HVAC●FAULTS
GOODMAN DIAGNOSTIC REFERENCE 56 VERIFIED CODES

Goodman furnace error codes

Find your light pattern below. Every entry is verified against official service literature — no guesswork, no generic tables.

Single red LED — flash codes

Series: GMS8 · GDS8 · GHS8 · GMSS96 · GMH8 · GDH8

PatternMeaningSeverity
No LED Signal Professional repair
Ignition Lockout — Flame Not Established After 3 Tries Try DIY first, then call a pro
Pressure Switch Stuck Closed Professional repair
Pressure Switch Stuck Open Try DIY first, then call a pro
Open Primary Limit Switch Try DIY first, then call a pro
Flame Sensed With No Call for Heat Safety issue — act now
Open Rollout Limit Switch Professional repair
Low Flame Sense Signal DIY-friendly fix
Igniter Circuit Fault or Poor Ground Try DIY first, then call a pro
Reversed 115V Polarity or Poor Ground Professional repair

Dual 7-segment display (two-stage variable-speed)

Series: GMVC96 · GCVC96

PatternMeaningSeverity
E0 Ignition Lockout (E0) Try DIY first, then call a pro
E1 Low-Stage Pressure Switch Stuck Closed (E1) Professional repair
E2 Low-Stage Pressure Switch Stuck Open (E2) Try DIY first, then call a pro
E3 Open Primary, Auxiliary, or Rollout Limit (E3) Professional repair
E4 Flame Sensed With No Call for Heat (E4) Safety issue — act now
E5 Open Fuse (E5) Professional repair
E6 Low Flame Sense Signal (E6) DIY-friendly fix
E7 Igniter Fault or No Ground (E7) Try DIY first, then call a pro
E8 High-Stage Pressure Switch Stuck Closed (E8) Professional repair
E9 High-Stage Pressure Switch Stuck Open (E9) Professional repair
EA Reversed Line Polarity (EA) Professional repair
d0 No Shared Data (d0) Professional repair
d4 Invalid Memory Card Data (d4) Professional repair
b0 ECM Blower Motor Not Running (b0) Professional repair
b1 ECM Motor Communications Lost (b1) Professional repair
b2 Motor Horsepower Mismatch (b2) Professional repair
b3 ECM Motor in a Limiting Condition (b3) Try DIY first, then call a pro
b4 Motor Trips (b4) Professional repair
ON Display Reads ON — Normal Info — not a fault

Modulating furnace (GMVM97) — dual 7-segment display

Series: GMVM97

PatternMeaningSeverity
E0 Lockout — Excessive Retries or Recycles (E0) Try DIY first, then call a pro
E1 Low-Stage Pressure Switch Stuck Closed (E1) Professional repair
E2 Low-Stage Pressure Switch Stuck Open (E2) Professional repair
E3 Open High-Limit Switch (E3) Try DIY first, then call a pro
E4 Flame Detected With No Call (E4) Safety issue — act now
E5 Open Fuse (E5) Professional repair
E6 Low Flame Signal (E6) DIY-friendly fix
E7 Igniter Fault or Improper Grounding (E7) Try DIY first, then call a pro
E8 High-Stage Pressure Switch Stuck Closed (E8) Professional repair
E9 High-Stage Pressure Switch Stuck Open (E9) Professional repair
EA Reversed 115VAC Polarity (EA) Professional repair
EC Inducer Motor Overcurrent (EC) Professional repair
EE Improper Wiring to the Furnace (EE) Professional repair
EF Open Auxiliary Input (EF) Professional repair
b0 Blower Motor Not Running (b0) Professional repair
b1 Blower Communication Error (b1) Professional repair
b2 Blower Horsepower Mismatch (b2) Professional repair
b3 Blower in Power / Temperature / Speed Limit (b3) DIY-friendly fix
b4 Blower Current Trip or Lost Rotor (b4) Professional repair
b5 Blower Locked Rotor (b5) Professional repair
b6 Blower Voltage or Temperature Trip (b6) Professional repair
b7 Incomplete Parameters Sent to Motor (b7) Professional repair
b9 Low Indoor Airflow (b9) DIY-friendly fix
d0 Data Not Yet on Network (d0) Professional repair
d1 Configuration: Single-Stage Cooling + Dehumidification (d1) Info — not a fault
d2 Configuration: Two-Stage Cooling + Dehumidification (d2) Info — not a fault
d4 Invalid Memory Card Data (d4) Professional repair

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