Having trouble with the ETU2000 time guard?
If you pass the clock and turn it on manually, it gets hot, the heater is fine, the timer has failed.
It doesn't matter if the tank is insulated or not, because it has a thermostat that shuts off when the water temperature rises.
I think if you turn on the lights / controller power but nothing gets hot on the cylinder, then it's time to call the owner.
Feel like using an hour or two at random.
I suspect the cylinder elements need to be rearranged / replaced.
This is not your job as a tenant.