and the heater does
not work.
The heating LED is on,
but the water
temperature does not
rise.
1. The connection to the
heating pipe is not correct.
2. Heater failure.
1. Check that the pipe is not
damaged, and that it is
properly connected.
2. Replace the heater.
The power LED is on,
but the water
temperature does not
change.
Thermostat failure
Replace the thermostat
The thermostat
works, but the LED is
not on.
LED failure
Replace the LED