HVAC Cheat Sheethvaccheatsheet.com/charts/furnace-codes/goodman-gmvm96
Goodman / Amana GMVM96 / GCVM96 / AMVM96 / ACVM96 Furnace Codes
The * in the model number is the brand letter (G for Goodman, A for Amana). The later GMVM97 / GCVM97 has its own instructions; check them before using this chart.
| Code | Meaning | What to check |
|---|---|---|
| IF | Integrated control module has an internal fault. | Wiring and stable power to the furnace and control; replace the control if it persists. |
| E0 | Lockout due to an excessive number of ignition retries or flame recycles (3 total). | Gas supply, front cover pressure switch, igniter, orifices, flame sensor, flue and combustion air piping, inducer. How to fix → |
| E1 | Low stage pressure switch circuit is closed at the start of the heating cycle. | Sticking switch contacts or a short in the switch wiring. How to fix → |
| E2 | Low stage pressure switch circuit is not closed. Inducer runs continuously with no furnace operation. | Switch hose, blocked flue or inlet pipe, blocked drain, weak or stopped inducer, switch set point, wiring, blocked H fitting port. How to fix → |
| E3 | Primary limit open. Circulator blower runs continuously. | Filters, restrictive ductwork, circulator speed or failed blower motor, wiring. How to fix → |
| E4 | Flame sensed when it should not be present. Inducer and circulator run continuously. | Short to ground in the flame sense circuit, lingering burner flame, slow-closing gas valve. How to fix → |
| E5 | Open fuse. | Short in the low voltage wiring. Fix it, then replace the fuse with a 3-amp automotive type. How to fix → |
| E6 | Flame sense micro amp signal is low (furnace still operates). | Coated or mispositioned flame sensor; lazy flame from gas pressure or combustion air. How to fix → |
| E7 | Igniter fault or improper grounding. | Igniter, its wiring and the unit ground. How to fix → |
| E8 | High stage pressure switch circuit is closed at the start of the heating cycle. Furnace runs on low stage only. | Sticking switch contacts or a short in the switch wiring. How to fix → |
| E9 | High stage pressure switch circuit is not closed. Furnace runs on low stage only. | Switch hose, flue and inlet piping, drain, inducer, switch set point, wiring. How to fix → |
| EA | Polarity of 115 volt AC is reversed. | Line polarity and unit ground. |
| EC | Inducer motor overcurrent fault. | Reset power and confirm the inducer runs properly; replace the inducer or the control if needed. |
| Ed | Manual reset rollout switch is open. | Orifice plate out of position, blocked heat exchanger, burners out of alignment, defective heat exchanger. How to fix → |
| EF | Open auxiliary input. | Missing jumper between aux in and aux out, or an open float switch. How to fix → |
| d0 | Data not yet on network: the furnace has no shared data. | Populate the shared data set using the memory card for this model. |
| d4 | Invalid memory card data. | Confirm the shared data set is right for the model; reload with the correct memory card. |
| b0 | Circulator blower motor is not running when it should be running. | Motor power leads, the inductor (3/4 and 1 hp models), the motor. |
| b1 | Integrated control module has lost communications with the circulator blower motor. | Motor control leads, motor, then the control. |
| b2 | Circulator blower motor horsepower in the shared data set does not match the motor. | Motor horsepower for this model; reload shared data with the correct memory card. |
| b3 | Circulator blower motor is operating in a power, temperature, or speed limiting condition. | Blocked filters, restrictive or undersized ductwork, high ambient temperature. How to fix → |
| b4 | Circulator blower motor senses a loss of rotor control or high current. | Filters, grilles, registers, ducts and the furnace air inlet and outlet for blockage. How to fix → |
| b5 | Circulator blower motor fails to start 10 consecutive times. | Obstruction in the blower housing, seized bearings, failed motor. |
| b6 | Circulator blower motor shuts down for over or under voltage, or for over temperature on the power module. | Line voltage against the rating plate; high ambient temperature. |
| b7 | Circulator blower motor does not have enough information to operate properly, or fails to start 40 consecutive times. | Control populated with the correct shared data; locked rotor. |
| b9 | Airflow is lower than demanded. | Blocked filters, restrictive or undersized ductwork. How to fix → |
How to read the codes
- 'On' means normal operation. During a call the display shows status, not faults: H gas heat followed by percent of demand, HI high heat, C / C1 / C2 compressor cooling, P / P1 / P2 heat-pump heating, F continuous fan, dF defrost, Ft field test mode, A followed by airflow in CFM.
- No display: no power to the furnace or control.
- E codes are furnace faults, b codes are circulator blower faults, d codes are shared data (memory card) problems. A ComfortNet thermostat shows the same code with a short message.
Codes point to a circuit, not a part. Test before replacing anything, and never jumper a limit, rollout or pressure switch to keep a furnace running. Gas and line-voltage work is for trained technicians.
Source: Goodman Installation Instructions for *MVM96 and *CVM96 modulating gas furnaces, IO-406E (5/13), Troubleshooting Codes and Status Codes, pp. 52-57. The "meaning" column follows the manufacturer's wording; "what to check" is our field summary. Always go by the label on the furnace you're working on.
Related
- How to read furnace LED flash codes
- Furnace pressure switch troubleshooting
- Flame sensor microamps and cleaning
Other brands
- Lennox Merit ML180UH (80% single-stage)
- Carrier 58CVA / 58CVX (80% variable-speed two-stage)
- Rheem / Ruud R96V / 96MDV (96% two-stage communicating)
- Goodman / Amana GR9S80 / GD9S80 (80% single-stage)
- Trane / American Standard S9X1 / S9X2 / S9B1 (96% condensing)
- Lennox SL280UHV (80% two-stage variable speed)
- Goodman / Amana / Daikin GM9S96 / GC9S96 / GM9S92 (96% and 92% condensing, single-stage)
- Carrier 59TP6C two-stage condensing with InteliSense (Performance series)
- Lennox G60DF / G60DFV (older two-stage SureLight boards 18M3401, 46M9901, 18M9901, 49M5901)
- Lennox G60UH / G60UHV (SureLight boards 100869 and 100870)
- Rheem / Ruud R801T Ultra Low NOx (14 ng/J) single-stage upflow/horizontal, constant-torque blower
- Rheem / Ruud 802V / 80MDV (80% two-stage communicating, ECM blower; model numbers (-)802V and (-)(-)80MDV)
- Trane / American Standard S8B1 / S8X1 / S8X2 (80% single-stage and two-stage)
- Goodman / Amana GMVC96 / GCVC96 (96% two-stage variable-speed, *MVC96*BA and *CVC96*BA)
- Goodman / Amana GMVS96 / AMVS96 U-revision (96% variable-speed with analog pressure sensor, model numbers GMVS96*U and AMVS96*U)
- Rheem / Ruud R801T / 80MSX (80% single-stage, constant-torque blower; model numbers (-)801T and (-)(-)80MSX)
- Rheem / Ruud 802P / 80MDP (80% two-stage, model numbers (-)802P and (-)(-)80MDP)
- Rheem / Ruud 802T / 80MDT (80% two-stage with constant-torque blower, model numbers (-)802T and (-)(-)80MDT)
- Rheem / Ruud 801S / 801P / 80MSS / 80MSP (80% single-stage, model numbers (-)801S, (-)801P, (-)(-)80MSS and (-)(-)80MSP)
- Carrier 58STA / 58STX (80% single-stage, 4-way multipoise)
- Carrier 58SB0A / 58SB1A (single-stage, non-condensing)
One field tip a week
A short, practical HVAC tip in your inbox every week: diagnostics, charging, airflow and code changes. Free, unsubscribe anytime.
We'll only use your email for the newsletter. Privacy policy.
HVAC Cheat Sheet · Free PT charts, code lookups and calculators for techs at hvaccheatsheet.com