buzzing diverter valve

[PlumberGraham]

Hi, I've got a system with a Honeywell F4 9943 three way diverter valve. The heating and water systems appear to work ok although the pump seems really hot. Throughout the whole day there is a loud buzzing noise from the motorised head of the diverter valve. The only way to stop the buzzing is to switch off the electic supply to it. Any ideas please?

 

[GrahamM]

Sounds like the divertor valve motor is on way out.

 

[PlumberGraham]

Thanks. How much of a job is it to change the motor? I think the whole central heating system was installed approx 10 years ago.

 

[GrahamM]

Not sure of the specifics for that particular valve but if the motor is replaceable it will be 15min job. If whole valve needs replaced then wee bit longer.

 

[helpsy]

I think if its a Honeywell valve and it has a raised dimple on motor casing or you can see the gasket sandwiched or a gap between body and motor casing it's changeable,if not it's the whole valve replacement.

 

[helpsy]

Make sure that you keep the valve/body free of any clothing that may be in the cupboard, so as no excessive heat build up.