There are several common reasons for the excessive noise of the wall-hung boiler:

　　Reason 1: Gas pressure is unstable.

　　When the wall-hung boiler burns erratically, the flame will frequently shake, causing oscillation and amplification of the combustion pressure wave in the water tank, resulting in resonance noise.

　　Solution:

　　Contact the gas company to check the pressure. If there is no problem, please contact the manufacturer for after-sales service and ask the technician to repair it.

　　Reason 2: The installation of wall-hung boilers is not standardized.

　　If the hook for fixing the wall-hung boiler is not firm, the wall-hung boiler and the wall are not tightly attached, which will cause the fan inside the wall-hung boiler to resonate with the casing during operation, and the noise of the wall-hung boiler will become louder and louder.

　　Solution:

　　Reinforce the hook of the wall-hung boiler and correct the unreasonable installation.

　　Reason 3: The water pump has objects or failures.

　　The solid particle impurities in the heating system pipeline can penetrate into every water-passing area inside the pump, causing the pump to run more and more noisy. In addition, the breakage of the water pump impeller will also produce noise.

　　Solution:

　　This problem must be prevented before the wall-hung boiler is installed. A finer filter can be installed at the return port of the wall-hung boiler, and objects in the water pump should be cleaned regularly. If the impeller is broken, a new pump needs to be replaced.

　　Reason 4: The fan is dusty or faulty.

　　The wall-hung boiler has been used for a long time, and the dust and impurities on the fan blades affect the rotation balance of the fan and cause mechanical noise. The fan noise may also be caused by loose fixing screws or eccentricity of the fan shaft.

　　Solution:

　　For the cleaning of the fan blades, it is suggest to ask professional technicians to operate, and the users should not disassemble the wall-hung boiler without permission.

　　Reason 5: Dust deposits on the nozzle of the wall-hung boiler.

　　The gas flows out of the nozzle at a high speed. Because the nozzle accumulates dust, the outlet flow rate becomes faster, and there is a strong disturbance, momentum and mass exchange with the surrounding static air to form noise.

　　Solution:

　　Contact after-sales personnel to clean the nozzle and gas filter.

　　Reason 6: Poor water quality or gas accumulation.

　　Gas accumulation in the heating pipeline or poor water quality will cause water heating noise when heated to a higher temperature in the combustion heat exchanger.

　　Solution:

　　Clean the filter screen, replace the rotor and restrictor ring of the water valve (or replace the water valve directly); start and discharge the gas inside the water circuit several times.