HD7857/20 / HD7857/21
10-24
• Sensor & LED test
To validate the assembly and electrical correctness of an appliance, especially during testing and debugging phase, a sensor
and LED test is very useful. Please keep in mind that it is not an automated test and only intended as indication.
Test-step 0: Entry to test mode
1. Connect mains;
2. After 0.5 second and before 1.5 second operate Button 2, On/Off button and Button 5.
3. Release all switches.
4. All LEDs will be ON for 1.0 seconds and after that switch to OFF again.
Test-step 1: Button identi cation
1. Manually operate a button.
The related LED - refer to the table below - will be ON.
2. Release the button.
The related LED - refer to the table below - will be OFF.
Sensor LED LED on LED off
Decal button Decal LED Button pressed Button released
Button 1 1-cup LED Button pressed Button released
Button 2 1-cup LED Button pressed Button released
Button 3 1-cup LED Button pressed Button released
On/Off button On/Off LED Button pressed Button released
Button 4 2-cup LED Button pressed Button released
Button 5 2-cup LED Button pressed Button released
Button 6 2-cup LED Button pressed Button released
Test-step 2: Entry sensor mode
1. Operate Button 2, On/Off button and Button 5.
2. Release all switches
3. All LEDs will be ON for 1.0 seconds and after that switch to OFF again.
Test-step 3: Sensor identi cation
1. Manually operate a sensor.
The related indicator - refer to the table below - will be activated.
2. Release the sensor.
The related indicator - refer to the table below - will be deactivated.
Sensor LED LED on LED off
NTC Boiler On/Off LED NTC error NTC OK
NTC Thermo block Decal LED NTC error NTC OK
Water level sensor 1-cup LED Water present Water low or no water present
Brew head sensor 2-cup LED Brew head closed Brew head open
Test-step 4: End test
1. Disconnect mains end test program
• Boiler reset
Boiler reset-step 0: Entry to boiler reset mode
1. Connect mains.
2. After 0.5 second and before 1.5 second operate Button 3 and Button 4.
3. Release all switches
The On/Off LED will blink fast for 0.5 second.
REPAIR INSTRUCTION
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