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Upgrade nowDiagnosing Thermocouples & Thermistors
Read through the material below, then test your understanding.
Module Lessons
Electrical Principles & Diagnostics
Ohm's Law & Electrical Power
Protection Against Electric Shock
Electrical Statutory Regulations
BS 7671 & IET Guidance Documents
Reading Electrical Plans & Diagrams
Consumer Units & Protective Devices
Lighting & Power Circuits
Earthing, Bonding & ADS
Electrical Accessories
Current-Using Equipment & Specialist Controls
Effects of Electric Shock on the Body
Tool & Equipment Safety Classes
The Safe Isolation Procedure, Step-by-Step
Hand Tools for Electrical Work
Cable Types
BS 7671 Termination Requirements (Section 526)
Terminal & Connection Types
Cable Glands & Enclosure Entry
Terminating Flexes & Single-Core Cables
Terminating Flat Profile (Twin & Earth) Cable
Installing Main Protective Bonding
Fitting & Labelling BS 951 Bonding Clamps
Electrical Test Instruments
Central Heating Control Sequence of Operation
Diagnosing Boiler Thermostats & Fans
Diagnosing Air Pressure Switches
Diagnosing PCBs & Ignition Components
Diagnosing Thermocouples & Thermistors
Alternative & Emerging Heat Sources
Testing Immersion Heaters
Isolating & Correcting Appliance Faults
Lesson Overview
Learn the operating principles, diagnostic procedures, and testing tolerances for thermocouples and thermistors used in domestic gas appliances and boilers.
Learning Objectives
Understand the thermoelectric operation, pull-in times, drop-out times, and open-circuit testing of thermocouples.
Explain the operating principles of negative temperature coefficient (NTC) thermistors and how they communicate with boiler printed circuit boards (PCBs).
Perform dead resistance and voltage diagnostic tests to identify open-circuit, short-circuit, and out-of-calibration sensor faults.
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