What can cause a gas burning unit to be turned off by safety control while the pilot is burning EXCEPT?

In the context of safety controls for a gas-burning unit, the primary purpose is to monitor specific operational parameters and ensure safe functioning. A bad connection at the power unit does not typically trigger safety controls while a pilot light is still burning. This is because safety controls are designed to respond to hazardous conditions, such as overheat conditions, low water temperature, and blocked flues, which can pose immediate risks to the system and its operators.

For example, an overheat condition can indicate that the unit is operating beyond safe temperature limits, potentially leading to system failure or even a fire hazard. Similarly, low water temperature can signify that the system is not producing adequate heat, which might lead to scaling or corrosion that could become a safety issue. A blocked flue could result in dangerous gas build-up, leading to carbon monoxide poisoning or other hazards.

A bad connection, while it may affect system performance, is less likely to result in immediate danger compared to these other conditions, which are critical determinants for shutting down the unit for safety reasons.