Troubleshooting Chart - Williams AC2030 Owner's Manual

TROUBLESHOOTING
YOUR FURNACE
ISSUE
1. Furnace won't turn on
2. Furnace calls for heat but
won't ignite
3. Furnace operates but turns
off before room temperature
is attained
POSSIBLE CAUSE(S)
A. AC power is not connected
B. Control module power
button is set to OFF
C. Thermostat is set to OFF
D. Thermostat cable is not
connected
A. Exhaust vent not installed
correctly and not closing
safety switch
B. Gas supply off
C. Unit is overheating, high
temp limit switch tripped
D. Hot surface igniter failed
E. Thermostat not calling
for heat
F. Plugged furnace orifice.
G. Defective thermostat
H. Defective valve.
I. Combustion fan is defective
J. Control module defective
K. Ignition Module defective
L. Temperature probe faulty
M. Ground is not connected
A. Thermostat location..
B. Defective thermostat.
C. Unit is overheating, high
temp limit switch tripped
D. Room fans defective
E. Flame sensor defective
F. Exhaust vent is blocked
CORRECTIVE ACTION
A. Check power cord connection
B. Control module power ON
C. Turn thermostat to ON
D. Connect thermostat cable
A. Verify exhaust vent is installed per
instructions
B. turn on gas supply
C. Verify nothing is blocking the front panel,
check circulation fan operation
D. Replace igniter
E. Increase Set Point Temperature
F. Check clean or replace.
G. Replace thermostat
H. Check connections at valve terminals. If valve
operates, Check for blocked burner orifices.
I. Check wiring connections or replace
J. Replace control module
K. Replace ignition module
L. Check wiring connections or replace
M. Check wiring connections or replace
A. Check thermostat location. It should not be in
the path of warm air discharge from furnace,
near a lamp or above a T.V. or stereo unit.
B. Check thermostat calibration or replace.
C. Verify nothing is blocking the front panel,
check circulation fan operation
D. Verify room fan operation
E. Replace flame sensor
F. Verify exhaust vent is installed per
instructions
(Continued on next page)
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