A: 

It may be your solenoid valve, you can check it if you have a multi meter, you should have a reading of at least k3.5 ohms, across the two terminals any less and you need a new valve. (Check the valve in the failed state.) (When it is not working!)

If there is power getting to the solenoid and it is not operating then there is a good chance that you have a faulty solenoid.

If you don’t have a multimeter we sell them with a guide on how to use them for checking and testing the various parts of your shower.

Apart from helping to fix your shower, they are really useful for checking you have a power supply to appliances, for checking fuses and letting you know much power you have left in batteries

(So you will know if they are good or not) and lots of other jobs, in short they are well worth a few pounds

http://www.showerdoc.com/installation/electrical-products/SKYTRO-600-005-Digital-Multi-Tester

Answered 75 days ago | The Doc

A: 

If when you switch off the shower at the main isolator and the shower keeps running then you have a faulty solenoid.

 

When you switch off the shower at the main isolator and the water stops running, then you have a faulty on/off switch or a faulty PCB or a micro switch that is sticking on.

Answered 131 days ago | The Doc

A: It is most likely to be the solenoid coil, if you click on the link below it will take you to a video clip showing how to check andvreplace, and order online.

http://www.showerdoc.com/shower-spares/triton/HYDR-27600-Universal-Solenoid-Coil-(No-Valve)

Alastair
Answered 59 days ago | Alastair

A: Would recommend the Triton T80z whichis designed for ease of retrofitting to almost any electric shower. It can be ordered online by clicking on the link below but check what power you Aquatronic is before ordering.

http://www.showerdoc.com/shower-spares/mira/MIRA-PARENT-103-Mira-Event-XS-Thermostatic

Alastair
Answered 57 days ago | Alastair

A: 

The things to check first are.

1 Is your shower connected to the water mains and you have a minimum pressure of 1bar

2 That the main valve coming into your house is fully open.

3 Then check that the valve on the line to the shower is fully open.

If these valves are not fully open then there may not be enough water
getting to your shower to cool it properly the overheat safety device will turn
the power off until it cools Then it all starts again

Make sure that the shower head is clean and clear, that the hose isn’t kinked (this can happen just behind the hand set where it is difficult to see) also check the inside of the hose although it can look OK on the outside it could have collapsed internally

Answered 32 days ago | The Doc

A: This is almost certainly a water flow problem.
Check that the hose is not kinked or obstructed internally and that the shower head is clear.
Check that mains stopcock and any valve in the shower supply are fully open.
Check inlet filter in the solenoid valve is not clogged.
If you have noticed any reduction in flow or pressure of supply at cold tap in kitchen then ask your supplier to check mains.
If all above are ok the it is probably te stabiliser valve which can be ordered online by clicking on the link below.

http://www.showerdoc.com/shower-spares/triton/TRITO-82600550-Stabiliser-valve-assembly-(7-5-8-5-9-5kw)
Answered 13 days ago | Alastair