I Have a 3 way valve controlling central heating/water Honeywell?

Question

I think it is sticking. Do I need to replace the brass body also?
I have water only on yet some rads do get a bit warm.
Will I have to drain my system? To replace.

Answer 1

If you are sure that it is faulty, you only need to replace the powerhead, no draining is required (Unless it is a very old model 18+ years old) Check that the controls are switching power to it properly before assuming that it is faulty. It could also be a failed motor, also easy to replace.

Please note that there are two types of 'three way' valves, Diverter and Mid-position, don't get mixed up!

http://content.honeywell.com/uk/homes/spares.htm

http://content.honeywell.com/uk/homes/Catalogue/Heating%20Controls/2.20%20V4044.pdf

http://content.honeywell.com/uk/homes/Catalogue/Heating%20Controls/2.21%20V4073.pdf

Answer 2

Honeywell 3 Position Diverter Valve

Answer 3

Either the actuator is not moving the valve or the valve body is sticking (brass body)
yes u have2 drain the system ,but only to below the level of the Valve.

Answer 4

You don't even necessarily have to change the head, you can just change the unit inside the box, as a plumber, doing a job, I would change the valve, this is because if you don't, it is sods law the valve will go, then when you explain to a client, they tend not to believe you, so is better to make sure.

Answer 5

try the manual over ride switch first to check its the motorised valve, then test the electric connections (you should be part 'p' qualified to do this) this will tell you if its the valve or not.

if you do change the valve the you should have isolation valve on each side, use to remove value without draining system.

Answer 6

I don't know anything about central heating, so check these sites for help ;)

US: http://goo.gl/kfyaUT
UK: http://mypro24.co.uk/form/central-heating-fuel-not-specified