Model reference

Lennox G60UH-24A-070

Furnace

1 document32 error codes2 service modes

Available documentation

Service Manual

G60UH(X) Service Literature62 pg
Covers this model

MyPros+ Max

Diagnose your Lennox G60UH-24A-070.

Step-by-step diagnostics from the service manual
Test values, resistance specs, and wiring references
Verified part numbers when replacement is needed

Start diagnosing

$29/month · Cancel anytime · Or $9.95 3-day pass

M+

M+ Max·Lennox Furnace

1+2 on my Lennox G60UH-24A-070

M+

Low flame current during run mode.

From Service Manual 642748, p.40:

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 (32)

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 Fast Flash / DS2 Fast Flash (simultaneous)Normal operation DS1 Fast Flash / DS2 Slow FlashMain power polarity reversed.DS1 OFF / DS2 Fast FlashHigh pressure switch open, or blocked inlet/exhaust vent, or high pressure…DS1 OFF / DS2 ONMain power polarity reversed; switch line and neutral.DS1 OFF / DS2 Slow FlashLow pressure switch open, or blocked inlet/exhaust vent, or low pressure switch…DS1 ON / DS2 ONCircuit board failure or control wired incorrectly; check 24V and 115V to board.DS1 Slow Flash / DS2 Fast FlashLow flame signal 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…DS1 Slow Flash / DS2 Slow Flash (simultaneous)Power on

View all 32 error codes

DS1/DS2 Alternating Fast FlashDuring ignitor warm-up only DS1/DS2 Alternating Slow FlashWatchguard

Service modes (2)

Error Code Clearing (Board 100869)["Short R (pin 2) to (pin 1) on control board.","Within 1/2 second, STATUS LED will stay lit…
Error Code Review (Board 100869)["Short R (pin 2) to (pin 1) on control board.","Within 1/2 second, STATUS LED will stay lit…

Full entry steps, exit procedures, and test sequences are available in Max.

Related Lennox furnace models

78,000+ service manuals · 160,000+ error codes · 55+ brands

$29/month · Cancel anytime · Or $9.95 3-day pass