DIY Doctor UK DIY Forums

Hello I bought a Heatmiser PRT/HW from recommendations on this site and thought it would be a straight swap for my invensys up2 duel channel controller, however I cant seem to make it work.

I thought it would be a straight swap but the wiring is different and I was wondering if somebody could steer me straight.

At the back of the box there are 2 cables on being a power feed and the other with the wires going to the various HW/CH components

The wires at the back of the Old Box are this

N: The blue wire from the feed and the blue wire from the control
L: The Brown wire from the feed and the Brown wire from the control

ON HW: Black
ON CH: Empty
OFF HW: Red
OFF CH: Yellow

The Wiring Diagram for the new Unit is this
[img]http://i39.tinypic.com/2aih5oh.jpg[/img]

I had some sucess wiring
N: The blue wire from the feed and the blue wire from the control
L: The Brown wire from the feed and the Brown wire from the control
A1: Red
A2: Black
B1: A link Wire to Live
B2: Yellow

However this would only turn on the water pump and not activate the boiler.

Any Pointers on what I need to do to wiring in this new unit?

Many thanks in advance for your answers