Page 34
LX/LT T
ROUBLESHOOTING
G
UIDE
#
Symptom
Cause
Remedy
1.
Pump not
A. No power
A.
Check circuit breakers and power source.
operating
B. Pump defective
B.
Replace.
C. Incorrectly wired
C.
Recheck wiring.
D. Time clock settings not
D.
Check time clock setting.
synchronized with actual time
2.
Flashback
A. Wrong gas
A.
Make sure gas supply matches gas indicated
on start-up
on rating plate.
B. Burner damage
B.
Replace burner.
3.
Lazy flame
A. Wrong gas
A.
Make sure gas supply matches gas indicated
with yellow tip
on rating plate.
4
.
Flame lifts and
A. Lean fuel/air mixture—
A.
Correct supply pressure to assure 3.0" W.C. (Nat.)
goes out (Low
Low supply pressure
or 9.0" WC (LP) manifold pressure when firing.
flame current).
B. Lean fuel/air mixture—
B.
Increase draft openings by sliding damper
Too much negative combustion
beneath burners (see Section 10.3).
chamber pressure (draft)
C. Lean fuel/air mixture—
C.
Increase draft openings by sliding damper
Low gas heat content
beneath burners (see Section 10.3).
5
.
Short "non-flying"
A. Rich fuel/air mixture—
A.
Correct manifold pressure to 3.0" WC (Natural)
flame (High
Hi manifold pressure
or 9.0" WC (LP)
flame current)
B. Rich fuel/air mixture—
B1. Locate and correct combustion system sealing
Too little negative combustion
deficiencies (see Section 10.3).
chamber pressure (draft)
B2. Decrease draft openings by sliding damper
beneath burners (see Section 10.3).
C. Rich fuel/air mixture—
C.
Decrease draft openings by sliding damper
High gas heat content
beneath burners (see Section 10.3).
6.
Not enough heat
A. Inadequate gas supply
A.
Gas meter too small. Gas line from meter to
heater too small.
B. Low manifold gas pressure
B.
Gas pressure on heater manifold, should be
adjusted to 3.0" W.C. for natural gas, 9.0" WC
for LP gas.
C. Heater size inadequate
C.
Replace with heater of higher input.
D. Temperature rise set
D.
Adjust temperature rise according to Section 7.6
incorrectly
of this manual.
7.
Heater pounding
A. Water flow through heater
A.
Check temperature rise according to Section 7.6
or knocking.
too low
of this manual. If temperature rise is too high,
check pipe size, pump capacity. Look for obstruction
or closed valve in system.
8.
Heater
A. Low water temperature
A.
Flue product moisture will condense at the start-up
condensing
until the heater water temperature reaches the
normal operating conditions.
B. Heater plumbed backwards
B.
Correct Plumbing.
9.
Igniter lights but
A. Gas valve not at “on” position
A.
Turn knob to “on” position.
main burners will
B. Air in gas line
B.
Cycle ignition sequence until air is out of the gas
not come on
line.
C. Gas valve failed
C.
Replace gas valve.
D. No power to gas valve
D.
Check controls for proper operation.
E. Low gas pressure
E.
Check supply pressure and manifold
pressure.
Table 10.
