Immersion Heater & Thermostat workings and diagnosis!!

[seco services]

so on a conitnuity test theirs nothing ?
on a ohms test it reads 0 ?
then change the complete unit & stat as they come with a stat

 

[liverpoolboy]

there was no voltage for some reason between T and N.. so i guess the heater element has packed up for some reason! why would this be? the thermostat would be the thing to go if anything i would have thought?!

i didn't do a resistance test, just a voltage test. what difference would a resistance test make? just to double check?

will have to change whole heater then i guess, which means draining down cylinder.

 

[seco services]

you'll need to do a resistance test to check if the element is knackered.
i've had more element fail rather than stats.

 

[liverpoolboy]

ok i will do.
still don't know what the difference is though ! i mean if there is nothing then it's dead, what's the point of doing a resistance check as well ... ?

 

[seco services]

voltage is different to resistance.
or continuity

 

[liverpoolboy]

ok so voltage is Ok to test for thermostat but for element (heater) resistance is needed ... 18 ohms is fine but less or more means its failed?

 

[seco services]

or a continuity test.

 

[liverpoolboy]

right - got my multimeter out here again. i have never used it for anything other than voltage testing! what's a continutiy test? what setting?

 

[seco services]

it makes an auible bleep when the pongs are touched together

 

[steved101]

a continutiy test is a test for current (ac or dc)!

 

[seco services]

a continuity test is to test for a circuit that a current will flow round

 

[steved101]

yep exactly-to test for a current. so no current, in your case between T and N terminals on the heater, then it's knackered!!!