DIGITAL CONTROL LOGIC - FLOW CHART
Power On
Is the water temperature displayed?
YES
Push MODE
switch to select "Pool" or "SPA"
Push Temp
arrow to scroll to
desired temperature
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
Flame icon displayed and flashing?
(pilot lit and rectified)
YES
Heater Fired?
YES
END
NO
NO
NO
NO
•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
Is SERVICE displayed and flashing?
YES
Diagnostic Readouts
"SNS" - Temperature sensor out of range (replace sensor)
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.
Sensor resistance at various temperatures
Temp Degrees F |
| 40 |
| 50 |
| 60 |
| 70 |
| 80 |
| 90 |
| 100 |
| 106 |
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Resistance (k) |
| 261.1 |
| 199.0 |
| 153.1 |
| 118.8 |
| 93.0 |
| 73.3 |
| 58.3 |
| 51.0 |
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If okay, replace Circuit Board |
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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
Verify power at MV on
Verify power to valve MV voltage. (Replace valve.)
46