Immersion heater stat testing

[Custom45]

Home now, so have checked the stat with a multimeter. I'm getting ok readings on it. 00.8 on the stat tails.

The stat was set to 70°c. I measured the temperature coming out the bath tap, was getting 86°c on it. I've turned the stat down to 50°c and will drain the tank after a shower & washing up etc. Will turn it back on to heat at 50°c then test water temp again.

 

[terryplumb]

Change the thermostat

 

[Custom45]

Change the thermostat

Yep, doing it.

Reheated water after turning it down to 50, it's scorching hot again, definitely stat is knackered.

 

[333rocky333]

if you take the stat out and just put it in a bowl of warm water as you turn the dial you will hear it click at the temp of the water its in

 

[Custom45]

Thanks rocky, will give that a go.

 

[HERTS P&D]

Just replace it:

Side:
https://www.screwfix.com/p/dual-safety-thermostat-7/21275

Top:
https://www.screwfix.com/p/dual-safety-thermostat-18/89445

Andy

 

[Custom45]

Yep, will be doing it when I'm home this evening. Got a spare in the garage. Cheers.

 

[Gasguru]

Even on brand new thermostats the temperature setting scale is for decoration only...it's common to find they are 10 or 15 degrees out.

 

[Custom45]

Well Well this is fun... pulled the stat out and water came ****ing out after it. The tube the stat sits in has obviously corroded and let in water. Going to have to change the whole thing.