Stuart Turner Monsoon U1.5 bar Twin Installation, Operation & Maintenance Instructions Manual page 35

13.3 Flow Switch Circuit Test
1. First confirm visually that the flow switch reed clamps have not been
dislodged during handling or installation. The clamps must be fully
located within their flow switch body groove as shown.
2. To carry out the following test you will need to obtain a magnet, a
typical fridge magnet is suitable.
3. Ensure the power supply is switched on.
4. Position the magnet directly in front of the reed clamp as shown. If
pump does not start, then slowly move the magnet up and down to a
position that exceeds the extent of the reed clamp. The pump should
instantaneously start at some point during this extent of movement. If
this does not happen, this indicates a possible fault with the reed switch
or the P.C.B which is located within the terminal box. These should be
checked electrically. Consult Stuart Turner for further instructions.
Groove
Body
Reed
clamp
Figure 17
33
Magnet