Temperature regulation on Triton shower

[Jupiter01]

I think this is one for the Electricians as oppose to the plumbers...
I have a Triton Excite electric shower and it's now starting to misbehave.

The temperature dial could be set to a "normal" temperature and it will remain like that for a few minutes and then suddenly get very hot or cold. There seems to be no rhyme or reason to it.

I would appreciate any suggestions that you may have for this.

Thanks in advance.

 

[Alec_t]

Did you read this bit of the installation manual ? :-
"c.The stabiliser valve minimises variations in shower temperature during mains water pressure changes. If changes in shower temperature are experienced during normal use, it will most likely be caused by the water pressure falling near to or below the minimum level. The drop in pressure may be due to water being drawn off at other points in the house whilst the shower is in use. If pressure drops appreciably below the minimum, the heating elements will automatically cut out. If ever the water becomes too hot and you cannot obtain cooler water, first check that the sprayplate in the showerhead has not become blocked."

 

[Jupiter01]

There was no water running elsewhere in the house at the time of the recent issue.

I will try to clean the shower head. Would it help to try with the shower head removed to see if I can replicate the issue?

 

[Alec_t]

Worth a try.

 

[CBW]

Would it help to try with the shower head removed to see if I can replicate the issue?

Yes, and also if possible try removing the hose at the shower outlet. Could be kinked or collapsed internally.

 

[Jupiter01]

I tested this with the hose removed at the outlet and still have the same issue. There were no other taps running at the time and I have also verified that the stopcock is fully open.
I'd appreciate any other suggestions that you may have.

Thanks again.

 

[CBW]

Failing that you’re looking at flow stabilising valve as suggested.

 

[Jupiter01]

Is it easier and perhaps more economical to replace the shower?
A new 9.5kw Triton shower costs £60. I will need to check but I believe I have a 6mm cable and 45amp breaker on this.

 

[BS3036]

Should just check that the water connection point is compatible if you want this to be a simple job. Possibly also the electrical connection point.

 

[Jupiter01]

I opened up the existing shower and noticed signs of burning.

Unfortunately, I didn’t check for loose terminals before unscrewing it. I then screwed the cables back into the terminal. I have done another test and it seems okay. The issue is intermittent so it may resurface when used in anger.

Is this a plausible cause?

Also, the shower is 9.5KW and when I tested continuity across these two terminal (circled in yellow), it reported continuity.

 

[securespark]

There were no other taps running at the time

Not even a DW or WM?

 

[Jupiter01]

Not even a DW or WM?

Yes, neither were running

 

[Jupiter01]

I was wondering if there was any further advice / suggestions following my post on Friday morning?
Thanks for your support

 

[CBW]

You tested for continuity across the thermal cut out (tco) which proves it’s ok. Burnt connections are never good, so this could have also been the reason for you having hot water then cold. Have you tested the voltage at the shower?

 

[Jupiter01]

You tested for continuity across the thermal cut out (tco) which proves it’s ok. Burnt connections are never good, so this could have also been the reason for you having hot water then cold. Have you tested the voltage at the shower?

Yes, 240v. I measured this using the voltage display screen on my Fluke 2 Pole Tester.