Specifications
Display Fault Cause Remedy
Display shows
NO FLOW
1. Pump is not running.
2. Low pump pressure.
3. Pressure switch fault.
1. This is a normal display when the pump is OFF. No
Service Required.
2. Clean lter or clear blockage, check position of valve
in plumbing system.
3. Adjust or replace pressure switch. Refer to qualied
service personnel.
FAULT-
HIGH LIMIT
1. Water temperature in heater exceeds the
internal limit.
2. Limit switch fault.
1. Verify function of high limit switches. Perform temperature
rise test. Identify and correct cause of overheating. Refer to
qualied service personnel.
2. Identify and correct loose connections or replace switches.
Refer to qualied service personnel.
FAULT-
FUSELINK/FIELD
1. Roll-out switch (fusible link) fault.
2. Vent temperature limit fault.
1. Identify and correct loose connections or replace
roll-out switch (fusible link). Check for and correct any
downdraft condition. Refer to qualied service personnel.
2. Identify and correct loose connections or replace vent
temperature limit. Refer to qualied service personnel.
FAULT-
CHECK IGN CONTROL
1. Air ow restricted at intake or discharge.
2. Oscillating pump pressure.
3. Low gas supply pressure.
4. No ame at burners.
1. Check for proper clearances around heater and for
adequate room ventilation if enclosed. Inspect for
blockage or restriction at discharge of ue. Refer to
qualied service personnel.
2. Clean lter or identify and repair cause of pump oscillation.
3. Identify and repair incorrect supply pipe size or pipe line
blockage.
4. Identify and correct loose wiring connections, or problems
with igniter, ame sensor, gas valve, or ignition control.
Refer to qualied service personnel.
FAULT-
SHORTED H2O SENSOR
or
FAULT-
OPEN WATER SENSOR
1. Faulty wiring or connection.
2. Failed sensor.
1. Inspect sensor wiring. Ensure sensor is connected into
Power Interface Board.
2. Replace temperature sensor. Refer to qualied service
personnel.
Table 9. Legacy Model LRZ Electronic Heater Service Diagnostic Guide
Page 35
ENGLISH
Jandy
®
Legacy™ Model LRZE Pool/Spa Heater by Zodiac
®
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Installation and Operation Manual