Goodman Furnace: Integrated ignition control board checks

Integrated ignition control board checks on a Goodman furnace: The control is not field repairable and must be replaced as a whole. Ground and polarity must be correct. The trial for ignition is 4 seconds. The control shows diagnostic codes on a dual 7-segment LED. When powered and in standby it shows ON.

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

Applies to: Integrated ignition control board

Common causes of integrated ignition control board checks

• Furnace not earth grounded
• Reversed hot and neutral
• High resistance in neutral
• Loose 5-pin connector
• No call for high stage heat
• Blown fuse

How to fix integrated ignition control board checks: step by step

1. Confirm ground: with power off, resistance from neutral (white) to the burner nearest the flame sensor is under 2 ohms.
2. Check for 120V line 1 (hot) to line 2 (neutral) at the control. If absent, check the door switch and harness.
3. With W1 called, check for 24V from W1 to C. If absent, check the transformer, thermostat and wiring. If 24V at transformer but about 13V at R and C, check the fuse.
4. Check induced draft low stage: 120V between pin 3 and pin 4 of the 5-pin connector. Check high stage: 120V between pin 2 and pin 4.
5. During preheat, check 120V between pin 1 and pin 5. If absent, check the low and high stage pressure switches, or replace the control.
6. After ignitor warm-up, check 24V to the gas valve. It should be present for 7 seconds only if flame is proven.
7. After proof of flame, check the air circulation blower comes on after the heat-on delay.
8. For ECM motor faults, first test the motor with a Goodman UTT-01 UltraCheck-EZ tool. If the motor runs with the tool, the motor is good.

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