Furnace will not start; thermostat is calling for heat but there is no inducer fan, no ignition attempt, and the control board shows E1.

Safety first: Turn off power to the furnace at the service switch and the breaker. Shut off gas at the gas cock before removing panels.

Steps to check and correct:

• Remove the blower compartment door to access the integrated furnace control (IFC) on your Westinghouse unit.
• Locate the return air temperature sensor (often a small thermistor mounted in the return air plenum or near the blower housing) and trace its two-wire harness back to the control board.
• Inspect the sensor and wiring for cuts, burns, or pinched sections. Reseat the plug on both the sensor and the control board.
• With power still OFF, disconnect the sensor and measure its resistance with a multimeter. Compare to the temperature/resistance chart in the Westinghouse service manual (typically 10–20 kΩ at room temperature). If it reads open (OL) or 0 Ω, replace the sensor.
• If the sensor tests good, check continuity of the harness from the sensor plug to the board terminals. Repair or replace damaged wiring.
• If wiring and sensor are good but E1 persists after power reset, the IFC may have a failed sensor input circuit and should be replaced.

When to call a professional: If you are not comfortable using a multimeter or cannot access the sensor safely, contact a qualified HVAC technician.