Water cylinder stat tripping

[Johntheo5]

70 is 0 ohm or like mine attached, little resistance.
there should be a click when you turn it back down and/or m.meter open circuit, usually shown as a I, like below, infinite resistance.

 

[newbuilder22]

So what is your conclusions? Faulty?

 

[Johntheo5]

Yeah, looks that way, they aren't very expensive.

"25 is reading 122.1kohm" Is this a auto ranging M.meter?, for interest, if you just hold the two probes apart what does it read?

 

[newbuilder22]

Yeah, looks that way, they aren't very expensive.

"25 is reading 122.1kohm" Is this a auto ranging M.meter?, for interest, if you just hold the two probes apart what does it read?

Auto range was on and apart reads

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the immersed is on just now and at 54c it is doing a lot of clicking.

 

[Johntheo5]

That sounds like the stat making and breaking, just renew it.

 

[ree]

OP,
I didn't say call anyone on any particular day or time.
DIY forums are indeed to help DIY'ers with DIY issues but there is a cut-off point where a job is no longer a DIY possibility but an issue that for technical & H&S reasons needs a professional.
I could give you say five possibilities for investigation, & detailed instructions for trouble shooting.
But I wont because like CH boiler issues, which I could but I dont advise on either.
IMO its a job too far for a DIY'er, & not being on site it would be irresponsible for me to advise.

 

[Murdochcat]

Turn the setting down on the immersion should stop the reset from popping

 

[Agile]

You should not heat the cylinder water above 65 C as that is unnecessary and risks scalding. For most people 55 C to 60 C is adequate.

The safety cut out should operate at 85 C which gives a fair degree of separation.

But the actual thermostat operation temperatures are not very accurate and can drift over time.

 

[newbuilder22]

Heating 65 and below means no hot water for multiple showers. Whilst the ideal would be a bigger tank, this is not affordable at the moment.

 

[Agile]

Is that because you are not reheating the tank during showering times?

A slightly shorter shower time solves many problems.

Or replacement shower heads giving a lower flow rate!

 

[newbuilder22]

Yes, tank is heated in off peak.

 

[Johntheo5]

I have solar thermal and allow it to heat the vented cylinder to 85C before cut out, I have a TMV on the cylinder outlet set to 60C.
Heating the cylinder to even 75C instead of 65C (plus installing a TMV) will give a extra 18% @ 40c from mains at say 10C.

 

[newbuilder22]

I have solar thermal and allow it to heat the vented cylinder to 85C before cut out, I have a TMV on the cylinder outlet set to 60C.
Heating the cylinder to even 75C instead of 65C (plus installing a TMV) will give an extra 18% @ 40c from mains at say 10C.

That’s a good idea, so mix cold in with hot out via TMV?

 

[Johntheo5]

Yes, but have a look at the temperature rating of the temperature&pressure relif vave settings on the cylinder first.

 

[newbuilder22]

Yes, but have a look at the temperature rating of the temperature&pressure relif vave settings on the cylinder first.

90degrees and 3bar