[Richard L]

I would reversion th wediretcion of flow to help clearing some debris that may be trapped inside the sensor.

You can take it apart and re-assemble it quite easily, follow the instuction below:


1. Undo the 4mm hose.
2. unscrew the 4mm fitting.
3. with a 13mm spanner on one end, avoid spinning the metal tube
4. You should now see the inside of the flow sensor tube.
5. With a 1/4" flat blade screw driver, unscrew the plastic scroll
6. At all time press reasonable hard to avoid slip and distort the scroll.
7. Once out, turn the FCM unside down , the little turnbine should fall out.
8. Clean and examine the inside of the tube, if necessary undo the scroll on the other side.
9. Reinstate the assembly as follows
10 make sure the tube is vertical.
11. Drop in the turbine andf ensure iot is centrally located.
12. Still keeping it vertical, screw in the plastic srcoll untiollit bottoms.
13. Un-wind 1/4-1/2 Turn
14. Shade the sensor, clicking sound means the turbine has clarance as it shuttles back and forth.
15. Blow through it, you shoudl heat the turbine spinning.

Re-asesmble and retest.