“Why is my shower cold?” and other Shower Troubleshooting Questions

When something goes wrong with your shower, one of the first places you might turn to is the internet. A lot of people who visit our website do so for the helpful Frequently Asked Questions we have listed on there. It’s the first port of call for anyone experiencing problems with their shower, and we’ve tried to cover most of the common problems that can occur with both mixer and electric showers.

Below we have listed some of the most frequent questions we get asked, but if yours isn’t listed here then take a look at our Shower FAQs for more shower troubleshooting questions. If you still can’t find the answer you need, our friendly technical team will be able to help.

1.) Why is my shower cold?

Electric Showers:

There are a number of possible causes to why your electric shower is running cold and has no hot water. Try the following steps to solve the problem:

  1. Check the power supply to the unit; make sure the isolator switch is turned on. Are there any tripped switches or blown fuses?
  2. Showerhead and hose: The shower will only function correctly with the hose and head provided. Replacement heads and hoses can be bought from our online parts store.
  3. Is there sufficient water pressure in your mains water? The minimum working pressure required for our electric showers is approximately 1 bar at 8 litres per minute. If your pressure is adequate, the small white plunger between the black heater unit and the electrical connectors will drop down.

Mixer Showers:

  1. Check to see there is a supply of hot water available at your other hot outlets.
  2. Check for air in the hot supply and for a possible kinked hose. Refer to your user instructions in the fluctuating temperature or reduced flow rate section.

2.) My electric shower is leaking from the bottom of the unit

If the leak occurs when the shower is turned on then this will be due to the Pressure Relief Device (PRD) activating.
To meet European Standards, your shower unit features an integral PRD which is designed to provide a degree of shower unit protection should an excessive build up of pressure occur within the shower. Build up of pressure would normally be due to a kinked or damaged hose or blocked shower head.

Please note that your shower will only function correctly with the hose and head provided. Failure to do so may result in the operation of the PRD.

If the PRD has activated then it will need to be replaced. Replacement PRDs can be purchased directly from us, please visit our online Shower Parts Store.

3.) My mixer shower has a dripping shower head

A dripping shower head could be caused by water retention. Shower heads and hoses retain a considerable volume of water once the shower is turned off and therefore water will expel from the shower head. To check for this and fix the dripping shower head:

For adjustable height shower heads – Disconnect the hose from the outlet end (opposite end of the head/hose) and examine to see if the water continuously drips directly from the outlet.

If the dripping stops there is no fault with the shower or the shower cartridge. Ensure that your shower head is free from scale build up and that your hose connections are tight as these can also exacerbate this problem.

If the dripping continues please call our customer services team.

For fixed head showers - Unscrew the shower head from the arm and examine to see if the water continues to flow or drip. If water continues dripping with the shower head removed, contact our Customer Services team for advice. Please note pre-1996 fixed heads (with grey rubber gaitor) do not have the facility to remove the head and check.

If the water stops dripping ensure that the shower head is free from scale build up.

Depending on the type of water system in your home you may need to take different action:

For unvented water systems – This system requires regular servicing in the form of recharging the air gap. Instructions will be on the side of the hot water cylinder. If the air gap has been depleted this can cause a drip from the shower head. For further advice on this, please contact your cylinder manufacturer. 

For combination or multipoint boilers - The pressure may be too high. Our shower cartridges are designed to control static pressure to up to approximately 7 – 10 bar depending on your model. Please note that pressures can increase at night by an additional 30%. If pressures do approach the maximum limit then a ‘Pressure Reducing Valve’ must be fitted. This also applies for pressure surges.

If none of the above relate to your problem, please contact our customer services team.

4.) My electric shower has a low flow of water

There are a number of possible causes of no or low water flow in your electric shower. Follow these steps to try to find the cause of the problem:

  1. Check the power supply to unit is working.
  2. Ensure the water supply to the shower is turned on and the isolation valve is fully opened.
  3. Check to see if the water control is turned fully clockwise. Turn the flow control knob anticlockwise to increase water flow.
  4. Check that there isn’t an outlet blockage:

- Disconnect the head from the hose and run the shower. If water flows, then the head is blocked.
– If there is no flow of water, remove the hose from the outlet. If water flows then the hose is blocked.
– If there is still no flow once the hose has been removed then there is a possible restriction in the supply to the shower, or debris in the filter. For advice on debris in the filter, please refer to the shower installation and user guide or contact customer services. Additional shower installation guides can be downloaded from our website.

5.) How does an electric shower work?

An electric shower takes water directly from the mains cold water supply rather than using your household hot water system. When the shower is switched on, the water is heated by passing over a heating element, similar to that in a kettle. The temperature of the water can be adjusted by restricting and increasing the rate of water flow over the heating element. Restricting the water flow means the water is heated for longer, and so reaches a higher temperature.

Electric showers are ideal for busy and large households, or if there is a limited supply of hot water available. As the water is heated on demand, electric showers are ready to use at the touch of a button whenever required.

For any further questions, please see our electric shower FAQs and mixer shower FAQs.

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3 Comments

Filed under Electric Showers, Mixer Showers, Showers

3 responses to ““Why is my shower cold?” and other Shower Troubleshooting Questions

  1. This is a great tip particularly to those new to the blogosphere.
    Brief but very accurate information… Thanks
    for sharing this one. A must read article!

  2. Mr Cambray

    Why has my electric shower become really noisy

    • Hi there, do you have a Gainsborough Shower? It could be down to the engine, but we recommend that you call our Customer Service line on 01959 560760 and one of our team should be able to help you. We’re open Monday – Friday 08:30 – 17:00

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