Lochinvar heater shows E007; unit may run briefly then shut down.

Safety: Disconnect power before working on sensors or wiring.

Steps:

• 1. Access outlet sensor: Locate the outlet temperature sensor on the hot water outlet pipe.
• 2. Check connections: Ensure the sensor plug is fully seated on the sensor and at the control board. Look for corrosion or moisture at the connector.
• 3. Measure resistance: With the sensor unplugged, measure resistance and compare to Lochinvar's specified values for the current water temperature. Replace the sensor if readings are out of range.
• 4. Inspect harness: Follow the harness from the sensor to the control, checking for pinched or damaged sections. Replace the harness if insulation is compromised.
• 5. Reset and test: Restore power, clear the error, and verify stable operation.