Applicable Systems
Lochinvar Knight Boiler (SMART SYSTEM Control)
Symptoms
The boiler reports a temperature sensor fault. The supply or return temperature sensor is malfunctioning.
Possible Causes
- Sensor element drifted from calibration
- Sensor wiring damaged or connector loose
- Sensor element open or shorted
Troubleshooting Steps
- Step 1: Test the sensor resistance against the temperature chart
Reading matches the expected value - Step 2: Check the sensor wiring and connector
Wiring is intact and connector is secure - Step 3: Replace the faulty sensor
New sensor reads correctly
How to Reset
To reset: Replace the faulty sensor, then clear the fault.
Source: Lochinvar Boiler Manual, Lochinvar Corporation
Category: Boiler