Water supply
Fill the water tank to maximum level, press start and check how long it takes for all the water to flow through. If the brewer spends more than 5 minutes 30 seconds letting through all the water, then there is no point in sending the brewer for testing.
Brewing temperature
A correct brewing temperature must be between 92 and 96 °C, and the temperature must not exceed 96 °C. Check with a temperature sensor in the filter holder that the temperature is within these limits.