User Guide

37
Troubleshooting continued-
LEDStatus ControlStatus ProbableCause
Sixflashes‐three
flashes,threesecond
pause(Softlockout)
Pilotflame
extinguished.
Systemresetsafter5
minutes.
1.Unstablepilot.
2.Pilottubeblockedorrestricted.
3.Oxidationbuilduponpilotelectrode.
4.Wiredamagetopilotassemblyorbad
connectionatgasvalve.
5.Insufficientcombustionair.
Sixflashes‐four
flashes,threesecond
pause(Softlockout)
Undesired‐falsepilot
flamesensed.
Systemautoresets.
Pilotvalvestuckinopenposition.
Sevenflashes,three
secondpause
Flammablevapor
sensorfaultdetected,
seewarninglabel
1.Flammablevaporpresent
2.Flammablevaporsensorexposedtoexcessive
moisture
3.Flammablevaporsensorexposedtoextreme
ambienttemp
4.Simulatedresistivedeviceremovedoroutofrange
(ifapplicable).
Eightflashes‐oneflash,
threesecondpause
Flammablevapor
sensoroutof
specification.Possible
short.
1.Flammablevaporsensoroutofspecification
2.Possibleshort
Eightflashes,two
flashes,threesecond
pause
Temperaturesensor
fault
1.Damagetosensororwireincontrol’swell.
2.Control’ssensorresistanceoutofrange.
3.ReplaceControl.
Eightflashes‐three
flashes,threesecond
pause
Electronicsfault
detected
1.Verifycontrolisnotwetorphysicallydamaged
2.Resetcontrolon/offswitch.
3.Replaceelectronicmoduleif8‐3errorpersists
Eightflashes‐four
flashes,threesecond
pause
Gasvalvefault
detected.
1.Verifycontrolisnotwetorphysicallydamaged
2.Resetcontrolon/offswitch.
3.Replacegascontrolif8‐4errorpersists
Control Sequence of Operation
Start up Sequence
Upon powering up, the control checks for the presence of the resistive plug, if the resistance is in
the expected range the control will begin normal operation after 5 to 8 seconds.
Normal Heating Sequence
1. The thermostat senses a need for heat.
2. The control checks the pressure switch condition.
3. If the pressure switch is open, the control sends power to the blower motor.
4. The blower starts moving combustion air through the combustion system.
5. The pressure switch closes.
6. The control senses the closed pressure switch and starts the ignition process by providing a
spark at the pilot electrode and allowing gas to flow to the pilot.
7. When the pilot is lit the gas control senses the pilot flame and opens the main gas valve.
8. The main burner is lit.
9. The main burner and blower continue to operate until the thermostat is satisfied.
10. When the thermostat is satisfied the main and pilot gas valves close.
11. The blower operates for a short post purge period before shutting down.
12. The water heater remains in the stand-by mode until the next call for heat.