You've installed a booster pump that doesn't automatically turn off, even though all supply points are closed. What can you do to resolve this issue?
To understand this problem, we'd like to explain how a booster pump operates. On this basis, it will be easier to understand where this problem comes from and how to solve it.
Booster pump operation
One of the features of a booster pump is that it automatically switches on when multiple supply points are open (e.g. faucets, washbasins, toilets, washing machines, sprinklers, etc.). The booster pump also switches itself off when all supply points are closed .
The automatic operation of the pump is controlled by the pressure switch. Depending on the type of booster pump you have, this is either a pressure switch, Presscontrol, BRIO or an 'active' system. These systems only measure the pressure on the pipes between which the pump is placed and act accordingly.
When one or multiple supply points are opened, the pressure in the pipe decreases, after which the cut-in pressure in the pump is reached. The pump then starts pumping to build up pressure again, right until it reaches its cut-out pressure . The cut-out pressure is reached if the pump has the ability to build up maximum pressure in the pipe again. This is fastest if all supply points are closed (or, if there is no water supply).
But what should you do if the booster pump continues to operate, even though all supply points are closed?
Causes and solutions
1. Air is leaking into the pump
Because air is leaking into the pump, the pump is unable to completely build up pressure and can't reach the cut-out pressure.
Consequence: The booster pump continues to run.
Solution: Check all hoses / pipes for holes and seal them. If there are no holes, check the couplings. This applies to both the suction and press side. Apply PTFE tape to all couplings to ensure maximum air tightness.
2. No check valve or foot valve attached to suction side
Because there is no check valve or foot valve, the water in the booster flows back to the source, causing the pump to detect a decrease in water supply.
Consequence: The booster pump notices the pressure in the pipe decrease and turns on to compensate and increase the pressure.
Solution: Attach a check valve or foot valve to the suction side of the pump. A check valve/foot valve ensures water can only flow in one direction: towards the pump. As a result, the water cannot flow back to the source.
Please note: All suction hoses in our assortment are equipped with a foot valve. If you have purchased a suction hose from our assortment, this shouldn't be the cause of your problem.
3. Dirt between a valve
Dirt between a valve may allow water to pass through.
Consequence: Pressure decreases and the booster pump reacts by turning on.
Solution: Clean all valves and make sure they are fully air tight. This applies to the following valves:
- Check valve
- Foot valve
- Both valves of a Presscontrol and BRIO
4. Drip leakage
A booster pump is excellent at supplying all kinds of household appliances (e.g. toilets, washbasins, washing machines) with water. However, there may be cases in which drip leakage arises (especially with toilets). This means that water escapes a pipe drip by drip, for example in the toilet sink. Such a leak may seem 'invisible', but it definitely isn't for the pump.
Consequence: Because water escapes the pipe, the pump detects a decrease in water supply and therefore decrease in pressure. The cut-in pressure is reached, the pump turns on and switches off once the cut-off pressure is reached. The period between switching on or off may last several (dozen) minutes.
Solution: Resolve the drip leakage in the appliance in question by using a stronger float switch or valve, for example.