Electric shower stopped working, faults and problems

Electric showers are a convenient and efficient way to heat water on demand, providing instant hot showers without the need for a separate water heater or boiler. 

However, like any appliance, they can encounter problems that may cause them to stop working. Understanding the common issues or complex problems that can arise with electric showers can help in diagnosing and fixing the problems. 

Lets look at some of the reasons an electric shower might fail.

1) Electric showers can fail due to electrical issues and these could be any of the following:

• Tripped Circuit Breaker
• Blow Fuse
• Loose or Damaged Wiring
• Faulty Power Start Button
• Shower Pull Cord or Isolator

1.1) Tripped Circuit Breaker

One of the most common reasons for an electric shower to stop working is a tripped circuit breaker. Showers draw a significant amount of electrical power, and any surge or overload can cause the circuit breaker to trip. 

Where there is an apparent lack of power, this could result from a burnt-out circuit breaker or fuse box connections failing under the stress of providing enough power to the shower. In such cases, the circuit breaker would need to be replaced and the connections re-made with good copper cable.

Check the consumer unit or electrical panel and reset any tripped breakers. If the breaker trips repeatedly, it may indicate more serious electrical faults such as cable damage, circuit breaker failure or other issue that requires a professional electrician to attend. 

1.2) Blown Fuse

A blown fuse in the shower's electrical system, power supply line or at the fuse box can also prevent it from working. This can occur due to power surges, faulty wiring, or a component failure within the shower.

Inspect the fuse and replace it if necessary. In older fuse boxes there may be fuse wire protecting the cable and this will need replacing with the correct type. In slightly newer fuse boxes, a cartridge fuse may be present and this must be checked for electrical continuity. 

If the fuse blows again don’t replace the fuse more than once as it is important to identify the underlying cause of the blown fuse to prevent future occurrences, wiring damage or damage to the electrical system. 

1.3) Loose or Damaged Wiring

Over time, wiring connections can become loose or damaged. The expansion and contraction of metals can mean that wires work loose in the terminals. This can disrupt the electrical supply to the shower, causing it to stop working.

Check the wiring connections in the shower unit and the main electrical supply. Ensure all connections are secure and have an electrician replace any damaged wires. This task should be performed by a qualified electrician who has the correct test equipment and knowledge to work safely on the system.

1.4) Faulty Power Switch

The power switch on the shower unit can wear out or become faulty, preventing the shower from turning on. Some manufacturers showers are more prone to this issue than others, mechanical switches seem to be more reliable in my experience.
Test the power switch for continuity using a multi meter set to low ohm range. If the switch is faulty, it will need to be replaced.

2) Water issues could cause a electric shower to cease to function as without correct water flow the shower will shut down. Such issues could be:

• Low Water Pressure
• Blocked Shower head
• Frozen Pipes

2.1) Low Water Pressure

Electric showers require a minimum water pressure to operate correctly. Low water pressure can be due to issues with the main water supply, clogged pipes, or a faulty pressure regulator.

Check the water pressure at other outlets in the home to determine if it’s a localized problem. Clean any clogged pipes or replace the pressure regulator if necessary. Check if anyone else in the home is using the water supply at the same time as this could affect the supply pressure to the shower.

If the shower or incoming pipe has any inlet filters, check to see if they are blocked. 

2.2) Blocked Showerhead

Over time, mineral deposits such as limescale build-up and debris can accumulate in electric shower heads, reducing water flow and pressure. The shower hose can also be affected with debris or scale build up.

Remove the showerhead and hose and clean them thoroughly. Soaking it in a solution of vinegar and water can help dissolve mineral deposits. This can be an easy fix and should not require a new shower head or hose.

2.3) Frozen Pipes

In colder climates, water pipes can freeze, restricting the flow of water to the shower. This is a common issue during the winter months.

Insulate exposed pipes to prevent freezing. If pipes are already frozen, gently thaw them using a hairdryer or heat tape, taking care not to overheat and damage the pipes.

3) There are a number of components that could fail inside the electric shower that would appear to cause complete failure such as:

• Thermostat Failure
• Heating Element Failure
• Flow Valve Problems
• Micro Switch Failure

3.1) Thermostat Issues

The thermostat in an electric shower regulates the water temperature. If the thermal switch cuts out or thermostat fails, it can result in water that is too hot, too cold, or no hot water at all.

Test the thermostat using a multi meter to ensure it is functioning correctly. If it is faulty, it will need to be replaced.

3.2) Heating Element Failure

The heating element in an electric shower heats up the water as it flows through the unit. A faulty electric element can result in no hot water

Test the heating element for continuity. The manufacturer may specify what the resistance value should be across the element. If the element is defective, it must be replaced. This is a common issue in older units.

3.3) Flow Valve Problems

The flow valve controls the amount of water entering the heating chamber. If the valve is stuck or faulty, it can prevent the shower from working properly. Some showers have a pressure relief device or valve (PRV) for when the water pressure is too high. 

Inspect the flow valve for any signs of damage or obstruction. Clean or replace the valve as necessary. Check the PRV for signs of recent operation.

3.4) Micro Switch Failure

Electric showers have micro switches that activate the heating element when water flows through the unit. A faulty micro switch can prevent the shower from heating the water.

Test the micro switches and replace any that are not functioning correctly.

4) There are of course a number of user errors that can cause issues with the operation of the electric shower or even cause it to fail such as:

4.1) Incorrect Settings

Users may inadvertently set the shower to a mode that prevents it from working correctly, such as a low-temperature setting or an eco-mode that limits water flow.

Check the shower’s settings and adjust them to ensure the correct operation.

4.2) Inadequate Maintenance

Regular maintenance is essential for the proper functioning of an electric shower. Neglecting to clean the showerhead, descale the unit, or inspect for wear and tear can lead to issues.

Perform regular maintenance as recommended by the manufacturer. This includes cleaning the showerhead, checking for leaks, and inspecting electrical components.

4.3) Overuse or Overheating

Continuous use of the shower for extended periods can cause overheating, leading to a shutdown as a safety precaution. 
The best option is to allow the shower to cool down between uses. If overheating continues to be an issue, it may indicate a problem with the thermal cut-out switch or other components.

5) Safety Considerations

When dealing with electric showers, safety is paramount. Here are some additional safety tips to keep in mind:

• Turn Off Power Before Inspection

  Always turn off the power supply at the circuit breaker before inspecting or performing any maintenance on the shower. Check the installation manuals for instructions.

• Use a Qualified Electrician

  Electrical work can be dangerous. If you are not confident in your ability to diagnose or repair electrical issues, hire a qualified electrician to perform the work.

• Check for Water Leaks

  Water and electricity are a hazardous combination. Ensure there are no water leaks around the shower unit or electrical connections. Water supplies and electrical wiring should not mix.

• Regular Inspections

  Conduct regular inspections of the shower unit, electrical connections, and water supply lines to identify and carry out necessary repairs before they become serious problems. Check the fitting instructions for any details of recommended maintenance.

6) Summary

Electric showers are a modern convenience that can sometimes encounter issues causing them to stop working. 

The common problems include electrical issues such as tripped circuit breakers, blown fuses, and faulty wiring; water supply problems like low pressure, blocked showerheads, and frozen pipes; component failures involving the thermostat, heating element, flow valve, and micro switches; build-up of limescale and user errors such as incorrect settings and inadequate maintenance. 

Addressing these issues involves a combination of regular maintenance, proper troubleshooting, and sometimes professional help. By understanding these common problems and their solutions, users can ensure their electric showers continue to provide reliable and efficient hot water.