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Legacy
™
Model LRZM Pool/Spa Heater Installation and Operation Manual
Table 8. Legacy Troubleshooting Guide
#
Symptom
Cause
Remedy
1.
Pump not operat-
ing
A. No power
B. Pump
defective
C. Incorrectly
wired
A. Check circuit breakers and power source.
B. Replace.
C. Recheck wiring.
2.
Pilot outage
A. Inlet gas pressure too low
B.
Inlet gas pressure too high causing
an unstable blowing pilot
C. Weak or defective thermocouple
D. Damaged pilot or thermocouple
E. Dirty
pilot
F.
Plugged or undersized pilot ori
fi
ce
A. Consult gas utility company. Inlet gas pressure to
heater should be 5.5" to 10.0" water column on natural
gas. 10.0" to 14.0" on propane gas.
B. Pressure should be regulated within limits shown above.
C. Replace
thermocouple.
D. Replace.
E. Blow dust or lint out of pilot.
F. Clean or replace pilot ori
fi
ce.
3.
Flame roll-out at
start-up
A. Blocked
fl
ue
B.
Pilot out of position (delayed ignition)
C. Blocked heat exchanger
D. Refractory tile out of place
E.
Altered vent cap
F.
Low gas pressure
A. Remove blockage.
B. Correct pilot position.
C. Clean and correct as necessary.
D. Clean and correct tile as necessary.
E. Install factory provide vent cap.
F. Check and correct gas pressure.
4.
Spillage at draft
hood
A. Cold chimney
B.
Vent pipe pitches down to chimney
C. Blocked
chimney
D. Altered draft hood
E.
Prefabricated chimney with incorrect cap
A. Allow heater to operate
fi
ve (5) minutes to create draft action.
B. Reinstall vent pipe to pitch up from the heater to chimney.
C. Remove blockage.
D. Install factory-provided draft hood.
E. Install U.L. listed vent cap.
5.
Lazy
fl
ame with
yellow tip
A. Low primary air / low gas pressure
A. Correct manifold pressure according to rating plate.
Correct ori
fi
ce size if necessary (see parts list). Clean
burner ports if dirty.
6.
Not enough heat
A. Inadequate gas supply
B. Low manifold gas pressure
C. Heater size inadequate
D. Low temperature rise
A. Gas meter too small. Gas line from meter to heater too small.
B. Gas pressure on heater manifold, should be adjusted
to 4.0" W.C. (natural gas), 9.0" W.C. (propane gas).
C. Replace with heater of higher input.
D. Check and correct water
fl
ow.
7.
Heater pounding
or knocking
A. Inadequate water
fl
ow through heater
A. Check temperature rise between inlet and outlet heater
piping. See section 7.6 for recommended range of
temperature rise. If temperature rise is above the maximum
recommended, check for closed valve in system.
8.
Heater condens-
ing
A. Low water temperature
A. Flue product moisture will condense at the start-up until the
heater water temperature reaches the normal operating
conditions.
9.
Pressure relief
valve opens
A. Restriction in water
fl
ow system at or
downstream of heater
A. Check for proper operation of all valves, bypass valve and
any equipment between pool and heater outlet.
10.
Pilot is lit but main
burners will not
come on
A.
Gas valve not at “on” position
B.
Hi-limit switches failed
C. Pressure switch failed or out of
adjustment
D. Fusible link failed
E.
Gas valve failed
F.
Broken wire in thermostat circuit or
defective thermostat
G. Heater wired incorrectly
A. Turn knob to “on” position.
B. Investigate reason for overheating and replace hi-limit switch
as necessary.
C. Adjust pressure switch (see Section 7.5) or replace as
necessary.
D. Investigate reason for
fl
ame rollout and replace fusible link as
necessary.
E. Check and replace gas valve as necessary.
F. Check continuity through thermostat circuit with wires
disconnected.
G. Check heater wiring against wiring diagram in Section 6,
correct as necessary.
11.
Heater short
cycles
A. Low
water
fl
ow through heater
B.
Failing hi-limit switch
A. Increase size of pump or increase piping size.
B. Check hi-limit switches and replace as necessary.
Summary of Contents for Legacy LRZM
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