Help please with my Central Heating / Hot water Programmer Timer

[Defender]

My central heating / hot water programmer timer cracked up yesterday as a relay went pair-shaped, so I went to B & Q and purchased a new one.

My brother- an electrician swapped the wires like for like but, although we have checked and re-checked the wiring the thing wont work properly. He has no real experience of c/heating systems.

At the moment the hot water heats up but the thermostat for the central heating has no effect. You seem to need both the hot water and central heating on to get the pump working. I am sure we have misplaced a wire. If you alter the valve to manual which is in-line with the tank, the central heating works. Its a bit of a mystery and to sort it we need to work out the wiring colour codes.

So I'm after some help with the wiring please. The wires must be colour coded i.e. blue = neutral / red = live. However, I also have yellow, orange and brown wires.

The following units connect into the timer with there being 6 connection terminals on the timer, 2 being a live feed and neutral, so only 4 other terminals. Hot water / Central Heating.

I have a valve, a spur supplying voltage, thermostat wires from the water tank, and a pump.

If someone could give me some guidance I would be much obliged.

Thank you in anticipation :)

[dirtydog]

Hmmm unfortunately the colour of the wires probably wont help much as sometimes people use whatever wire they've got lurking in their van. Normally the terminals are numbered in the programmer so worth comparing the two programmers to make sure they tally up.
Althought there will be commonality with the red/black or brown/blue being lives and neutrals

[dirtydog]

Best advice would be check manufacturers instructions as they normally have wiring details

[Defender]

Apollo boiler in kitchen

C/heating thermostat in living room

Copper tank, valve, pump, timer (with fused spur) in an upstairs cupboard adjacent to a bedroom.

The tank has a thermostat located 1/3 of the way up the tank.

The valve has pipes which run to the copper tank and pump.

Thermostat, valve and pump each have flex cable going to timer.

The timer also has feeds from the boiler.

Here's some info on the new timer:
http://64.233.183.104/search?q=cache:qG0ScgJh7UUJ:www.baked-design.biz/datasheets/Select%2520XL%2520A3%2520V4.pdf+wiring+sunvic+sele ct+207+xl&hl=en&ct=clnk&cd=1&gl=uk

Some of the wires were paired i.e. orange and red and brown
white and blue
grey and blue

My brother has paired the same wires which were paired up in the myson microtimer connection plate - then connected the ones which were in the terminals connected to the previous timer to the new timer connection plate.

[dirtydog]

If he has kept the wires paired then the only thing i can think of is the terminals from your original timer are in a different order to your new programmer if you see what i mean?

[dirtydog]

I am presuming your new programmer is different to the old one?

[Defender]

The old timer was a Myson Microtimer whereas the new one is a Sunvic Select 207XL. I think my brother has messed up. The only consolation is we have hot water and at least its not winter and cold!