Model reference

Lennox G61MPV-36B-071

Name: Lennox G61MPV-36B-071
Brand: Lennox

Furnace

1 document31 error codes2 service modes

Available documentation

Service Manual

G61MPV Service Literature103 pg
Covers this model

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Low flame current during run mode

From Service Manual 339202, p.14:

1.Access service mode to confirm the active fault code and read stored error history.

2.Measure control board supply voltage at test points. Expected: 12 VDC and 5 VDC.

3.Inspect all connectors on the main control for corrosion or backed-out pins.

Part WPW10804018

Electronic control board

Error codes (31)

CodeMeaning

1+2Low flame current during run mode (Board 100870).1+3Flame sensed out of sequence 2+3Low pressure switch failed open (Board 100870).2+4Low pressure switch failed closed (Board 100870).2+5High pressure switch failed open (Board 100870).2+6High pressure switch failed closed (Board 100870).2+7Low pressure switch opened during ignition trial or heating demand (Board…3+1Limit switch open (Board 100870).4+1Watchguard 4+2Watchguard 4+3Watchguard 4+5Watchguard 4+6Watchguard 4+7Ignitor circuit fault 4+8Low line voltage (Board 100870).5+1Hard lockout 5+2Control failed self check, internal error; control will restart if error…5+3No earth ground; control will restart if error recovers (Board 100870).5+4Reversed line voltage polarity; control will restart if the error recovers…5+6Low secondary (24VAC) voltage (Board 100870).DS1 Alternating Fast Flash / DS2 Alternating Fast FlashDuring ignitor warm-up period only DS1 Alternating Slow Flash / DS2 Alternating Slow FlashWatchguard DS1 Fast Flash / DS2 Fast FlashNormal operation DS1 Fast Flash / DS2 Slow FlashMain power polarity reversed DS1 OFF / DS2 Fast FlashHigh prove switch open; or blocked inlet/exhaust vent; or high prove switch…DS1 OFF / DS2 ONFlame sensed without gas valve energized.DS1 OFF / DS2 Slow FlashLow prove switch open; or blocked inlet/exhaust vent; or low prove switch…DS1 ON / DS2 ONCircuit board failure or control wired incorrectly DS1 Slow Flash / DS2 Fast FlashLow flame signal; measures below 0.23 microAmps DS1 Slow Flash / DS2 ONPrimary, secondary, backup secondary or rollout limit switch open; limits must…

View all 31 error codes

DS1 Slow Flash / DS2 Slow FlashPower on

Service modes (2)

ICM-2 blower motor checkout (24V source method)["Disconnect power to unit.","Disconnect plug J46 from P46 located on the blower control…
ICM-2 blower motor checkout (battery method)["Disconnect power to unit.","Disconnect plug J46 from P46 located on the blower control…

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