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Lelit Bianca: Testing the Safety Switches

Does either boiler on your Bianca fail to heat? A tripped safety thermostat aka safety switch aka high-limit switch could be the culprit. Below are instructions for resetting the machine's safety switches and testing for continuity.

Tools needed:

- #2 Phillips screwdriver
- Small flathead screwdriver
- Multimeter or simple continuity tester

NOTE: The machine should be unplugged and cool to the touch before beginning.

1. Remove the top panel.

2. Start by identifying the two brew boiler safety switches.
Lelit_Bianca_brew_boiler_safety_switches_01

3. Carefully use a finger or small flathead screwdriver to gently press down on the rectangular button in the center of the safety switch, making sure it is fully depressed. Feeling a slight "click" when pressing this button indicates that the switch was tripped.
Lelit_Bianca_brew_boiler_safety_switches_04
Lelit_Bianca_brew_boiler_safety_switches_06

2. Now identify the two safety switches on top of the steam boiler.
Lelit_Bianca_high_limit_01

2. Carefully use a finger or small flathead screwdriver to gently press down on the rectangular button in the center of the safety switch, making sure it is fully depressed. Feeling a slight "click" when pressing this button indicates that the switch was tripped.
Lelit_Bianca_high_limit_02
Lelit_Bianca_high_limit_03

Testing the switches:

If the buttons don't appear to have tripped, but one of the boilers still fails to heat, test for continuity across the each of the four safety switches. Backprobe both of the terminals on each of the safety switches by inserting a probe from your multimeter or continuity tester into the back of the two spade connectors on each safety switch as shown. A lack of continuity, even when the center button is fully depressed, indicates a faulty safety switch; replace as necessary.
Lelit_Bianca_high_limit_05