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Installation and Operation Manual
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Legacy™ Model LRZM Pool/Spa Heater
table 8. legacy troubleshooting Guide
#
symptom
Cause
remedy
1.
Pump not oper-
ating
A. No power.
B. Pump defective.
C. Incorrectly wired.
A. Check circuit breakers and power source.
B. Replace pump.*
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 or thermopile.
D. Damaged pilot, thermocouple or thermopile.
E. Dirty pilot.
F. Plugged or undersized pilot orifice.
G. Plugged burner orifice(s).
A. Consult gas utility company. Inlet gas pressure to
heater should be 13.7 to 24.9 mbar on natural
gas. 24.9 to 34.8 mbar on propane gas.*
B. Pressure should be regulated within limits shown above.*
C. Replace thermocouple or thermopile.*
D. Replace.*
E. Blow dust or lint out of pilot.*
F. Clean or replace pilot orifice.*
G. Remove and clean all orifices.*
3.
Flame roll-out at
start-up
A. Blocked flue.
B. Pilot out of position (delayed ignition).
C. Blocked heat exchanger.
D. Refractory blanket 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 blanket as necessary.*
E. Install an unaltered factory approved 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 five (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 flame with
yellow tip
A. Low primary air.
B. Incorrect burner pressure.
A. Check for internal burner obstructions.*
B. Adjust burner pressure according to rating plate.*
Clean burner ports if dirty.*
6.
Not enough heat A. Inadequate gas supply.
B. Low burner 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 burner should be adjusted to the
values list in Table 2.*
C. Replace with heater of higher input.*
D. Check and correct water flow.*
7.
Heater pounding
or knocking
A.
Inadequate water flow through heater.
A. Check temperature rise between inlet and outlet heater
piping. See section 11.6 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 flow 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. Roll-out switch (fusible link) failed.
E. Gas valve failed.
F. Broken wire in thermostat circuit or
defective thermostat.
G. Heater wired incorrectly.
H. Vent temperature limit failed.
A. Turn knob to “on” position.
B. Investigate reason for overheating and replace hi-limit switch
as necessary.*
C. Adjust pressure switch (see Section 11.5) or replace as
necessary.*
D. Investigate reason for flame rollout and replace roll-out
switch 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.*
H. Thoroughly investigate the causes for vent temp limit failure,
correct the problem and replace the vent temp limit.
11.
Heater short
cycles
A. Low water flow 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.*
*
Must be performed by a qualified professional pool technician.
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