35
STATUS AND DIAGNOSTICS
T
he digital thermostat models are programmed to display a variety of status and diagnostic messages, depend-
ing on the operating conditions.
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
o
r spa, the water temperature 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 Remote 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 command-
ed 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 ter-
minal 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/
Fireman 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 conditions.
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
Field-supplied 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
because LoNox fan switch didn't
close.
Ignition
Lockout
(Propane Tab
Broken)
Alternating with “No pilot
sensed” - Pilot flame not estab-
lished 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 estab-
lished 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 before retrying.
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