Lennox Hearth MPB3530CNE-B Indoor Fireplace User Manual


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NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
START CHECK
•TurnOffGasSupply.
•EnsureValveSwitchIsInONPosition.
•DisconnectControlHarness.
•TurnOnOptionalRemoteSwitch(if
applicable)
• Check for proper volt-
age at control harness
(see insert A). Voltage
should be 24V between
remote switch or pres-
sure switch and 24V
common and 24V hot.
NO
•Linevoltagepower
•Lowvoltagetransformer
•Limitcontroller
•RemoteSwitch
•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 measurements 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 PROCEDURE - ELECTRONIC IGNITION SYSTEM
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