Monday, February 1 2021

You have installed a shower pump and your water pressure is dramatically improved, but what can you do to ensure that you get the best results from your shower pump for years to come? Our Training Manager, Ken Vance, explains the steps you can take to maintain your shower pump installation.

Maintenance of Positive Head Pumps –

Positive head pumps are activated by a flow switch which needs to see a minimum water flow rate of 1 litre in 30 seconds per side of the pump to turn on. Water must be able to flow through the pump and out of an open outlet, such as a shower head, to lift the small sensor in the pump which will then activate the pump, essentially a float.

Over time the activation of the pump can become delayed or can stop altogether, this can be seen by a reduction in shower performance. Many aspects of the installation can cause these issues, but a couple of key checks can be carried out periodically or when you witness any of these issues:

  1. Check the inlet filters on the pump. The filters on the inlet of the pump can become blocked by debris which will reduce the water flow rate, potentially below the minimum flow rate of the pump, stopping it from activating. You will find one inlet filter on a single-ended pump and two on a twin-ended pump, the filters will be located between the inlet hose connection(s) and the pump. FIND OUT HOW TO CHECK THE FILTERS ON YOUR PUMP.
  2. Check the shower head and hoses. Shower heads and hoses can become blocked, especially in hard water areas. The shower head can get clogged up with mould or soap scum, it could also get scaled up, restricting the water flow, potentially by enough to prevent the pump from seeing the minimum flow rate. The lining of the shower hose, if fitted, can also become twisted inside the metal hose, which will also prevent the water from flowing freely through the system and through the pump. If you notice a reduction in pressure or activation issues:

Maintenance of Negative (Universal) Head Pumps –

Negative head pumps work differently to positive head pumps. Where positive head pumps are activated by a flow of water, negative head pumps are activated by detecting a pressure drop when an outlet, such as a shower or tap, is opened.  This means that negative head pumps will still activate when the flow is restricted, by blocked filters or shower heads for example.

If a negative head pump stops working or activation becomes delayed, there are a couple of key checks which can be carried out:

  1. Check for blocked filters and shower heads/hoses. Although a negative head pump will still work when water flow rate is restricted, blocked filters and shower heads and hoses can still cause low pressure and should therefore still be checked as above.
  2. Check the LED lights. Some pumps feature LED lights which indicate why a pump has stopped working, including our ESP pumps, and universal Right Pumps:

ESPs –

The image to the right shows the interface on these pumps and outlines what each of the LED lights indicates.When the pump is running normally, then none of the red warning lights will be lit and a green LED should be lit next to a letter N.

AMBER LED illuminated next to a P this means the pump has reverted into positive head operation, often caused by an interruption to the power supply, such as a power cut. This will only occur in ESP pumps manufactured before 2014. If the amber LED is lit, the pump will need to be reset back to negative head mode by following the steps below –

  1. Switch the pump off at the electrical supply for three seconds.
  2. Switch the pump back on again and wait for a green LED next to N to light up (if you wait too long, the light will go back to amber).
  3. As soon as this green light comes on, turn the electric back off for three seconds and back on
  4. The pump should then show a green light which goes off and comes back on again (it should not then go back to amber or you may need to repeat the procedure).
  5. Check that when an outlet is opened, the pump activates.

RED LED illuminated next to 1, 2 or 3 this occurs when the pump recognises one of the following system faults - excess temperature, dripping outlet (hunting), or dry running. If any of these lights are illuminated you should contact Salamander Pumps on 0191 516 2002.

Universal Right Pumps -

The image to the right shows the interface on our universal Right Pumps, this interface was removed from pumps manufactured from 2020 onwards. When the pump is running normally, no LEDs will be lit. When the pump recognises a system fault the LED indicator lights will illuminate. Pumps with the fault identification LEDs can sense excessive supply water temperature, dry running, and chronic aeration or water starvation.

Hunting Protection

Dry Run Production

Excessive Temperature

Negative (universal) head pumps can sometimes activate on their own when there are no outlets in use:

  1. Leaks in the system (such as a dripping tap or shower). As the pump works on a pressure drop leaks in the system will cause the pressure in the system to drop, eventually this will be enough to activate the pump. This is called ‘hunting’ and could happen as often as every few minutes or as infrequently as once or twice a night. FIND OUT HOW TO CHECK IF A LEAK IN THE SYSTEM IS CAUSING YOUR PUMP TO TURN ON.

Other checks

There are a few other measures that can be carried out to ensure the longevity of your pump:

  1. Ensure hoses are not bent. The anti-vibration couplers on the pumps are to be installed as straight as possible. Bending the hoses more than 30-35o can result in the hose restricting internally, which will cause water starvation. Water starvation will cause the pump to make unnecessary noise.
  2. Minimise air in the pump.  Air can seriously damage a pump, which is why we have specific requirements for pump installations. Fitting a flange is a key way to ensure air is kept to a minimum and is a requirement for some installations:


If you have any questions give our technical team a call on 0191 516 2002, who will be happy to help.

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