Goodman Furnace: No heat – Goodman/Amana 9-speed ECM furnaces

No heat - Goodman/Amana 9-speed ECM furnaces on a Goodman furnace: Thermostat calls for heat but the furnace does not start, light or deliver heat. Step-by-step check of the heating sequence from the manufacturer flowchart.

Homeowner with a furnace problem? Call (647) 657-2977 or book a service call — licensed technicians across Vaughan and the GTA.

Applies to: Goodman/Amana/GMC gas furnaces, 9-speed ECM, 7-segment control. Two-stage 96%: AC9C96, AM9C96, GC9C96, GM9C96. Single stage 80%: VC9S80, VM9S80, AC9S80, AM9S80, GC9S80, GM9S80. Single stage 92/96%: VC9S96, VM9S96, AC9S96, AM9S96, AM9S92, GC9S96, GM9S96, GM9S92

Common causes of no heat - goodman/amana 9-speed ecm furnaces

• No power or blown board fuse
• Open thermostat circuit
• Inducer or pressure switch problem (vent, drain, hose)
• Igniter or control board output failure
• No gas, low gas pressure or failed gas valve
• Dirty flame sensor or poor ground
• Blower motor or harness failure

How to fix no heat - goodman/amana 9-speed ecm furnaces: step by step

1. Check the furnace power switch and breaker are on and the thermostat is set to heat above room temperature.
2. Measure 115 VAC between line H and N on the control board. None: check the breaker, service switch and blower door switch.
3. Check 115 VAC at the transformer primary and 24 VAC at the secondary. Primary OK but no secondary: check for a short, then replace the transformer.
4. 24 VAC at the transformer but not between R and C on the board: replace the board fuse (find the short first).
5. No 24 VAC between W (W1) and C with a heat call: the thermostat or its wiring is open.
6. Inducer not running: check 115 VAC at the inducer. No voltage = control board or inducer wiring; voltage but no run = inducer bad or off on its thermal protector (check for over-voltage).
7. Pressure switch not closing: measure the negative pressure at the switch. Enough vacuum = replace the switch; not enough = check venting, drainage, water in the inducer and a plugged switch port.
8. No 115 VAC to the igniter after pre-purge: replace the control board. Voltage but no glow: replace the igniter. Igniter glows only part of the warm-up: check for the pressure switch opening during warm-up.
9. Gas valve must open and hold proper manifold pressure for at least 4 seconds. If not: confirm house gas pressure, 24 VAC at the valve wires, and 24 VAC between HI/M and common; on 90% models check the front cover pressure switch in series with the valve, on 80% models check for an open auxiliary limit in series with the valve; then replace the valve.
10. Burners do not light or will not stay on: check burner dirt and alignment, orifice plate position, flooded or blocked heat exchanger, flame signal, ground wires, and that all pressure switches stay closed.
11. Blower does not start about 30 seconds after ignition: check 115 VAC between CIRC-H and neutral and at the motor L/N, then the speed tap signal between motor common and a T terminal; check the harness, then the motor.
12. Burners shut off before the thermostat is satisfied: read the fault code and compare the actual temperature rise with the rating plate.

If the unit shows an error code, look it up: Goodman Furnace codes

Models

Goodman/Amana GM9C96/AM9C96

AC9C96AM9C96AM9C960303ANGC9C96GM9C96GM9C960303AN

Goodman/Amana GM9S80/AM9S80

AC9S800403ANAC9S800603ANAC9S800804BNAC9S800805CNAC9S801005CNAM9S800403ANAM9S800603ANAM9S800603BNAM9S800604BNAM9S800803BNAM9S800804BNAM9S800804CNAM9S800805CNAM9S801005CNAM9S801205DNGC9S800403ANGC9S800603ANGC9S800804BNGC9S800805CNGC9S801005CNGM9S800403ANGM9S800603ANGM9S800603BNGM9S800604BNGM9S800803BNGM9S800804BNGM9S800804CNGM9S800805CNGM9S801005CNGM9S801205DN

Goodman/Amana GM9S96/AM9S96

AC9S960403BNAC9S960603BNAC9S960804CNAC9S961005CNAC9S961205CNAC9S961205DNAM9S920403ANAM9S920603BNAM9S920803BNAM9S920804CNAM9S920805CNAM9S921004CNAM9S921005CNAM9S921205DNAM9S960403ANAM9S960603BNAM9S960803BNAM9S960804CNAM9S960805CNAM9S961004CNAM9S961005CNAM9S961205DNGC9S960403BNGC9S960603BNGC9S960804CNGC9S961005CNGC9S961205CNGC9S961205DNGM9S920403ANGM9S920603BNGM9S920803BNGM9S920804CNGM9S920805CNGM9S921004CNGM9S921005CNGM9S921205DNGM9S960403ANGM9S960603BNGM9S960803BNGM9S960804CNGM9S960805CNGM9S961004CNGM9S961005CNGM9S961205DN