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Power On
Is the water
temperature displayed?
NO
YES
Push MODE
switch to select
"Pool" or "SPA"
Push Temp
arrow to scroll to
desired temperature
NO
Water temperature
and set
temperature
displayed?
YES
CFH
(call for heat) will
display briefly
SPK
(spark) will display
until pilot is lit
up to 2
minutes maximum
NO
NO
YES
YES
Flame icon displayed
and flashing?
(pilot lit and rectified)
Heater Fired?
END
• Check On/Off switch (under lid on control panel)
• Check for 120/240 volts to the transformer
(time clock, circuit breaker, wire connections)
• Check for 24 volts to Circuit Board (P6 connector)
REM and Water Temperature
displayed and flashing
(a remote control is controlling the heater)
Note: Disconnect the remote by turning the
remote function off. See page 35 for instructions.
NO
YES
Is SERVICE displayed and flashing?
Diagnostic Readouts
"SNS" - Temperature sensor out of range (replace sensor)
Verify power at MV on P-4 Terminal on digital circuit board.
Verify power to valve MV voltage. (Replace valve.)
Sensor Failure
Inspect thermister, wires, and connector at Terminal P1
Check resistance value of the thermister. Reference to chart below.
Replace thermister if not within 10% of values shown below.
If okay, replace Circuit Board.
Temp Degrees F 40 50 60 70 80 90 100 106
Resistance (k) 261.1 199.0 153.1 118.8 93.0 73.3 58.3 51.0
If okay, replace Circuit Board
Sensor resistance at various temperatures
PRS Pressure switch. Verify water flow and pressure
CLEAN FILTER / STRAINER - backwash if neccessary.
HL1 High limit switch. Verify water flow. Inspect internal
HL2 Thermostat (Unitherm Governor) and bypass valve.
ROL Rollout Sensor - Check for blocked heat exchanger and soot.
Atmospheric Units - Replace fusible link.
Low NOx Units - Press manual reset button.
CLK Fireman or Remote switch connected to safety loop is in the
OFF mode.
VNT Vent switch open. Check connections to the board.
If extractor installed, troubleshoot extractor.
IGN Ignition control failure. Check power at PV.
PLT Pilot failure. Check spark (bad ignition circuit or hi-tension wire).
Verify gas to the heater. Verify valve operation (gas present at
tube fitting). Verify clean pilot orifice and clearance from
igniter to ground hood. If pilot is lit, verify that the flame is
rectified (the spark will be off)
DIGITAL CONTROL LOGIC - FLOW CHART