central heating

[Maureena]

i have altered my timing clock to call for hot water only and no heating.
however the radiatiors still come on hot. When i had the pump replaced ( the old one gave up) the plumber made some comment about the 2 port valves in the wrong positions! I think he set them to manual. What positions should they be in to have hot water and no heating. I moved both the switches to auto which stopped the radiators getting hot. Ok so i thought, however it gets a bit chilly at nite and i put the heating back on on the clock but got no heat. What positions should the switches on the top on the valves be in?

 

[kirkgas]

sounds as if 1 or both the zone valves are faulty, the switch on the side is to manually open while filling up the system so that the water circulates, if the switch is pushed over and locked up the valve is open so when the boiler is on the water will flow through the valve, sounds as if that is what is wrong with your system, as a short term measure you could lock the heating valve open to allow rads to heat, but the timeclock and/or zone valves will need to be checked over

 

[pauls]

i had a similar problem on a 3 port the other week i came down to when the hot water was on the ball inside the valve was letting by and heating up the rads, changed the valve job sorted.

 

[tamz]

You need a new synchron motor in the heating valve and if you can work a screwdriver it is easily changed.
Buy a new synchron motor (cost under a tenner from most plumbers merchants)
Kill the power to the heating
Remove the cover off the valve (slacken small star screw and pull it off)
The motor has 2 orange wires, unplug them if thy have spades or cut them leaving at least 1".
Remove the small screw (maybe 2 depending on how old the valve is) and don't loose it.
Remove old motor and fit new one.
Replace screw(s)
Join orange wires using the connectors that came with new one.
Replace cover and tighten screw.
Turn power back on.
Sorted

 

[WHPES]

In the meantime, if you look on the side of the zone valves you will see a lever which manually pushes across and can be made to sit on a notch to keep it permanantly open. To knock off the heating, pull the lever off the notch and allow it to go back to the closed position.