Steam/Hot Water Maintenance
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Lelit Bianca: Testing the High-limit Switches

Does the steam boiler on your Bianca fail to heat? A tripped safety thermostat aka high-limit switch could be the culprit. Below are instructions for resetting the high-limit switch and testing for continuity. (Difficulty ☕)

Tools needed:

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

1. Remove the top panel.

2. Identify the two high-limit 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 high-limit 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

3. If the buttons don't appear to have tripped, but the steam boiler still fails to heat, test for continuity across the high-limit switches. Touch one probe from your multimeter or continuity tester to each of the two spade connectors on both high limit switches. A lack of continuity, even when the center button is fully depressed, indicates a faulty high-limit switch; replace as necessary.
Lelit_Bianca_high_limit_04
Lelit_Bianca_high_limit_05