NTC temperature sensor functionality, 139 | Nespresso EF483/484

F U N C T I O N T E S T S

9.7NTC temperature sensor functionality

The resistance of the NTC temperature sensor must be within a defined range, other wise the temperature regulation will not work properly and the coffee machine will stay/ go into failure mode.

An easy way to check the functionality of the NTC temperature sensor is to measure the ohmic resistance at ambient temperature. With this measurement, most defect NTC temperature sensors can be detected.

Avoid contamination of sensor contact sur face during handling.

1)Unplug NTC temperature sensor from electronic control board.

2)Remove NTC temperature sensor from thermoblock (refer to page 104 and following).

3)Measure temperature of sensor body (do not touch either temperature or NTC sensor by hand).

4)Measure resistance of NTC tempera ture sensor by connecting a multime ter at the plug.

5)Compare measuring values with fol lowing diagram or table.

Citiz service manual

139

Image 139

Nespresso EF483/484, EF485/486, EF487/488 manual NTC temperature sensor functionality, 139

Contents

Service MA NUA L Citiz Coffee MA Chines Contents Repairs 130 Prefa CE Content Upda TESVersion To contact with both cir cuit conductors Genera L SA Fety Notes Model range Model OverviewWith core unit Drange With core unit Crange rangeCrange Core unit versionsDifferent components range Overview core unit, Drange MA in Components Interior view core unit, Drange Overview core unit, Crange Interior view core unit, Crange Overview model Citiz Overview model Citiz & milk Overview milk frother AERO3 Overview model Citiz & Co Fluid System Water circuit diagram of core unit all Citiz versions Water circuit of models Citiz/Citiz & milk Water circuit of model Citiz & Co Nespresso, EUversion Technica L DA TARating plates Examples of brand specific rating plates Koenig, CHversion DeLonghi, EUversion Magimix, EUversion Krups, EUversion Turmix, ATversion Rating plate details Decoding the alphanumeric serial number Rating plate of milk frother model Citiz & milkExample Technical data of coffee machines Summary of technical data Various data TemperaturesPump Capacities Technical data of milk frother model Citiz & milk Temperature Dimensions and weight model CitizPerformance data Dimensions and weight milk frother Dimensions and weight model Citiz & milk Dimensions and weight model Citiz & Co Status indication of coffee machine Opera TionGeneral information Status indication Button Status indication of milk frother AERO3 Machine status etc Operating button Light signal Machine modes Enter mode Actions Exit modeMachine modes of Citiz coffee machines Machine mode Enter mode Actions Exit mode Machine modeMachine modes of milk frother AERO3 Resetting the fill up level Program/reset fill up levelProgramming the fill up level Empty water system MA Intena NCE Daily maintenance and cleaningBefore first coffee or at the start of day After last coffee or at the end of day Milk frother of model Citiz & milk Descaling Descaling procedure for models Citiz and Citiz & milk Observe the safety instructions on the descaler package I N T E N a N C E Rinse thoroughly to remove any residue Descaling procedure for model Citiz & Co Do not open handles dur ing descaling process I N T E N a N C E I N T E N a N C E Troub L Eshooting Check Error symptomsCheck list for coffee machine all models Work Check Error symptoms Measure Further measures / repair Work Error symptoms Measure Repair workCheck list for milk frother Check Repa IRS Safety instructionsRepair and mounting tips Bottom of platform Residual water Wiring arrangementDesignation of spare parts Electrostatic discharge protection Tools and accessories General disassembly Platform disassembly model Citiz Bottom cover Assembly checkpoints Replacing water tank connector Replacing mains switch Assembly checkpoints Replacing power cord Wiring with twocore power cord Wiring with threecore power cord Removing core unit Use apair of flat pliers Assembly checkpoints Platform disassembly model Citiz & milk P a I R S P a I R S Assembly checkpoints Replacing water tank connector Assembly checkpoints Replacing milk frother connector Receptacles Replacing power cord Assembly checkpoints Removing core unit Tacle Assembly checkpoints Platform disassembly model Citiz & Co Core units are If necessary use a screwdriver to remove protective cover Assembly checkpoints Replacing water tank connector Replacing mains switch Assembly checkpoints Replacing power cord Assembly checkpoints Removing core units Assembly checkpoints Remove left side panel Disassembly of core unit, Crange P a I R S Remove blind Remove right side panel Remove front cover with outlet Remove cover Assembly checkpoints Replacing compact brewing unit Assembly checkpoints General Replacing pump Replacing pump assembly Seat for the fork wrench Replacing flow meter Assembly checkpoint101 Replacing automatic priming device APD 103 Replacing thermoblock with NTC sensor and fine wire fuses 105 Replacing NTC temperature sensorAssembly checkpoint NTC temperature sensor Replacing fine wire fuses Assembly checkpoints thermoblock Assembly checkpoints fine wire fuses 107 Replacing electronic control board with button prints P a I R S Remove outlet Disassembly of core unit, Drange109 Remove right side panel 111 Swing up and remove right side panel 113 Closing handle should be opened 115 Refer to page 114 for removing cover 117 Wiring diagrams model Citiz Wiring diagramsWiring diagram 220 V 240 V IEC model Citiz, EF 483/484 119 Wiring diagram 120 V UL USA/Canada model Citiz, EF 483/484 P a I R S 121 Wiring diagram 110 V IEC Taiwan model Citiz, EF 483/484 123 Wiring diagram 100 V IEC Japan model Citiz, EF 483/484 Wiring diagrams model Citiz & milk, EF 485/486 125 P a I R S 127 Wiring diagrams model Citiz & Co, EF 487/488 129 Required equipment Function TestsOverview 131 Citiz pressure gauge adapter Measure flow rate 133 Pressure and leakage checks Preparations 135 Test run Measure coffee temperature 137 Coffee temperature should be 86 C ± 3 C 187 F ± 5.4 F Prerequisite Measure hot milk temperatureMilk frother tests Measure milk froth ratio 139 NTC temperature sensor functionality NTC temperature NTC min. resistance NTC max. resistance NTC DiagramMeasurement table 141 Protective earth PE continuity testWhat coffee machine has to be tested and when? General Resistance must be lower than Ohm Test sequence 143 What to do if the protective earth continuity test failsAdditional test for coffee machine Citiz & milk What coffee machines have to be tested and when? Protective insulation test 145 Additional tests for coffee machine Citiz & milk 147 What to do if the insulation test fails 10.1Model Citiz, core unit Drange EF Expl Osion DRA Wings 149 Model Citiz, core unit Crange EF Model Citiz & milk, core unit Drange EF 151 Model Citiz & milk, core unit Crange EF Model Citiz & Co, core unit Drange EF 153 Model Citiz & Co, core unit Crange EF Pos.Component PA RTS L ISTRemark Pos Component 155 Connection cable UL 157 T E S