Gas Fitter Practice Test 2025 - Free Gas Fitter Practice Questions and Study Guide

The low water cut-off is a critical safety control designed specifically to prevent boiler damage due to low water levels. If the condensate pump fails to return enough water to the boiler, the water level can drop to dangerously low levels, which poses a risk of overheating and possibly damaging the boiler or even causing a catastrophic failure.

When the low water cut-off detects that the water level has fallen below a safe threshold, it automatically shuts down the burner or the boiler itself to prevent any further operation while a hazardous condition exists. This action safeguards the integrity of the boiler system and protects against the risks associated with low water conditions.

In contrast, other controls such as the high and low pressure limit controls focus on regulating the pressure levels within the boiler system but do not directly address the issue of water levels. Similarly, flame safeguard controls ensure that the burner operates safely with the correct flame presence and does not directly impact water levels. Thus, the low water cut-off is the appropriate safety control in this scenario, addressing the potential hazard specifically associated with the failure of the condensate pump.