The main faults of the water heater are as follows: no water outlet, large noise and vibration, insufficient water flow, water leakage, motor heating, and other reasons. Here are the key analysis of these problems.

1. Cause analysis of water heater without water output:

 -The inlet and outlet valves of the hot water pump are not opened, the inlet and outlet pipelines are blocked, and the abortion impeller is blocked. The solution is to remove the obstruction.

 -The motor is running in the wrong direction, and the motor rotates slowly due to the lack of phase. Adjust the direction of the motor and strengthen the motor wiring.

 -The suction pipe of the hot water circulation pump is leaking. Tighten each sealing surface to remove air

 -The pump is not filled with liquid and there is air in the pump cavity. Open the upper cover of the pump or open the exhaust valve to exhaust the air.

 -The inlet and outlet water supply is insufficient, the suction stroke is too high, and the bottom valve is leaking. Shutdown inspection and adjustment (this phenomenon is prone to occur when the water pipe is connected to the grid and the use with suction lift).

 -The pipeline resistance is too large, and the centrifugal pump is improperly selected. Reduce pipe bends and reselect pump

2. Analysis of the causes of noise and vibration of the water heater:

 -The pipeline support is unstable. Stabilize the pipeline.

 -Liquid mixed with gas. Increase suction pressure to exhaust.

 -Cavitation occurs. Reduce the vacuum.

 -The bearing is damaged. Replace the bearing.　　

 -The motor is running with overload and heating. Adjust the flow rate and close the outlet valve.

3. Cause analysis of insufficient flow of water heater:

 -The inlet and outlet valves of the hot water circulation pump are not opened, the inlet and outlet pipelines are blocked, and the abortion impeller is blocked. The solution is to remove the obstruction.

 -The impeller of the pipeline and the hot water circulation pump flow path is partially blocked, the scale deposits, and the valve opening is insufficient. Remove the obstruction and readjust the valve opening.

 -The centrifugal pump voltage is low. Stabilization

 -Worn impeller. Replace the impeller.

 -Use in excess of the rated flow. Adjust the flow and close the outlet valve

 -The suction lift of the centrifugal pump is too high. Reduce the suction lift.

 -The pump bearings are worn. Replace the bearing.

4. Analysis of water leakage reasons of water heater

 -The mechanical seal of the hot water circulation pump is worn out. replace.

 -The pump body has sand holes or cracks. Welding repair or replacement.

 -The sealing surface is not flat. Trimming.

 -The mounting bolts are loose. Fasten.

5. Analysis of heating causes of water heater motor

 -The flow rate of the hot water circulation pump is too large, and it is running with overload. Close the outlet valve.

 -Wipe. Check for exclusion.

 -The bearing of the hot water circulating pump motor is damaged. Replace the bearing.

 -Insufficient voltage. Voltage stabilization.

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