Goodman [A/G]PG, Service Instructions Manual

Page: 26 / 52

SERVICING
26
GAS HEATING - SERVICE ANALYSIS GUIDE
Complaint No Heat Unsatisfactory Heat
POSSIBLE CAUSE
DOTS IN ANALYSIS
GUIDE INDICATE
"POSSIBLE CAUSE"
SYM
PT
OM
Sy
s
tem
W
ill N
o
t St
art
B
u
rn
e
r Wo
n
't Ig
n
ite
B
u
rn
e
r Ig
n
ite
s-
L
o
cks O
u
t
Burner Shut
s
Of
f prior t
o
T
'St
at
being Sat
as
fi
ed
Short
C
y
c
les
Long C
y
c
les
Soot
and /
o
r F
u
m
e
s
To
Mu
ch
He
a
t
N
o
t Enough H
eat
Test Method
Remedy
S
ee S
e
rv
ice P
rocedur
e Ref
e
re
nce
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 Airflow
S-200, 201
S-300, 301
Improper Air Flow or Distribution
• • •
Check Duct Static S-200
Locking out on Main Limit
• • •
Check Limit, Gas Press., & Temp. Rise
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
Unit Undersized
• •
Replace with Proper Size Unit
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
Unit Oversized
• •
Replace with Proper Size Unit