Ariston WRC-NSF tank is not heating water properly

[bigp26]

All,

Many thanks for your help on all of this stuff. Very much appreciated!

I however now have another problem. My Ariston WRC-NSF tank is not heating water properly (the overflow leak issue was sorted out by Homeserve, and turned out to be the T&P valve).

When I switch the top immersion heater on, I get hot water as expected. When I however switch the bottom immersion heater on (off-peak, main usage heater), the water is only mildly warm.

As I still haven't moved in (but hopefully next weekend ), I'm not quite sure whether the bottom immersion heater was heating water to the correct temperature or not.

Having had a look online, I see that there is a reset buttom on each of the thermostats for the heaters, as well as a screw to adjust the temperature.

I'm thinking to have a go at adjusting the thermostat, but what is the best way to find out what temperature it is heating the water to?

Many thanks in advance!
P

 

[EFLImpudence]

I haven't read the previous posts.

When I switch the top immersion heater on, I get hot water as expected.

All well, then.

When I however switch the bottom immersion heater on (off-peak, main usage heater), the water is only mildly warm.

Do you mean during the off-peak period?
It should come on all night. It won't work during the day.

I see that there is a reset buttom on each of the thermostats for the heaters,

It will not be working at all if the overheat cutout has operated.

as well as a screw to adjust the temperature.

It could be set too low.

I'm thinking to have a go at adjusting the thermostat, but what is the best way to find out what temperature it is heating the water to?

It should be set at 60°C.
Thermometer?