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Help please with my Central Heating / Hot water Programmer Timer

rruwalton

ISP Rep
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
 
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=cach...sunvic+select+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.

I dont want to mess with the timer right now as my young daughter is asleep in the room next to where the timer etc are located.
 
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Perhaps the room stat was defective and causing it to keep switching. It may now have failed completely. You need a multimeter.
 
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Hello Andy,

Thanks for your help and the links :)

The existing timer was 15 years old and the connections are slightly different.

I have now been banned from touching the timer by my wife who has arranged for a heating engineer to sort the job out, however, I am sure that I could have sussed it now I have more information.
 
Yes Andy,

She's arranged for someone to come round and sort it. That will cost me a few tanks of fuel for the bike ;)

TBH, I am sure I could sort it. I found a website which is full of engineers who will talk me through it.

:)
 
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