HR92 Valve Hammering

[henryblackman]

Hi Everyone,

I noticed in a recent post a point about valve hammering and apparently it being a ‘known issue’ with Evohome. I have a terrible issue with it on 4 of my 17 radiators when the TRV has the valve only open only 10 percent or so. I’ve replicated this by taking off the white plastic motor part (is the bit with the LCD screen and batteries) leaving the white and black part attached to the valve, and closing the valve by turning the black bit until it’s only 10% or so and the hammering begins unless it’s fully closed or opened a little more.

Do they simply need to be replaced? Or is there a setting where the valve, if open, can be kept open by 20% (or some other setting) to eliminate it?

Thanks,
Henry

[alisonmb7]

There seem to be very few replies on here so I'll add something which may or may not help. I've had problems with my valves sticking on a few of my radiators. I take the motor off, and unscrew the white and black component and then use a coin to press on the valve pin to mobilise it. Once mobilised I use wd40 which keeps it mobilised for a while. But it is part of my routine to go round and check they all open fully and smoothly. Don't know if it'll make a difference to you but it is very easy and maybe worth a go.

[Richard]

Hi Everyone,

I noticed in a recent post a point about valve hammering and apparently it being a ‘known issue’ with Evohome. I have a terrible issue with it on 4 of my 17 radiators when the TRV has the valve only open only 10 percent or so. I’ve replicated this by taking off the white plastic motor part (is the bit with the LCD screen and batteries) leaving the white and black part attached to the valve, and closing the valve by turning the black bit until it’s only 10% or so and the hammering begins unless it’s fully closed or opened a little more.

Do they simply need to be replaced? Or is there a setting where the valve, if open, can be kept open by 20% (or some other setting) to eliminate it?

Thanks,
Henry

High pump pressure across the valve seat (normally pump speed pump too fast), non-directional radiator valves or no automatic bypass valve are usually the cause for this.