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Rick Ridley
Rick Ridley, UK Heating Engineer
Category: UK Plumbing
Satisfied Customers: 1561
Experience:  30 Years on the tools, now retired, Ex CORGI
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Mira Sport Shower. Power to the internal terminal strip. The

Customer Question

Hi Andrew:
Mira Sport Shower. Power to the internal terminal strip. The thermal cut-out seems OK but the unit seems quite dead - no lights and no functions.
Submitted: 1 year ago.
Category: UK Plumbing
Expert:  Andrew Smith replied 1 year ago.
Hi my name is ***** ***** lets see if we can get you sorted in the shortest possible time.
Are you able to check continuity through the heater with the power off, it should be a complete circuit
Customer: replied 1 year ago.
Done that... the heater coils (both) look good. It is the 10.3kw variant. The unit appears dead - no lights on the pcb lighting up. Just removing the plastic cover to see what is underneath. The printed circuit board does not show any signs off overheating.
Expert:  Andrew Smith replied 1 year ago.

But you have power to the element?

Does the N on the element go straight back to the block?

Expert:  Andrew Smith replied 1 year ago.

This one?

http://www.showerdoc.com/mira-sport-post-2011-shower-spares

Customer: replied 1 year ago.
The neutral does go straight back to the block. the 2 power feeds to the heater elements (1 red wire, 1 brown) run back to the relays. There is a copper bar connecting the cut out to the relay board, but the relays do not switch on so there is no actual power going to the elements.
Expert:  Andrew Smith replied 1 year ago.

It sounds like this one then;

http://www.showerdoc.com/mira-sport-10-8kw-post-1998-shower-spares

The PCB pulls in the relays when you turn the power on.

Customer: replied 1 year ago.
That is the one (second one). Sorry it took me a couple on minutes - I needed to check. The relay does now switch on when the power is applied. I have checked the diodes on the board - all look ok. When the live arrives on the board (from the input) it goes straight through a series capacitor. Does that regularly fail?
Customer: replied 1 year ago.
sorry - type - it should read that the power does NOT switch on the power. this of course means there is a fault somewhere ...
Expert:  Andrew Smith replied 1 year ago.

Are you able to trace the power?

But even if you found the faulty component you will have to change the PCB to solve this.

The link I snet you is a very good site with decent prices

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