Troubleshooting; General Heater Troubleshooting; Trouble Shooting Guide - Jandy LG125 Installation And Operation Manual

Model LG Pool and Spa Heater
SECTION 9.

Troubleshooting

9.2 Trouble Shooting Guide

# Symptom
1.
Pump not
operating
2.
Pilot outage
3.
Flame roll-out
on start-up
4.
Spillage at
draft hood
5.
Flame has
lazy yellow tip
6.
Not enough heat
7.
Heater pounding
or knocking
8.
Heater condensing A. Low water temperature
9.
Pressure relief
valve opens
10.
Pilot is lit but main
burners will not
come on
11.
Heater short
cycles
Cause
A. No power
B. Pump defective
C. Incorrectly wired
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 orifice
A. Blocked flue
B. Pilot out of position (delayed ignition)
C. Blocked heat exchanger
D. Refractory blanket out of place
E. Altered draft hood
A. Cold chimney
B. Vent pipe pitches down to chimney
C. Blocked chimney
D. Draft hood altered
E. Prefabricated chimney with incorrect cap
A. Low primary air
A. Inadequate gas supply
B. Low manifold gas pressure
C. Heater size inadequate
A. Inadequate water flow
through heater
A. Restriction in water flow system
at or downstream of heater.
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. Low water flow through heater
B. Failing hi-limit switch

9.1 General Heater Troubleshooting

The following table lists some of the more
common problems, causes and solutions encountered
when running the heater. Most problems occur when
the heater is being started for the first time after
installation or at Spring start-up. Careful installation
and maintenance will help ensure years of trouble free
use from your Lite2 pool heater.
Remedy
A. Check circuit breakers and power source.
B. Replace.
C. Recheck wiring.
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 orifice.
A. Remove blockage.
B. Correct pilot position.
C. Clean and correct as necessary.
D. Correct or replace blanket as necessary.
E. Install factory-provided draft hood.
A. Allow heater to operate 5 minutes to create draft action.
B. Reinstall vent pipe to pitch up from heater to chimney.
C. Remove blockage.
D. Install factory-provided draft hood.
E. Install U.L. listed vent cap.
A. Correct manifold pressure according to rating plate. Correct
orifice size if necessary (see parts list). Clean burner ports if
dirty.
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. for natural gas, 9.0"W.C. for propane.
C. Replace with heater of higher input.
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, increase pipe size or pump capacity or
locate obstruction. Check for closed valve in system.
A. Flue product moisture will condense at the start-up until the
heater water temperature reaches the normal operating
conditions.
A. Check for proper operation of all valves, bypass valve and
any equipment between pool and heater outlet.
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 flame 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 on page 18,
correct as necessary.
A. Increase size of pump or increase piping size.
B. Check High limit switches and replace as necessary.
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