baxi duo tec hea

[buckley plumb]

on the baxi duo tec hea to test the hw flow sensor there should be 5 volts between red and blue wires - but what should the white wire give you ? when no demand then with a demand is it like the vaillant flow turbine 5v and on signal 2.5 or 0 depending on position

 

[Paulplumb]

Hmm I am a rank amateur at diagnostics but I seem to remember if you remove the hall sensor and run a hot tap then stick a magnet (Like a pick up tool) in the hall sensor the boiler should kick in.

 

[buckley plumb]

Hmm I am a rank amateur at diagnostics but I seem to remember if you remove the hall sensor and run a hot tap then stick a magnet (Like a pick up tool) in the hall sensor the boiler should kick in.

it should but if it does not need to prove wether sensor or pcb

 

[Paulplumb]

fault finding Flow chart here for a platinum HE A

Baxi Platinum Combi HE A Quick Start Manual PDF Download Page 56 - ManualAgent

Certainly on that it says red and blue must be more than 5v

Ah just found the duo tec manual and that states the same

http://www.google.co.uk/url?sa=t&rc..._UmfyA-OyNZneRo0oRo7NQg&bvm=bv.82001339,d.bGQ

 

[arran197]

There's a red led on the hall effect sensor pcb. If that doesn't light up there could well be a problem with the magnet in the manifold or crossed pipes causing the flow to be the incorrect way. Normally the led will come on with a small magnet pressed against the plastic housing in the sensor.

 

[Taffman]

i will have to try that trick!!