What Causes Loud Ignition Noise in Wall-Mounted Boilers?
2 Answers
Here are the reasons for loud ignition noise in wall-mounted boilers: Excessive impurities in natural gas: Wall-mounted boilers primarily rely on natural gas for energy supply, so the quality of natural gas is closely related to the performance of the boiler. If the natural gas contains many impurities, it can easily cause explosive combustion, resulting in loud noises from the boiler. Aging components of the wall-mounted boiler: In addition to the quality of natural gas, the service life of the wall-mounted boiler is also a factor to consider. After prolonged use, the burner and proportional valve of the boiler may age to some extent, leading to incomplete combustion of gas. This can also cause explosive combustion of natural gas, resulting in loud noises from the boiler. Poor circulation in the boiler system pipes: If the circulation in the system pipes of the wall-mounted boiler is poor, the issue is relatively easy to resolve. It is usually caused by noise from the system air pump, and the solution is to open the system exhaust valve to release the air. Damaged fan in the wall-mounted boiler: If the boiler produces noise immediately upon startup, it is mostly due to the destruction of the fan's dynamic balance, caused by vibration. Replacing the fan is necessary to eliminate the noise.
The sound when my wall-mounted boiler ignites is as loud as thunder, really frightening. I think there are quite a few reasons, mainly depending on how it ignites. If the ignition area is dirty, covered with dust or grease, the ignition will make crackling noises. Also, if the gas pressure is off—either too high or unstable—the flame will roar as it surges. As for the fan component, if the blades are worn or not tightly installed, it will buzz noisily when spinning. I've experienced this situation before and immediately called a repair technician. He cleaned the electrodes thoroughly, and the noise reduced significantly. If left unattended, not only will it be too noisy to sleep, but it could also lead to gas leaks, which is extremely dangerous. I usually do simple regular checks myself to ensure good ventilation around the boiler, which helps stabilize the sound. In short, this issue shouldn’t be taken lightly—fixing it early is safer and avoids the hefty cost of replacing the entire unit.
