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If the PRS fault code is displayed, it indicates that
there is insufficient water flow through the heater.
Make sure the pool filter and pump strainer are clean
before calling a service representative.
DIAGNOSTICS
The digital thermostat models are equipped with on-
board diagnostic controls. If there is a safety fault, a
fault code will be displayed along with a service
indication.
READING A FAULT
The word “SERVICE” will flash on and off if the PC
board detects a known fault. The fault will be dis-
played in three big letters on the lower left of the dis-
play.
Fig.# 9482
Fig.# 9485
Service Will
Flash
3 Letter
Fault Code
See table
for fault
definition
STATUS CODES
Display Definition
CFH Call for heat
CLK Time clock
EOL End of line test (Factory Use Only)
LON Low NOx Unit
LOW Caution-low water temperature
OFF Off mode
PRO Propane gas configured
REM Remote control activated
SPK Spark
SPR Spare fault code indicator
FAULT CODES
Display Definition
BD1 Board failure
EEP Microprocessor error
FAN Blower pressure failure
FFL Flame sensing when pilot and gas
valves are closed
GVC Gas valve closed
GVO Gas valve open
HL1 High limit switch #1 open
HL2 High limit switch #2 open
IGN Ignition failure
ILO Ignition lockout
PLT Pilot failure
PRS Water pressure switch open
ROL Heat roll-out safety switch open
SNS Sensor failure
VNT Vent switch open
PROGRAM MODES
Display Definition
CCC Celsius setting
F/C Change from Fahrenheit to Celsius
FFF Fahrenheit setting
RES Reset defaults
SET Set point max adjustment
NOTE: The LCD temperature display may not agree with the temperature reading of your pool or spa ther-
mometer. The heater reads the water temperature at the inlet. Due to the circulation characteristics of any pool
or spa, the water temperature at the inlet to the heater may differ from that observed at a given location in the
pool or spa.