Triton Aspirante Topaz fault

[TonyS82]

Hi all, I have got a 10.5kw triton aspirante topaz thermostatic shower which i beleive is the same as a topaz T100SI. Recently I have been having the following intermittent fault and as its out of warranty I was hoping someone can help:
flow/pressure from head drops dramatically and at the same time the temperature will not go above 40-42 degrees. Turning the temperature dial makes no difference to temp or flow.
I have checked the filters and scale traps which are clear.
It sometimes goes back to normal whilst showering without touching anything, water pressure in the house is fine, and I noticed that when U switch from economy to full the solenoid is not as audible as when you go from full to economy or cold.
Any ideas what it could be? Possible solenoid???

 

[TonyS82]

Quick update,
I tested the resistance of the solenoid and it was 3.7ohms.
There is continuity through the thermal cut out
Thanks
Ant

 

[Agile]

Thats seems a very low resistance!

Are you sure that you are competent to use a multimeter if your life depended on it?

Tony

 

[TonyS82]

slip of the finger - 3.7kohms
I was typing on my phone at the time.

 

[Agile]

That sounds likely to be correct.

But the solenoid may be powering but failing to open.

I suppose you could monitor the voltage on the solenoid when the fault occurs?

I do that with small neons!

Tony

 

[TonyS82]

Sorry, i don't have anything like that lying around. Any other suggestions?

If the solenoid was not opening would water flow? As an estimaqte I would say the flow rate is about half of what it is when the shower functions correctly.