mira sport electric shower problems

Mira Sport electric showers are popular for their reliability and convenience. However, users may occasionally face issues with temperature control and water pressure. This article discusses common problems encountered with Mira Sport showers and offers potential solutions to these issues.

Problem 1: Inconsistent Water Temperature

One frequent issue with Mira Sport showers is an erratic water temperature, where the shower suddenly produces either only very hot or only cold water.

Possible Causes and Solutions

  1. Thermal Cut-Out (TCO) Unit: The TCO, a black unit located on top of the heater tank, might be malfunctioning. Checking for continuity on both sides of the TCO is advisable. If there’s no continuity, replacing the TCO might resolve the issue.
  2. Faulty Heating Elements: Testing the resistance of the heating elements is crucial. Normal resistance readings are typically between 12 – 18 ohms each. If the readings are outside this range, replacing the elements may be necessary.
  3. Flow Valve Issues: A faulty flow valve could also cause temperature inconsistencies. If there is no change in flow when adjusting from fully cold to fully hot, the flow valve may need replacement.
  4. Microswitch Problems: The microswitch on the top of the flow valve may not be making proper contact. This switch should be checked, especially at medium settings, to ensure it is touching and functioning correctly.

Problem 2: Low Water Pressure

Another common issue is reduced water pressure, which might be accompanied by the low flow light not turning on.

Possible Causes and Solutions

  1. Clogged Filter: A clogged filter could be restricting water flow. Checking and cleaning the brass mesh filter in the main body of the unit, especially where the shower connects to the mains water supply, is recommended.
  2. Flow Valve Check: Verifying the function of the flow valve can help determine if it’s the cause of the pressure issues. If there is no alteration in flow from cold to hot, this might indicate a faulty valve.
  3. Power Supply and Connections: Ensuring that the power supply to the shower is stable and all connections are secure can also affect water pressure and should be checked.

General Maintenance and Precautions

  1. Safety First: Always disconnect power and turn off the water supply before opening the shower unit for any inspection or maintenance.
  2. Regular Checks: Routine checks of the TCO, heating elements, flow valve, and filters can prevent many common issues.
  3. Professional Help: If the problem persists or if there is uncertainty about DIY repairs, it’s advisable to seek assistance from a professional plumber or a Mira-authorized technician.


Addressing issues with Mira Sport electric showers often involves checking and potentially replacing components like the TCO, heating elements, flow valve, and filters. Understanding these common problems and their solutions can help users maintain their showers’ performance and longevity. Regular maintenance and timely intervention are key to avoiding long-term issues. For complex problems, seeking professional help is recommended for a safe and effective resolution.

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