wiring problem

[desrob]

fully pumped system, mid position valve,i can not get the heating to work when called for by programmer and room stat, it will only work when heating and hot water are called for. the pump ,mid position valve and cylinder stat are wired to a wiring centre and the room stat is wired to the programmer,all seems to be in order any ideas

 

[PlumbBobBob]

what sort of programmer is it? is there a jumper on the back that needs changing for pumped or gravity?

 

[Billy Bob Bob]

either its a wiring fault or the 3 port has died

 

[SimonJohns]

Has it worked before. If so. 3 port is dead

 

[desrob]

what sort of programmer is it? is there a jumper on the back that needs changing for pumped or gravity?

thats what i thought but the punter says it use to work,but i learn't not to listen to them,but i did not check. i am

 

[Mbear]

What u may have is a 3port diverter valve rather than a mid position valve. (If this is the case)As said above u should Make sure the link is at gravity on the back of timer. This will give u hw only and hw+ch.

 

[desrob]

either its a wiring fault or the 3 port has died

the 3port seems to be moving how can i tell it

 

[SimonJohns]

May move. But the micro switches inside could have failed.

I would advise to check all wiring and If all is correct. It must be valve. Depending on valve you can just change actuator. Don't get as wet that way


Btw if you have an iPhone. There's a excellent Honeywell app with wiring guides

 

[desrob]

What u may have is a 3port diverter valve rather than a mid position valve. (If this is the case)As said above u should Make sure the link is at gravity on the back of timer. This will give u hw only and hw+ch.

it is a 3port, i do have a habit of refering to them as a mid position i am getting hw only and hw +ch now it's ch only i can not get,are you saying if i change programmer from gravity or to gravity

 

[Mbear]

it is a 3port, i do have a habit of refering to them as a mid position i am getting hw only and hw +ch now it's ch only i can not get,are you saying if i change programmer from gravity or to gravity

Change to gravity, if u do this, then when u turn heat on the heating and hw LEDs on timer will both come on even though u only selected heating. When u put the hw on alone the hw led will come on itself

 

[tamz]

It's the valve. Test the wires. You should have 230v on the white grey and orange when on for ch only.
Check the valve by removing the white and grey wires and putting them in a permanent live. When you turn the power on the valve will move across and should send power down the orange to kick in the boiler and pump.
If this doesn't happen change the valve.

 

[Puddle]

Had one today changed over to heating only but just missed activating the micro switches inside,(bottom one activates pump and boiler)you can adjust but best to just replace head,test as tamz says but remove head cover first and see if it is moving over to heating only position,if so above

And as luck would have it,had a nearly new head taken from a combi conversion I did just before xmas :smiley2: