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6.0 Trouble-Shooting
Symptom Cause Check Remedy
1. Burner does not a) Air pressure switches a) Check pressures in a) Change pressure
start initially. not making. duct at location of connections where
switch connections. a more positive
b) Faulty pressure b) Check electrical pressure is present.
switches. portion of switch.
2. Burner kicks out a) Low gas pressure a) Check low pressure a) Reset
shortly after start-up. switch set too high. switch setting.
3. Pilot will not ignite on a) Raw gas fed into pilot a) Check spark plug for a) Adjust pilot gas cock by
initial light-off. causing carbon hair on carbon hair; also check first screwing needle
spark plug. gap on plug (should be closed, then with trans-
3/64" - 3/32". former powered, open
needle slowly 1/4 turn
at a time.
4. Flame failure when a) Gas pressure to pilot a) Check pilot gas pressure a) Relocate pilot gas line or
burner goes to high fire. regulator too high. to regulator (should be use second pilot
1 PSIG maximum). regulator.
b) Bolts which fasten pilot b) Check tightness of bolts. b) Tighten bolts.
casting to burner are not c) Clean impulse line of any
tight enough. c) Check impulse line for dirt particles and relocate
c) Pilot regulator not react- possible dirt clogging; duct connection to trans-
ing fast enough to duct also check impulse line mit maximum duct
pressure changes. duct connection to pressure.
d) Check valve stuck open. determine if an effective d) Clean check valve.
pressure is being trans-
e) Too much pilot gas. mitted to regulator. e) Reduce pilot gas flow.
5. Flame failure when main a) Gas pressure to pilot a) See Check 4a. a) See Remedy 4a.
burner returns from high regulator.
to low fire. b) Under-gassing pilot. b) Check pilot regulator b) Open needle on pilot
inlet and outlet gas adjusting cock slowly
pressures; also check 1/4 turn at a time.
pilot flame.
c) See Check 4c. c) See Remedy 4c.
6. Main flame too large at a) Gas pressure too high a) Check gas pressures. a) Screw out on main gas
high fire. at burner inlet. pressure regulator.
Adjust linkage on gas
b) Combustion air pressure b) Check air pressure control valve to hold
too low. differential. valve less than full open
when at high fire.
c) Check valve stuck open. b) Open air shutter on
makeup air blower.
c) Clean check valve.
7. Main flame not a) Air pressure a) Check air pressure a) Close air shutter on
extending beyond face differential too high. differential between makeup air blower.
of burner at high fire. b) Burner not firing rated combustion air manifold b) Screw in on main gas
input. and main duct. pressure regulator to
b) Check gas pressure provide more gas.
c) Burner gas holes differential. c) Clean gas holes with #42
plugged. c) Check gas holes for dirt MTD drill. Clean air
or lint. holes with #27 MTD
drill.
8. Main flame long and a) Velocity past burner a) Check velocities and a) Open shutter on
yellow. lower than 500 FPM. rotation of main makeup air blower.
b) Check valve stuck open. circulating fan. b) Clean check valve.
Info 140 11/4/03