Could a failing Hot Surface Igniter cause the RUUD U96V to have symptom: Wont Start?

The igniter is a silicon nitride resistive element that must reach temperatures exceeding 2000°F to ignite the air-gas mixture. Over time, the element develops microscopic fractures due to extreme thermal expansion and contraction cycles, eventually leading to an open circuit. Without the heat from the igniter, the flame rectification circuit never detects a pilot, and the Integrated Furnace Control (IFC) terminates the startup sequence for safety.

Could a failing Dual Pressure Switch cause the RUUD U96V to have symptom: Wont Start?

In condensing furnaces like the U96V, the pressure switch verifies that the combustion air inducer is creating sufficient negative pressure to exhaust flue gases. These switches can fail due to internal diaphragm rupture or moisture accumulation from the condensation process common in 90%+ AFUE units. If the switch fails to close, the furnace logic will not allow the gas valve or igniter to energize.

Could a failing Integrated Furnace Control Board cause the RUUD U96V to have symptom: Wont Start?

The control board serves as the central logic processor for the furnace, managing the timing of the inducer, igniter, and blower motor. Failure of the onboard relays or logic gates can prevent the board from sending line voltage to the ignition components or properly interpreting safety switch signals. This is often caused by voltage spikes or thermal stress on the PCB solder joints.

What is the most likely root cause for a RUUD U96V with symptom: Wont Start?

The igniter is a silicon nitride resistive element that must reach temperatures exceeding 2000°F to ignite the air-gas mixture. Over time, the element develops microscopic fractures due to extreme thermal expansion and contraction cycles, eventually leading to an open circuit. Without the heat from the igniter, the flame rectification circuit never detects a pilot, and the Integrated Furnace Control (IFC) terminates the startup sequence for safety.

RUUD U96V Wont Start

CONF	DIAGNOSIS	ACTION
86% CONF	Hot Surface Igniter The igniter is a silicon nitride resistive element that must reach temperatures exceeding 2000°F to ignite the air-gas mixture. Over time, the element develops microscopic fractures due to extreme thermal expansion and contraction cycles, eventually leading to an open circuit. Without the heat from the igniter, the flame rectification circuit never detects a pilot, and the Integrated Furnace Control (IFC) terminates the startup sequence for safety. SKU: 62-22868-93	VIEW ON AMAZON #CommissionsEarned
8% CONF	Dual Pressure Switch In condensing furnaces like the U96V, the pressure switch verifies that the combustion air inducer is creating sufficient negative pressure to exhaust flue gases. These switches can fail due to internal diaphragm rupture or moisture accumulation from the condensation process common in 90%+ AFUE units. If the switch fails to close, the furnace logic will not allow the gas valve or igniter to energize.	VIEW ON AMAZON #CommissionsEarned
6% CONF	Integrated Furnace Control Board The control board serves as the central logic processor for the furnace, managing the timing of the inducer, igniter, and blower motor. Failure of the onboard relays or logic gates can prevent the board from sending line voltage to the ignition components or properly interpreting safety switch signals. This is often caused by voltage spikes or thermal stress on the PCB solder joints. SKU: 62-105217-01	VIEW ON AMAZON #CommissionsEarned

DIY Repair Guide

Watch exactly how to replace the Hot Surface Igniter.

// 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.

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RUUD U96V Wont Start

DIY Repair Guide