Flowmeter - Toshiba DWS-22A Series Service Manual

Part name
Funtion
Steps of Disassemble
Inspect Flowmeter
1. Open the protecting box and take out PCB(see the section"Part Name PCB");
2. With the door closed, unplug the CON2 wire(shown in below picture), then use the
multi-meter Diode shelf to test between black wire(FM) and blue wire(GND) to confirm
whether electrical pulse is sent out while water is passing through flowmeter, or not.
3. If there is continual electrical pulse, the multi-meter will send out sound "de" continually.
4. If there is no electrical pulse, the multi-meter will not send sound. In this case, it means
something wrong with flowmeter circuit. We should check the connection first. If the
problem hasn't been solved by re-connection, we should replace the air breaker..

Flowmeter

Flowmeter is integrated into Air Breaker. Function of flowmwter is measure how much
water has entered in appliance. it consists of impeller, tongue tube and terminal, etc.
When water pass through the flowmeter, moving water can rotate magnetic impeller,
the tongue tube can sense the impeller's magnetic and send electronic pulses.
Flowmeter
FM
GND
33