NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
28
START CHECK
•TurnOffGasSupply.
•EnsureValveSwitchIsInONPosition.
•DisconnectControlHarness.
•SetThermostatToCallForHeat.
•Check for proper volt-
age at control harness
(see insert A). Voltage
should be 24V between
thermostat or pressure
switch and 24V common
and 24V hot.
NO
•Linevoltagepower
•Lowvoltagetransformer
•Limitcontroller
•Thermostat
•Wiring
YES
•Plug control harness into
valve. Wait for internal check
delay.
•Igniter warmsupand glows
red.
NO
•With pilot burner cable con-
nected, measure voltage at
valve HSI element output. 24V
nominal. (See insert B)
NO •Replacevalve.
YES
YES •Replaceigniter/amerod
assembly.
YES
•Turnongassupply.
•Pilotburnerlights.
NO •Checkthatpilotgasisowing.Wait
to ensure pilot gas tubing is purged.
Recycle call for heat if necessary.
NO •Replacevalve.
YES
YES
•Measurevoltagebetween24Vhotand
24V common leads to valve control.
Must measure at least 19.5 VAC with
igniter powered (see insert A). To
identify proper lead, this check must
be done with the valve control con-
nected and igniter powered.
NO •Checktransformerand
line volt supply.
YES
•ReplacePilotAssembly.
•Main valveopensand main
burner lights.
NO
•Checkthat pilotamemakesgood
contact with pilot burner flame rod.
•Checkforgoodelectricalconnection
through the pilot tubing.
•Ifbothoftheabovearegood,replace
igniter/flame rod assembly.
YES YES
•SystemIsokay. •Cyclethermostatoffandbackon.
Igniter will cycle off and back
on once during the 90 second
ignition trial. All voltage mea-
surements must be taken while
the igniter is powered.
When measuring voltage
at connections, use care
to ensure terminals are
not damaged.
•Mainburnerlights.
NO
•Replacevalve.
Insert A
End View of Control Harness Connector
24 Volt
Common
24 Volt Hot
24 Volt
Switched
Check For Damaged or Missing
Terminals in Connector
Insert B
Igniter Terminals
1
2
2
1
2
1
TROUBLESHOOTING THE ELECTRONIC IGNITION SYSTEM