Two questions - one MG related

1/. Would anybody who has an MGTF newer than 02 let me know if the fuel gauge stays at the level or settles back to zero when the ignition is off/overnight?

2/. could somebody tell me what i should be connecting and where to in the following ( figure 2)?

It's a thermostat for the heating - lcd with battery backup.
I (think I) know I need a live, a switched live, and a neutral but so far I've gone through three fuses and several loud bangs. :coat:

Can't help with number 2 but on my 04 TF the fuel gauge drops to zero with the ignition off.

don't think you need a ground as its battery powered. Diagram doesn't show anywhere for ground.

Perement live to pin3 , pin2 probably no connection and pin1 return back to boiler or timer.

andy1970h wrote: Can't help with number 2 but on my 04 TF the fuel gauge drops to zero with the ignition off.

That's a relief, because I had to replace the fuel gauge on mine and prior to swapping the fuel gauge stayed up but now it drops. i thought I might have broken it.

Psymon wrote: don't think you need a ground as its battery powered. Diagram doesn't show anywhere for ground.

Perement live to pin3 , pin2 probably no connection and pin1 return back to boiler or timer.

It's only battery back up. It's supposed to run off the mains.
I can get it to switch the pump on and off with the thermostat and display from the battery. Take the batteries out and it stops working.:shrug:

David for 2, Live in goes to 3 COM, when the temperature drops the thermostat will switch and allow the 'switched live' to go out from 1. You will not normally use 2 unless you want a switched live when the temperature is above the one you set, if for instance you want to switch a cooling appliance on.

The connection of Neutral is made at the appliance/boiler.

Phone me if you need any more help

David Aiketgate wrote:

Psymon wrote: don't think you need a ground as its battery powered. Diagram doesn't show anywhere for ground.

Perement live to pin3 , pin2 probably no connection and pin1 return back to boiler or timer.

It's only battery back up. It's supposed to run off the mains.
I can get it to switch the pump on and off with the thermostat and display from the battery. Take the batteries out and it stops working.:shrug:

Psymon was correct sorry I was slow typing.

Your data sheet says the thermostat is battery powered NOT mains

Ah, That probably explains why when I tried to connect all three there was a big bang. I had live to 3 switch to 2 and neutral to 1.

:omg: Oooouuuch :blink: No wonder you got a bang, still it wakes you up :bust:

It's not mains powered...it's battery powered!

As PDQ says, live to 3 and 1 goes to the switched item ie the pump/boiler/heat source.

Ok, it's battery powered. :yesnod:

Now if i put an ohmeter across 3 and 2 and rotate the dial I get an on /off when the thermostat clicks.
If I put the ohmeter across 3 and 1 and rotate, I get nothing.

Have a look at page 15 on here: http://www.thermsaver.co.uk/media/pdf/controls/thermsave-celect-programmable-thermostat-guide.pdf

NO means Normally Open and is Number 1 on your diagram.

NC means Normally Closed and is number 2 in your diagram. Nothing is connected to this one.