Model reference

Lennox C33-30A-2F

Name: Lennox C33-30A-2F
Brand: Lennox

Furnace

1 document30 error codes

Available documentation

Service Manual

G60UHV(X) Series Service Literature70 pg
Covers this model

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Low flame current during run mode.

From Service Manual 344901, p.33:

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 (30)

CodeMeaning

1+2Low flame current during run mode.1+3Flame sensed out of sequence 2+3Low pressure switch failed open.2+4Low pressure switch failed closed.2+5High pressure switch failed open.2+6High pressure switch failed closed.2+7Low pressure switch opened during ignition trial or heating demand.3+1Limit switch open.4+1Watchguard 4+2Watchguard 4+3Watchguard 4+5Watchguard 4+6Watchguard 4+7Ignitor circuit fault 4+8Low line voltage.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).5+4Reversed line voltage polarity (control will restart if the error recovers).5+6Low secondary (24VAC) voltage.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 Slow FlashDuring ignitor warm-up period only DS1 Off / DS2 Fast FlashHigh prove switch open, blocked inlet/exhaust vent, or high prove switch closed…DS1 Off / DS2 OnLow flame signal; measures below 0.23 microAmps DS1 Off / DS2 Slow FlashLow prove switch open, blocked inlet/exhaust vent, or low prove switch closed…DS1 On / DS2 OffMain power polarity reversed; switch line and neutral.DS1 On / DS2 OnCircuit board failure or control wired incorrectly; check 24 and 115 volts to…DS1 Slow Flash / DS2 OffFlame sensed without gas valve energized.DS1 Slow Flash / DS2 OnPrimary, secondary or rollout limit switch open; limits must close within 3…

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