Advertisement
CONTROL SYSTEM DIAGNOSTICS
Troubleshooting
The following visual checks should be made before
troubleshooting:
1. Check to see that the power to the furnace and the
blower control board is on.
2. The manual shutoff valves in the gas line to the
furnace must be open.
3. Make sure all wiring connections are secure.
4. Review the Sequence of Operation (see page 15).
Start the system by setting the thermostat above the room
temperature. Observe the system's response. Then use the
information provided in this section to check the system's
operation.
The furnace has a built-in, self-diagnostic capability. If a
system problem occurs, a fault code is shown by an LED
on the control board. The control continuously monitors its
own operation and the operation of the system. If a failure
occurs, the LED will indicate the failure code. The flash
codes are presented in Table 4.
Failure Codes
L
E
D
S
a t
u t
s
N
o
p
o
w
r e
L
E
D
O
f f
h
a
d r
w
a
e r
L
E
D
O
n
N
r o
m
l a
o
1
F
a l
s
h
F
a l
m
e
p
e r
2
F
a l
s
h
e
s
r P
s e
u s
e r
3
F
a l
s
h
e
s
r P
s e
u s
e r
4
F
a l
s
h
e
s
H
g i
h
i l
m
t i
5
F
a l
s
h
e
s
R
o
o l l
t u
s
6
F
a l
s
h
e
s
P
e r
s s
u
e r
7
F
a l
s
h
e
s
L
o
c
o k
t u
8
F
a l
s
h
e
s
L
c o
o k
t u
d
9
F
a l
s
h
e
s
I
c n
r o
e r
t c
Table 4
Page 18
F
a
u
t l
D
e
s
c
i r
t p
o i
n
o t
c
o
n
r t
l o
r o
c
o
n
r t
l o
a f
u
t l
d
e
e t
c
e t
d
p
r e
t a
o i
n
s
e
t n
i w
h t
g
a
s
v
l a
e v
o
f f
s
w
t i
h c
c
o l
e s
d
w
h t i
n i
d
c u
r e
o
f f
s
w
t i
h c
o
p
e
n
w
h t i
n i
d
c u
r e
o
n
s
w
c t i
h
o
p
e
n
w
c t i
h
o
p
e
n
s
w
c t i
h
c
c y
e l
o l
c
o k
t u
d
u
e
o t
n
o
g i
n
t i
o i
n
u
e
o t
o t
o
m
a
y n
a l f
m
e
d
o r
p
o
u
s t
n i l
e
o v
a t l
g
e
p
h
s a
n i
g
Fault Code History Button
The control stores the last five fault codes in memory. A
pushbutton switch is located on the control (see Figure 18).
When the pushbutton switch is pressed and released, the
control flashes the stored fault codes. The most recent fault
code is flashed first; the oldest fault code is flashed last.
To clear the fault code history, press and hold the pushbutton
switch in for more than 5 seconds before releasing.
REPAIR PARTS
The following repair parts are available from the local
distributor. When ordering parts, include the complete
furnace model number and serial number which are
printed on the rating plate located on the furnace.
Control Group
Transformer
High limit control
Auxiliary limit (if used)
Gas valve
Ignition/blower control board
Flame sensor
Heat Exchanger Group
Heat exchanger
Flue box cover
Blower Group
Blower housing assembly
Blower wheel
Blower mount
Burner Group
Gas manifold
Main burner orifices
Accessories
ALPKT572
Natural Gas to Propane Conversion Kit
ANGKT557
Propane to Natural Gas Conversion Kit
AFILTHA7
Single Side Filter Frame Kit
AFILT524
Side Return Filter Kit (Upflow Models)
AFILT525
Return Filter Kit (Counterflow Models)
AFILT529
Bottom Return Filter Kit
ATWIN579
Twinning Kit
ABASE511
Combustible Floor Base (14.5" cabinets)
ABASE512
Combustible Floor Base (17.5" cabinets)
ABASE568
Combustible Floor Base (21.0" cabinets)
ABASE569
Combustible Floor Base (24.5" cabinets)
Pressure switch
Blower door interlock switch
Combustion blower assembly
Flame rollout protector switch
Hot surface igniter
Combustion blower transition
Blower motor mount
Blower motor capacitor
Main burners
# 45464K003
Hide quick links:
Advertisement
