Shower goes hot and cold without chnaging the temeperature setting

I have a Aquatronic 4 electric Shower. It goes from hot to cold and then very hot without touching the temperature setting. I have checked the thermal cut out and the outlet pipe and they seem to be working OK. Is there anything else I should check
Asked 8 years ago by Phil
The things to check first are:

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

2 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

The other possibility is a faulty flow/stabilizer valve not allowing the correct amount of water into the shower.


Also if it is a Triton have a look at the outlet TCO

The outlet Thermal Cut Out this is a black disk with two wires going to it and it is mounted on the out let pipe (The bit between the heating tank and the hose)


Examine the connections closely if you see any discoloration / signs of overheating then the TCO needs replaced.

Answered 8 years ago by Anonymous

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