Thursday, 15 April 2021

Redring Active 320 Troubleshooting: Testing Elements, TCO & Switches

⚠️ SAFETY FIRST: READ BEFORE STARTING

Working on electric showers is dangerous. You are dealing with a high-voltage appliance (240V) and water.

  • ISOLATE POWER: Always turn off the electricity at the main consumer unit (fuse box) and pull the isolation cord before removing the shower cover.

  • VERIFY DEAD: Use a voltage tester to ensure no power is reaching the unit.

  • LEGALS: In the UK, major electrical work in bathrooms is "Part P" regulated. If you are not a competent person or are unsure of these tests, stop and consult a Part P qualified electrician.

  • DISCLAIMER: You follow these guides at your own risk. This site and its authors are not liable for any injury, loss, or damage caused by your repairs.

Trouble shooting a Redring active 320 electric shower , testing element and tco thermal cut out as well as micro switches and solenoid valve.

Redring active 320 electric shower fault finding repair

Redring active 320 electric shower fault finding repair

Redring Active 320 Technical Specs:

  • Heating Elements: You should see approx. 11 ohms to 13 ohms on each element (depending on kW rating). Total resistance for a healthy 8.5kW tank is around 6.5 Ohms when tested in parallel.

  • Solenoid Coil: Redring solenoids usually read between 3.5-4k ohms . If it’s open circuit, the water won't flow.

  • Thermal Cut-Out (TCO): This is a non-resettable safety device. If there is no continuity 0 ohms, the part must be replaced. 

  • Warning: Never bypass a TCO to test a shower; it is a critical fire safety component.


See the entire testing process in the below video.







Buy electric shower parts on Ebay UK here


Need a Multimeter for testing try on Ebay UK here


Q: My Redring Active 320 has power but no hot water. What is the cause? 

A: The most common cause for 'no heat' in a Redring 320 is a failed Thermal Cut-Out (TCO) caused by scale buildup in the tank, or a burnt-out microswitch on the selector assembly. Use a multimeter to check continuity on the TCO first.

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