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What is likely to happen if the high limit control fails?

  1. The system will continue to operate normally

  2. The temperature may exceed safe levels

  3. The burner will shut off completely

  4. No effect will occur on system performance

The correct answer is: The temperature may exceed safe levels

If the high limit control fails, it can lead to a significant safety risk by allowing the temperature to rise beyond safe levels. The high limit control is designed to monitor the temperature within the heating system, shutting off the burner if the temperature surpasses a preset limit. This safety feature is crucial because excessively high temperatures can cause overheating, leading to potential damage to the equipment or even hazardous situations such as fires or explosions. In this scenario, failing high limit control means there won't be an effective mechanism to prevent the temperature from rising unchecked. Therefore, the system could experience temperatures that exceed safe operational limits, which poses a serious threat to safety and system integrity. Maintaining functionality while also ensuring safety is vital in gas fitting practices, making understanding the role of high limit controls important for practitioners.