LUCCA A53 Mini: Steam Boiler Over-pressurizing

If you find your LUCCA A53 Mini's steam boiler over-pressurizing and releasing steam from the safety valve then this guide will help you solve the issue.

1. When does the safety valve release steam?

a. At 1.5 bar or above? The machine is over-pressurizing. Move on to step 2.

b. At less than 1.5 bar? The safety valve is releasing below its rated pressure. You may need a new safety valve.

2. Verify that the fill probe is working correctly:

1. Turn machine off, unplug it, and allow it to cool.

2. Drain the steam boiler.

3. Remove and clean the clean the fill probe.

4. Reinstall the fill probe.

5. Turn the machine back on and allow the temperature to stabilize.

6. If the machine continues to over-pressurize, move on to step 3.

3. Reduce the temperature of the steam boiler:

For A53 Mini models with 85-120 displays:

1. Turn machine off so that it goes into standby mode (just power light flashing).

2. Hold 2 Cup button until 100 + 105 become lit.

3. Tap the 1 Cup button so that 95 also becomes lit.

4. Tap the 2 Cup button to go back to standby mode.

5. Turn the machine back on and allow temperature to stabilize.

For A53 Mini models with 91-97 displays:

1. Turn machine off so that it goes into standby mode (just power light flashing).

2. Hold 1 Cup button until 94 + 95 become lit.

3. Tap the Hot Water button so that 93 also becomes lit.

4. Tap the 1 Cup button to go back to standby mode.

5. Turn the machine back on and allow temperature to stabilize.

If this process does not work the first time, try to lower the temperature one more time using the same process and lighting up one more light to the left. If the machine is still over-pressurizing, move on to step 4.

4. Clean the steam boiler temperature probe:

1. Turn machine off, unplug it, and allow it to cool.

2. Drain the steam boiler.

3. Remove and clean the clean the steam boiler temperature probe.

4. Reinstall the steam boiler temperature probe.

5. Turn the machine back on and allow the temperature to stabilize.

6. If the machine continues to over-pressurize, you may need to replace the temperature probe.

We have instructions you can find here for replacing the steam boiler temp probe: A53 Mini Steam Boiler Temperature Probe Replacement