Nespresso Essenza C91 User Manual (English)

Questions and Answers:

J
james56Aug 18, 2025
Why is my Nespresso Essenza C91 not working?
- T
  Tyler CainAug 18, 2025
  If your Nespresso Coffee Maker isn't working, several factors could be the cause. First, check if the mains cable, On/Off button, and coffee button are all functional. Then, check if the pump is working by pressing the coffee button. Also, the pump's thermal fuse (128°C) or the thermoblock’s thermal fuse (167°C) might be defective, requiring you to replace the pump or the thermal fuse (and possibly the thermoblock). Finally, ensure the electrical wires are functional, and if not, replace the electronic mainboard.
S
Shane HillAug 20, 2025
Why is the coffee button blinking on my Nespresso Essenza C91 Coffee Maker?
- J
  Johnny BrownAug 20, 2025
  If the backlighted coffee button on your Nespresso Coffee Maker blinks at irregular intervals, check if the thermoblock heating element is functional.
B
Benjamin FlemingAug 23, 2025
What to do if water tank is leaking of Nespresso Essenza C91?
- K
  Karen WardAug 23, 2025
  If the water tank of your Nespresso Coffee Maker is leaking, replace the water tank.
B
Brittany RayAug 26, 2025
How to fix Nespresso Essenza C91 when no coffee comes out?
- H
  haleyhernandezAug 26, 2025
  If no coffee is coming out of your Nespresso Coffee Maker, there are a few potential reasons. First, ensure the water system is filled. If it is, the pyramid plate might be clogged, requiring you to replace the TCBU. Another possibility is that the machine is blocked by scale, in which case you should descale the machine.
J
Jesse RollinsAug 28, 2025
How to fix leakage at extraction system of Nespresso Essenza C91 Coffee Maker?
- C
  Courtney SnyderAug 28, 2025
  If there is leakage at the extraction system of your Nespresso Coffee Maker, replace the TCBU.
D
Daniel RiceAug 30, 2025
How to fix leakage at tubes connection of Nespresso Coffee Maker?
- D
  dshieldsAug 30, 2025
  If there's a leakage at the tubes connection of your Nespresso Coffee Maker, replace the defective tube and seal.
C
Cassandra LittleSep 1, 2025
What to do if the flow rate is out of range on Nespresso Coffee Maker?
- S
  Scott BrownSep 2, 2025
  If the flow rate of your Nespresso Coffee Maker is out of range, it might be because the machine is scaled. Descale the machine to resolve this issue.
Y
yfosterSep 4, 2025
What to do if temperature is too high on Nespresso Coffee Maker?
- C
  Connor MillerSep 4, 2025
  If the temperature of your Nespresso Coffee Maker is too high (more than 89°C), change the NTC.
P
Patricia GonzalezSep 7, 2025
What to do if it is hard to close closing handle of Nespresso Essenza C91?
- M
  Matthew LopezSep 7, 2025
  If it is hard or impossible to close the closing handle on your Nespresso Coffee Maker, screw on the closing handle screws at the defined torque or replace the CBU.
I
Ian BrownSep 9, 2025
What to do if capsule is not correctly ejected from Nespresso Essenza C91?
- B
  Brian DawsonSep 9, 2025
  If the capsule is not correctly ejected from your Nespresso Coffee Maker, replace the TCBU.

Nespresso Essenza C91 Specifications

General

Brand	Nespresso
Model	Essenza C91
Type	Espresso Machine
Pressure	19 bar
Automatic Shut Off	Yes
Power	1260 W
Material	Plastic
Weight	2.3 kg
Used Capsules	Nespresso capsules
Color	Black

Summary

Preface

General Manual Details

General information about the service manual and its purpose.

Nespresso Technical Website

Information about the Nespresso technical website for updates and modifications.

Manual Version Updates

Information on how to check for the latest version of the service manual.

General Safety Notes

Coffee Machine Safety Precautions

Important safety precautions for operating and repairing the coffee machine.

Main Components

Coffee Machine Component Overview

General overview of the coffee machine's main parts with numbered labels.

Rating Plate Information

Details and examples of rating plates found on the coffee machine.

Serial Number Breakdown

Explanation of how the machine's serial number is structured.

Water Circuit Diagram

Diagram and description of the water flow path within the coffee machine.

Coffee Machine Technical Specifications

Specifications and technical details of the coffee machine models.

Operation

Initial Machine Preparation

Steps for preparing the coffee machine before first use or operation.

Priming the Water System

Procedure to prime the water system if it is empty.

How to Make Coffee

Step-by-step guide on how to make coffee using the machine.

Emptying Water System for Storage

Instructions for emptying residual water for storage or transport.

Understanding Machine Status Lights

Explanation of coffee button and LED signals indicating machine status.

Troubleshooting

Machine Receipt Inspection and Fault Finding

Procedure to identify and locate faults when receiving the machine.

Repair

Repair Safety Warnings

Critical safety warnings before attempting any repair procedures.

General Coffee Machine Disassembly

Initial steps and tools required for disassembling the coffee machine.

NTC Sensor Replacement Guide

Step-by-step instructions for replacing the NTC temperature sensor.

Thermoblock Replacement Procedure

Detailed procedure for replacing the thermoblock unit.

Water Pump Replacement Steps

Instructions for removing and replacing the water pump.

Replacing Control Board and Buttons

Guide for replacing the main electronic control board and button interface.

Compact Brewing Unit (TCBU) Replacement

Steps for replacing the compact brewing unit (TCBU).

European Wiring Diagram (230V/50Hz)

Electrical wiring diagram for the European model.

Function Tests

Flow Rate Measurement Procedure Part 1

First part of the procedure to measure water flow rate.

Flow Rate and Pressure Measurement Part 2

Second part of the procedure to measure water flow rate and pressure.

Leak and Pump Pressure Check Part 1

Initial steps for checking leaks and pump pressure.

Leak and Pump Pressure Check Part 2

Continuation of leak and pump pressure checks.

Coffee Temperature Measurement

Procedure to measure the temperature of the dispensed coffee.

Protective Earth Continuity Test Introduction

Introduction to protective earth continuity testing procedures.

Performing Protective Earth Continuity Test

Practical steps for performing the protective earth continuity test.

Protective Insulation Test Introduction

Introduction to protective insulation testing procedures.

Performing Protective Insulation Test

Practical steps for performing the protective insulation test.

Protective Insulation Test Troubleshooting

Final steps and troubleshooting for protective insulation testing.

Maintenance

Machine Descaling Procedure Part 1

First part of the descaling procedure for the coffee machine.

Machine Descaling Procedure Part 2 & Rinsing

Second part of the descaling procedure and rinsing steps.

Daily Cleaning and Care Instructions

Instructions for routine daily cleaning and maintenance.

Spare Parts

Coffee Machine Repair Accessories

List of accessories used for repair and testing.

C91 Model Spare Parts List

Exploded view and part numbers for C91 model components.

Notes

Service Notes Section

Blank section for user notes and observations.

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