Teka DW7 57 FI - User Manual

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Summary

Introduction to Service Manual

Control Panel Overview

Control Panel Layout and Indicators

Identifies and describes the main buttons and indicators on the dishwasher's control panel.

Error Codes and Troubleshooting

Dishwasher Error Code Descriptions

Details common error codes (E1, E3, E4, E6, E7) and their causes or behavior.

Key Electrical Component Specifications

Inlet Valve Details

Provides voltage and resistance specifications for the inlet valve.

NTC Sensor Temperature Resistance

Lists the resistance values of the NTC sensor at various temperatures.

Flowmeter Test Method

Explains how to test the flowmeter using a multimeter and observing electrical pulses.

Washing Pump Electrical Specs

Details voltage, resistance, and capacitor specifications for the washing pump.

Drain Pump Electrical Specs

Provides voltage and resistance specifications for the drain pump.

Heater Electrical Specs

Lists voltage, power, and resistance specifications for the heater.

Summary

Introduction to Service Manual

Control Panel Overview

Control Panel Layout and Indicators

Identifies and describes the main buttons and indicators on the dishwasher's control panel.

Error Codes and Troubleshooting

Dishwasher Error Code Descriptions

Details common error codes (E1, E3, E4, E6, E7) and their causes or behavior.

Key Electrical Component Specifications

Inlet Valve Details

Provides voltage and resistance specifications for the inlet valve.

NTC Sensor Temperature Resistance

Lists the resistance values of the NTC sensor at various temperatures.

Flowmeter Test Method

Explains how to test the flowmeter using a multimeter and observing electrical pulses.

Washing Pump Electrical Specs

Details voltage, resistance, and capacitor specifications for the washing pump.

Drain Pump Electrical Specs

Provides voltage and resistance specifications for the drain pump.

Heater Electrical Specs

Lists voltage, power, and resistance specifications for the heater.

This document serves as a service manual for Teka dishwasher models DW7 57 FI, DW7 41 FI, and LPI 759. It provides essential information for technicians to diagnose and repair these appliances, focusing on the service test, error codes, and electrical components.

The dishwasher is designed to clean dishes and cutlery through a multi-stage washing process. Users can select various wash programs tailored to different levels of soiling and types of dishes. The control panel, located on the front of the appliance, features an ON/OFF button, a power-on light, a delayed start button, a digital display, salt and rinse aid warning lights, a program button, and a program indicator light. These controls allow users to initiate, pause, and customize wash cycles. The display provides feedback on the current status of the dishwasher, including error codes and the progress of the wash cycle.

Service Test and Diagnostics

A key feature for maintenance is the integrated service test program. This diagnostic tool allows technicians to systematically check the functionality of various components. To activate the test program, the door must be open and the machine off. The technician holds down the Program button and simultaneously presses the POWER button until the machine enters the test program, indicated by "88" on the display, signifying initialization and standby mode. Closing the door then initiates the test sequence.

During the test, the Program button can be used to advance to the next step, except for the inlet valve step, which proceeds automatically. The test program runs through a series of steps, each designed to activate a specific component or function and display a corresponding code.

Step 0 (Initialization): Display shows "88". The machine powers on and enters standby.
Step 1 (Inlet Valve): Display shows "0A". The inlet valve opens, and the machine fills with 3.6 liters of water (or 3.0 liters in 45 cm models). This step verifies the water intake system.
Step 2 (Washing Pump and Dispenser): Display shows "09". The dispenser activates once, and the washing pump runs for 60 seconds. This checks the detergent dispensing mechanism and the main circulation pump.
Step 3 (Heating Element): Display shows "08". The washing pump runs, and the heating element activates until the water temperature reaches 57ºC. The machine then pauses. This step confirms the functionality of the heating system and the NTC sensor. The technician must press the Program button to proceed.
Step 4 (Drain Pump): Display shows "07". The drain pump runs for 30 seconds, verifying the water drainage system.
Step 5 (Pause): Display shows "06". The machine pauses for 10 seconds.
Step 6 (Inlet Valve - Second Fill): Display shows "99". The inlet valve opens again, filling with 3.6 liters of water (or 3.0 liters in 45 cm models). This re-confirms the inlet valve's operation.
Step 7 (Washing Pump - Second Run): Display shows "04". The washing pump runs for 2 minutes. This further tests the main circulation pump.
Step 8 (Pause): Display shows "03". The machine pauses for 5 seconds.
Step 9 (Washing Pump and Half Load Valve): Display shows "02". The washing pump runs for 1 minute. If the model is equipped with a half-load valve, it will also operate during this step, testing its functionality.
Step 10 (Drain Pump and Regeneration Valve): Display shows "01". The regeneration valve opens, and the drain pump runs for 30 seconds. This verifies the regeneration system and the drain pump.
Step 11 (Finish): Display shows "F1". The machine emits a single buzz, stops, and returns to standby. This indicates the successful completion of the service test.

Error Codes

The dishwasher is equipped with a self-diagnostic system that displays error codes on the control panel to indicate specific malfunctions. These codes are crucial for troubleshooting and maintenance.

E1 (Water filling exceeds pre-set time): This error occurs if the inlet valve has been open for 4 minutes, but the desired water quantity (measured by pulses from the flowmeter) has not been reached. When E1 occurs, the drain pump activates until the flowmeter remains motionless for 2 minutes, and all other components stop immediately. The buzzer sounds for 30 seconds, and "E1" is displayed. This suggests issues with water supply, inlet valve, or flowmeter.
E3 (Heating exceeds pre-set time): This error is triggered if the heating element has been working for 60 minutes, but the water temperature detected by the NTC sensor has not reached the desired value. Upon E3, the drain pump runs until the flowmeter is motionless for 2 minutes, and all other components cease operation. The buzzer sounds for 30 seconds, and "E3" is displayed. This points to problems with the heating element, NTC sensor, or the control board.
E4 (Overflow): This is a critical error with the highest priority. It appears if the overflow micro-switch activates and remains active for longer than 2 seconds. When E4 occurs, the drain pump runs until the flowmeter is motionless for 2 minutes, and all other components stop. The buzzer sounds for 30 seconds, and "E4" is displayed. After an E4 operation, all other error operations become invalid. This indicates a leak or a faulty overflow sensor.
E6 (Open-circuit failure of NTC Sensor): This error is detected by the controller during the test program if the NTC sensor has an open circuit. When E6 occurs, the drain pump runs until the flowmeter is motionless for 2 minutes, and all other components stop. The buzzer sounds for 30 seconds, and "E6" is displayed. This specifically points to a broken NTC sensor or its wiring.
E7 (Short-circuit failure of NTC sensor): Similar to E6, this error is detected by the controller during the test program if the NTC sensor has a short circuit. When E7 occurs, the drain pump runs until the flowmeter is motionless for 2 minutes, and all other components stop. The buzzer sounds for 30 seconds, and "E7" is displayed. This indicates a shorted NTC sensor or its wiring.

Electrical Components and Water Circuit

The manual includes a detailed wiring diagram and a water circuit scheme, which are indispensable for advanced troubleshooting. The wiring diagram illustrates the electrical connections between various components, including the power switch, rinse aid detector, float switch, salt detector, flowmeter, thermistor, dispenser, door switch, pressure switch for heater, thermostats, drain pump, wash pump, inlet valve, and regeneration valve. This diagram helps technicians trace electrical paths and identify potential wiring faults.

The water circuit scheme provides a visual representation of how water flows through the dishwasher during different stages: inlet water route, regeneration water route, cycle water route, and drain water route. Key components in the water circuit include the air breaker, top spray, upper spray arm, lower spray arm, softener, inlet hose, inlet valve, regeneration valve, washing pump, drain pump, pressure switch, and overflow switch. Understanding this scheme is vital for diagnosing issues related to water intake, circulation, and drainage.

The manual also provides descriptions of individual electrical components:

Flowmeter: This component measures the quantity of water entering the dishwasher by sending electrical pulses as water passes through it. Technicians can test it using a multi-meter in diode testing mode to check for these pulses.
Washing Pump: This is the main circulation pump responsible for spraying water during the wash cycle.
Drain Pump: This pump is responsible for expelling water from the dishwasher at the end of a cycle or during error conditions.
Heater: The heating element raises the water temperature to the desired level for effective cleaning and sanitization.
Inlet Valve: This solenoid valve controls the flow of water into the dishwasher from the main water supply.
NTC Sensor: The Negative Temperature Coefficient (NTC) sensor monitors the water temperature inside the dishwasher, providing feedback to the control board for accurate temperature regulation. The manual provides a table of resistance values at different temperatures, which is useful for testing the sensor's functionality.

By utilizing the service test, understanding error codes, and referring to the wiring and water circuit diagrams, technicians can efficiently diagnose and repair issues in Teka DW7 57 FI, DW7 41 FI, and LPI 759 dishwashers, ensuring their proper functioning and extending their lifespan. The detailed information provided in this manual empowers service personnel to perform comprehensive maintenance and troubleshooting tasks.

Teka DW7 57 FI Specifications

General

Door color	Not applicable
Water fill	Cold, Hot
Display type	LED
Tub material	Metal
Built-in display	Yes
Appliance placement	Fully built-in
Control panel color	Stainless steel
Cutlery compartment type	Basket
Connected load	1900 W
AC input voltage	220 - 240 V
AC input frequency	50 Hz
Water consumption per cycle	12 L
Energy consumption per cycle	1.05 kWh
Installation compartment dimensions (WxDxH)	600 x 570 x 570 mm
Noise level	49 dB
Delay start (max)	24 h
Dishwashing programs	Eco, Quick
Number of place settings	12 place settings
Number of washing programs	9
Number of temperature settings	4