Centra heating fault finding need help please

[Chrisg4239]

I currently have a closed system boiler install, with 2 2 port motorised valves being controlled by HIVE.

Recently, the boiler doesn’t fire up when the central heating shedul is due on, I have changed the batteries in the stat, rebooted everything that can be rebooted, checked the where’d connections. If I turn off the power to the Hive receiver and back on again it kicks in. Sometimes when I press the boost or manual button it kicks in.
I have been told this could be a fault with the motorised valve, due to the micro switch in it sending a signal to activate the pump and boiler once open. The valve is clunky it doesn’t feel like the valve turns the motor or potentially opens the valve.
before I go pulling the valve apart, or purchasing a new one, I would appreciate any suggestions as to what might be wrong?

thankyou for your help

 

[cross thread]

have you 240 v o the brown wire to the valve when the heating is on ? That should power the valve open and then put 240 v onto the orange to fire the boiler

 

[Chrisg4239]

have you 240 v o the brown wire to the valve when the heating is on ? That should power the valve open and then put 240 v onto the orange to fire the boiler

Thankyou, i will try that this morning, am i right in thinking that when the valve closed, i should be able to use the lever to open the valve/move the motor slowly and then lock it in position. ?? At the minute it just feels clunky

 

[cross thread]

That will open the valve but won’t make the electric contact,so it would work if hot water is also calling for heat
some valves can have the syncron motor replaced inside. What valve make have you got.

 

[Chrisg4239]

That will open the valve but won’t make the electric contact,so it would work if hot water is also calling for heat
some valves can have the syncron motor replaced inside. What valve make have you got.

I have 2 Honeywell valves, CH one is older thank the HW one

 

[Mottie]

I have 2 Honeywell valves, CH one is older thank the HW one

I have Honeywell valves too.

I had the same problem with mine. Power the system off, power it up and it worked okay in my case. A few weeks ago though it was getting worse so I fitted a new electrical head on my heating 2 port valve and that’s cured the problem.

Odd problem with heating/boiler. One-off or something on the way out?

Odd problem, as above. Just got home from a weeks break. We have a sealed 'S' plan central heating system and unvented hot water. Vaillant ecotec boiler, Honeywell digital room stat, controller and motorised valves. When I went away I turned the hot water off at the controller and left the...

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