Integrated ignition control board checks

What is going on

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.

Likely causes

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

Check in this order

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.

More furnace guides

• Airflow lower than demanded, furnace runs on low stage when high stage is expected
• Alternate combustion air opening (upflow or horizontal)
• Alternate vent/flue location (upflow or horizontal left)
• Annual inspection checklist
• Auxiliary limit control (location and purpose)
• Auxiliary limit switch open (blower compartment)