45
SERVICING
Complaint
No Heat
Unsatisfactory Heat
POSSIBLE CAUSE
DOTS IN ANALYSIS
GUIDE INDICATE
"POSSIBLE CAUSE"
SYM
PT
O
M
Sy
st
em
Wi
ll N
ot
S
tar
t
Bur
ner
Won'
t I
gni
te
Bur
ner
Igni
tes
-Loc
ks
O
ut
Bur
ner
Li
ght
s -
Li
ttl
e or
N
o A
ir T
hr
ough V
ent
s
Bur
ner
S
hut
s O
ff pr
ior
to T
'S
tat
bei
ng S
at
as
fied
Shor
t C
yc
les
Long C
yc
les
Soot
and /
or
F
um
es
To M
uc
h H
eat
N
ot
E
nough H
eat
Test Method
Remedy
See S
er
vi
ce P
ro
ced
ur
e R
ef
er
en
ce
Power Failure
•
Test Voltage
S-1
Blown Fuse
•
Test Voltage
S-1
Loose Connection
•
Check Wiring
S-2, S-3
Shorted or Broken Wires
•
Check Wiring
S-2, S-3
No Low Voltage
•
Check Transformer
S-4
Faulty Thermostat
•
• •
•
Check Thermostat
S-3
Faulty Transformer
•
Check Transformer
S-4
Poor or High Resistance Ground
•
Measure Ground Resistance
S-313
Improper Heat Anticipator Setting
• •
• •
Adjust Heat Anticipator Setting
S-3
Improper Thermostat Location
• •
• •
Relocate Thermostat
Faulty Limit or Roll Out Switch
•
•
Test Control
S-300-302
Faulty Flame Sensor
•
Test Flame Sensor
S-314
Faulty Ignition Control
• • • •
Test Control
S-313
Gas Valve or Gas Supply Shut Off
•
Turn Valves to On Position
S-304
Faulty Induced Draft Blower
• •
•
Test Blower
S-303
Dirty Flame Sensor, Low uA
•
Clean Flame Sensor
S-314
Flame Sensor not in Flame, Low uA
•
Test/Adjust Position of Flame Sensor
S-314
Faulty Gas Valve
•
•
•
Replace Gas Valve
S-304
Open Auxillary Limit
•
• •
Check Blower Speed, Rotation, Belt, Pulleys, Duct
Static, Filter
S16A,16D,200,
201,205,206,207
Improper Air Flow or Distribution
• •
•
Check Blower Speed, Rotation, Belt, Pulleys, Duct
Static, Filter
S16A,16D,200,
201,205,206,207
Faulty Blower Motor, Belt, or Pulley
•
Check Blower Speed, Rotation, Belt, Pulleys, Duct
Static, Filter
S16A,16D,200,
201,205,206,207
Locking out on Main Limit
•
•
•
Check Limit, Gas Press., Temp. Rise, Blower
Rotation, Belt, Pulleys, Duct Static, Filter
S-300,
307, 201
Delayed Ignition
•
Test for Delayed Ignition
S-308
Flashback
•
Test for Flashback
S-309
Orifice Size
• • •
Check Orifices
S-306
Gas Pressure
•
• • •
Check Gas Pressure
S-307
Cracked Heat Exchanger
•
Check Burner Flames
S-302
Stuck Gas Valve
•
• •
Replace Gas Valve
S-304
Furnace Undersized
•
Replace with Proper Size Furnace
Faulty Pressure Switch
• •
•
Test Pressure Switch
S-310
Blocked or Restricted Flue
•
Check Flue/Drawdown Pressure
S-310
Open Roll Out Switch
• •
Test Control
S-302
Bouncing On Pressure Switch
•
Test Negative Pressure, Flue Blockage
S-310
GAS HEATING ANALYSIS CHART
Содержание DRG0361DL00001S
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