim
like a
heartbeat,
or flashing
ON and OFF?
YES
,r
I
Is LED status
ON solid?
light
I
Is LED status light alternately
flashing
bright_imJaright_im
like a heartbeat?
"°
Determine
status code.
The status code
is a single or two digit number with the
first number
determined
by the number
of
short flashes and the second number
after the plus (+) sign, the number of long
flashes.
1
i
o to section below for the flashed status
code.
1
Troubleshooting
Guide -
Is there 115V at L1 and NEUTRAL?
YES
Is there 24V at 24VAC and COM?
YES
Is the 24V fuse open?
YES
Inspect secondary
voltage
(24V) wiring,
including
thermostat
leads for short
circuit.
Replace fuse
Replace furnace
control.
The control is locked out and will auto-
reset after 1 hour.
Lockout
could be due
to any of the following:
-
Flame sense circuit failure.
-
Gas valve
relay stuck open.
-
Software
check error.
Reset power to clear lockout.
Replace
control
if code repeats.
i
I E--4S
To recall a status code: Briefly (2 - 3
seconds)
connect
the TEST/TWIN
terminal
to the "C" thermostat
terminal with a jumper
wire to begin status code recovery
and
component
test. If a previous status
code is
present,
the code will repeat 4 times then
go on to component
test. If no previous
code is present, a component
test will
begin without flashing
any status codes.
Component
Test Sequence:
Gas valve
and humidifier
will not be turned on.
Inducer motor will start and remain on until
the end of the blower test, then off. The
following
components
are on for 10 -15
seconds
each individually:
hot surface
igniter,
blower speeds:
FAN (if present),
HEAT,
COOL.
!
Was there a previous status code?
F.o
Single Stage
Is door switch closed?
YES
Is there 115V going to switch?
YES
I
Replace
door switch.
-_
Replace transformer.
Does the control respond
to W, Y1, Y/Y2,
and G (24V) thermostat
signals?
_L YES
Run system through
a heat, or cooling
cycle to check operation.
Status codes
are erased after 72 hours.
I
Replace furnace
control.
NO
Close the door switch.
NO
Is circuit breaker closed?
YES
I
I
Check for continuity
in wire from circuit
g
I
breaker to furnace.
I
I
Close circuit breaker
and go backto
I
START.
I
heck room thermostat
or
interconnecting
cable.
Is 24V present
at W, Y1, Y/Y2 or G
thermostat
terminals
on the furnace
control?
YES
i
i
Disconnect
all the thermostat
wires from
the furnace
control.
Does the problem
repeat when using a
jumper
wire?
.°
The thermostat
is not compatible
with the
furnace
control.
Either install a ballast
resistor,
connect the C furnace
control
thermostat
terminal to the thermostat,
or
replace
the thermostat.
I
NC
P
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F
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