Test more than one function before assuming the Rivelia has a heating fault. Make an espresso, then try the Hot Water function. If neither becomes properly hot, the problem is more likely to involve the machine's heating system rather than an individual drink setting. If coffee is hot but a milk drink seems cool, concentrate on the milk system instead.

The Rivelia allows the coffee temperature to be adjusted through its settings. If the machine is working normally but drinks aren't hot enough, check that the temperature hasn't been set too low. Remember that this setting primarily affects the coffee water temperature — it won't compensate for a cold cup or a milk system problem.

A cold, thick ceramic cup can remove a surprising amount of heat from a freshly prepared coffee. Warm the cup using the machine's Hot Water function, discard the water and immediately prepare another drink. This is particularly useful when diagnosing complaints that the first coffee of the day isn't hot enough.

Limescale inside the Rivelia's water circuit can interfere with water flow and heat transfer. If the machine is displaying a descaling request, complete the full guided Descale programme rather than repeatedly dismissing the message. Don't interrupt the programme once it has started.

If espresso and hot water are reaching normal temperatures but cappuccino or latte drinks aren't, don't immediately suspect the main heater. Make sure the LatteCrema Hot carafe is correctly assembled and clean, particularly the milk intake tube, connector and froth-adjustment components. Restricted milk delivery can noticeably change the finished drink temperature.

The Rivelia should heat automatically during its start-up sequence. If it remains stuck heating, repeatedly fails to become ready, produces consistently cold water, or displays an alarm even after restarting and descaling, there may be an internal heating-system fault. At this stage, components such as the heater, temperature sensing circuit, thermal protection or associated wiring require proper diagnosis rather than continued resetting.