The house water works does not draw water

A typical malfunction of the house water system is when the pump stops drawing water. However, this can have different causes. But before you try out the costly options, you should first exclude the simple ones. What to do if the house water does not draw water, we have put together for you.

Construction of a domestic water plant

A domestic water works pump the water either from a well or a water tank (for example, to catch rainwater). This is then based on the following structure of the domestic water plant (starting from the well or water reservoir):

  • Suction or delivery line, with or without foot valve, depending on the pump
  • possibly pre-filter and / or filter
  • pump
  • pressure vessel
  • Feed-in line to the various customers (faucet)

The functioning of the pump is crucial

First, it makes a difference whether it is a self-priming and self-venting pump or whether one or both functions are to be negated.

Self-sucking pump

If it is a self-priming pump that has already been in operation, it must be checked whether the delivery line is still sufficiently in the water. Even on leaks, the support line must be checked. If both can be excluded, the pump performance itself must be checked. But more on that later.

Self-venting pump

For a self-bleeding pump, the same options should be checked. Finally, the pump is checked here as well.

Not self-sucking pump

A non-self-priming pump must always have a water column from the beginning of the suction pipe to the impeller. If air is present, cavitation will occur on the impeller, which may damage the pump. The delivery line must be completely filled with water.

So that the water actually remains in the suction pipe when the pump is switched off, sits at the end of a check valve or foot valve. For very long suction lines even more check valves may be appropriate. These are to be checked. In addition, there is often a sieve at the foot valve. Again, this should be checked for blockages.

Not self-venting pump

A pump that can not vent independently has a corresponding bleed screw. About this, the pump can be vented. Follow the instructions of the pump manufacturer.

Check the pump

If nothing helped, you have to check the pump yourself. To do this, connect the pump to a very short suction tube, which you can place in a suitably large water tank. Also on the outlet side you should attach a short tube or a hose that leads into this container.

A broken water pump

Now you have to prepare the pump if it is one of the above mentioned pump types. Then turn on the pump and check if water is being pumped. If no water is being pumped, you can assume that the impeller is defective. Incidentally, you must check the delivery line for each type of pump for leaks.

Tips & Tricks

If the pump draws water, but the domestic water supply does not switch off, the causes are completely different. Follow the link and get instructions on how to do it.

Video Board: How to Diagnose Problems with Well Water Systems