11
3.
Flow switch checking
Definition:
Flow switch (Reed sw.) is a vacuum tube with two thin metallic strips at open circuit
(NO) configuration while on standby. It activates or goes on close circuit by use of a magnet.
Below you will find two different ways to check the flow switch.
3.1) Option 1: Set unit at vertical direction
-Set Multi meter to Ohm range "Ω" or " )))) " and unplug the reed switch connector from the
printed circuit board (PCB) and check Reed Switch as in the pictures.
Check
Meter Result
Cause
Action
Pole -Pole
"Beep" signal "
)
)
)
) "
Reed SW contact closed
Change new one*
No signal "OL" or (∞ Ω)
Pass
No action
* Recommend replacing magnet set at the same time.
UP
Pole - Pole
