A

▶ If water is being drawn constantly, take action to stop this.
▶ Position the DHW temperature sensor correctly.
▶ Check that there is contact between the DHW cylinder temperature sensor and the cylinder.
▶ Vent the cylinder circuit.
▶ Set DHW heating to "priority".
▶ Check plate heat exchanger for calcification.
▶ Check sizing of DHW circulation line and heat loss.