P/N
241417
Rev 4
Effective: 12-04-12
Replaces: 10-07-11
Page 13
STATUS AND
DIAGNOSTICS
The digital thermostat models are programmed to display a variety of status and diagnostic messages, depending on the
operating conditions.
NOTE:
The LCD temperature display may not agree with the temperature reading of your pool or spa thermometer. The
heater reads the water temperature at the inlet. Due to the circulation characteristics of any pool or spa, the water tem-
perature at the inlet to the heater may differ from that observed at a given location in the pool or spa.
Display
Condition
Heating
Call for heat established, flame present
Spark
Spark operating
No Demand
Heat demand is satisfied
The following conditions are displayed in Pool, Spa and Re-
mote modes.
Display
Condition
Sensor Failure
Thermistor temperatures disagree by
more than 2°F
Sensor Open
Thermistor sensor failed open.
(Below -20°F)
Sensor Short
Thermistor sensor failed short.
(Above 217°F)
Flame w/o
CFH
Board is sensing flame when both main
and pilot valves are commanded shut.
PV Output
Fault
Pilot gas valve output is not in com-
manded state.
MV Output
Fault
Main gas valve output is not in com-
manded state.
LoNox Tab
Fault
Voltage is sensed at the Lo NOx termi-
nal on a non-Lo NOx heater (Lo NOx
tab is intact).
Internal Fault
Board fault, replace board.
EEPROM Fault
Memory fault, reset set points, replace
board if fault does not clear.
Clock/ Fire-
man Sw
Time clock/fireman switch circuit is
open.
Low Temp
Lockout
Water temperature below 36°F.
The following heat status messages are displayed in Pool,
Spa, and Remote modes when there are no active fault con-
ditions.
The following conditions are displayed only while there is a
demand for heat present.
Display
Condition
Water Sw Open
Water pressure switch open.
Vent/Field
Sw #1
Vent spill switch/field switch #1 open.
Hi Limit 1 Fault
High limit 1 open.
Hi Limit 2 Fault
High limit 2 open.
Rollout Sw Open
Rollout switch open.
Flow/Field SW #2
Flow switch/field switch #2 open.
Fan Lockout
3 fan switch faults within same heat
demand cycle, power must be cycled
to clear the fault.
Fan 5 Min Delay
Heater shut down for 5 minutes be-
cause LoNox fan switch didn't close.
Ignition Lockout
(Propane Tab
Broken)
Alternating with “No pilot sensed” -
Pilot flame not established within the
required time (15 sec or 90 sec).
Alternating with “Main Ign Failure” -
Pilot flame lost during the 8 second
trial to ignite the main burner.
Ignition Failure
(Propane Tab
Not Broken)
Alternating with “No pilot sensed” -
Pilot flame not established within 90
seconds.
Ign 6min Delay
(Propane Tab
Not Broken)
Alternating with “Main Ign Failure”
-
Pilot flame lost 4 times within the 8
second trial to ignite the main burner.
Heater will lockout for 6 minutes be-
fore retrying.
