Installing Boiler Temperature Sensor to ‘Colin’

Firstly – Set target milk temperature of Colin above 140 degrees centigrade to avoid Colin flashing every time you use the temperature screen:

Rest hand on top of unit so ‘credits’ screen appears, and then hold down the White button to increase temperature to around 140c.

Next unscrew the two screws at the back of the top panel.

Rest the filler tunnel and top panel to one side keeping the earth strap attached.

Locate the Earth Clamp screw on the left side of the machine. This clamp both earths the unit, and places some pressure on the last-resort fuse inside plastic tubing. It is important to keep some pressure between the clamp and the last-resort fuse after this mod is complete.

Unscrew the screw and lift off the earth clamp keeping the earth wire attached to the clamp.

This rusty clamp earths and holds the fuse.

Slide the sensor through the back of the last vent on the reverse of the machine.

Bring the ‘loop’ of the sensor under the clamp and ensure the centre of the sensor sits under the actual clamp rather than in the small valley the fuse tube sits in. This can be fiddly and take a few goes to get it into the right position. The key is to retighten the screw applying enough pressure to firmly grip the fuse tube without crushing the new sensor.

This is how it should look after you have secured the sensor between the boiler and the earth clip.

Secure cable to the water pipe using tie wrap.

Create cable strain relief by tying a second tie wrap around the rear vent.

Installation complete.

It should now look like this. Reassemble case.