2 port sunvic diverter valve not activating

[Infinite82]

I have a sunvic 2 port diverter valve on a tribune HE hot water tank, it's not activating when hot water needs heating. I've replaced the thermostat, but have to hit the diverter valve a few times to get it to activate. Any idea what may be causing the motor to stick as it is working just needs persuasion with a smack.
Thank you

 

[Brambles]

Do you mean that the valve does not open or that the boiler does not fire?

If in doubt change the actuator, rather than the component parts.

 

[Infinite82]

Do you mean that the valve does not open or that the boiler does not fire?

If in doubt change the actuator, rather than the component parts.

I will let tank get cold and then I'll turn on hot water at boiler controls, if it doesn't fire is this because of thermostat not sending the signal? I normally turn on hot water at controls then hit the diverter valve to get it to open. It seems to turn itself off and close again when temperature is achieved juat doesn't activate to start.

Thank you for reply

 

[Stigster]

If the motorised head is still moving when calling for heat and the boiler firing but it is sticking as you describe, it's usually the valve body that is at fault.

If that valve has an easily removable motor head, take it off and see if the valve spindle is easy to turn. It should be possible to easily turn the spindle with just your finger tips. If it's any harder than that or you need to put tools on it to make it move (they only move about a quarter turn if that BTW) then the valve body will need replacing.

If the spindle is sticking and the motor head can't turn it it will burn out the motor soon enough.

 

[Harvest Fields]

Afternoon mate. Sounds like you need a new diverter valve head. Don’t fit a sunvic though. Got a danfoss Hpa head

 

[Danb]

Stat was probably fine check the moving parts If you can,
Heads either not making its swich (faulty head)
Body could also be seized so the head cant make its switch faulty body,
I would just replace the whole 2port.
Hope this helps.

 

[townfanjon]

I have changed hundreds of those no joke , all the advise you need is above . Toolstation sell them .