Miele W 1918 Technical Information download pdf (Page 34)

Technical Information

W1900 Series Clothes Washers

4.18 Program Control

The Program Control consist of the Electronic Control Unit (Upper

Electronic) and the Power Supply Electronic Unit (Lower Electronic).s

Functions of the Electronic Control Unit include:

 Precise program and component control

 Monitoring circuits (i.e. motor speed, temperature etc…)

 A Fault Finding and Service Mode

 Program Mode (W1966 & W1986)

Functions of the Power Supply Electronic include:

 Providing the Electronic Control Unit with the “zero crossover point

signal” (used for timing)

 Component switching (via relays and thyristors)

On models equipped with the Delayed Start feature, a third electronic is

installed. This Electronic provides the delay control and also contains the

numeric LEDs, for displaying the remaining wash time to the user.

Important!

If an Electronic is suspected to be faulty; the "Electronic Test" procedure

must be performed

. Refer to Section 5.13 – Determining Which

Electronic Requires Replacement.

4.19 Heater Relays

Switching of the two Heater Elements is performed via two relays. Both

relays are controlled by the Electronic, and are energized when:

1. The program calls for heating AND

2. The water level is at an acceptable level (as determined by the Level

Switch).

Service Tip:

Even in the Service Mode the Water Level Switch must be satisfied

before the Heating Relays & Elements can be powered on.

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Miele W 1918 Technical Information Page 34