GOODMAN GMVC96 Furnace Blowing Cold Air
| CONF | DIAGNOSIS | ACTION |
|---|---|---|
|
91%
CONF
|
Flame Sensor
The flame sensor utilizes flame rectification to confirm combustion; over time, silica buildup and oxidation create an insulating layer on the sensor rod. If the control board does not receive the required DC microamp signal within a few seconds of gas valve actuation, it shuts down the burners and runs the blower to purge the heat exchanger, resulting in cold air. Cleaning or replacing this non-moving component restores the electrical path required for the control board to maintain the flame.
SKU: 0130F00010
|
|
|
5%
CONF
|
Hot Surface Ignitor
The ignitor is a high-resistance heating element that reaches temperatures exceeding 2500°F to ignite the gas-air mixture. Due to the high thermal stress of repeated expansion and contraction cycles, the silicon nitride material can develop microscopic cracks that lead to an open circuit. Without a glowing ignitor, the gas will not combust, leading the system to fail three ignition attempts and enter a 'cold' lockout mode.
SKU: 0130F00008
|
|
|
4%
CONF
|
Primary High Limit Switch
This bimetallic safety switch is designed to open and cut the gas valve circuit if internal heat exchanger temperatures exceed a safe threshold. If the switch fails electrically or is fatigued from frequent tripping (often caused by airflow restrictions like dirty filters), it will stay in the 'open' position. The furnace control board is programmed to run the blower motor indefinitely when this switch is open to prevent structural damage to the furnace, causing the unit to blow unheated air.
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DIY Repair Guide
Watch exactly how to replace the Flame Sensor.
// NOTICE:
This report is generated by an Agentic AI Engineer utilizing probabilistic modeling.
PartSniper is an automated parts recommender service. AI-generated results may not be correct. This data is not a substitute for professional engineering advice or manual inspection. Always verify part compatibility and disconnect power before any repair. PartSniper is not liable for inaccuracies, injury, or damage.