The descaling program now starts and the 'Descale and Status' lights flash. The descaling process takes around 20 minutes while the solution is pumped through the system at intervals, and then runs into the container until the water tank is almost empty. A little liquid is always left in the tank. Note: If the process takes less than 20 minutes, you may have run a cleaning cycle by mistake - the coffee machine will not be fully descaled and the red descale icon will remain illuminated. If this occurs go back to step 6.