System Details 41
4.7.2 High Temperature Limit Switch
Item Description
Function
1. Overheat prevention switch.
2. If the switch detects extremely high temperature, the boiler will automatically trip and shut down.
3. Excessive high water temperatures (> 105°C) in the heat exchanger will activate the high limit switch.
Fault Unable to detect high water temperature conditions if the switch malfunctions.
Symptoms Unable to shut down the boiler if the water temperature from the heat exchanger exceeds 105°C.
Error codes E016, E046
Diagnostics
1. Visual inspection: Check wire connections are secure and inspect for wire damage.
2. Resistance test: Confirm that the resistance is within the specification shown below.
Testing/inspection
information
Resistance range: < 1.0Ω
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