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 qualied
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
qualied service personnel.
2. Identify and correct loose connections or replace switches.
Refer to qualied 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 qualied service personnel.
2. Identify and correct loose connections or replace vent
temperature limit. Refer to qualied 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
qualied 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 qualied 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 qualied 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