Anyone on here works with Central heating.....

Ok All - got a problem with the Central Heating system, and wondered if anyone on her is into this stuff as a job, or might knwo whats up.

Problem is that when the Hot water comes on via the timer, the Central heating system also comes on. The timer is set to Off for the central heating and the thermostat is wound right down to its minimum setting.

Just started doing this the other day, any one got any ideas on what it could be or any ideas on what to check ?

turbtechnicsMK1 said

Just started doing this the other day, any one got any ideas on what it could be or any ideas on what to check ?

I reckon it's knackered and you should check out the central heating!! :dance:

(Sorry - couldn't resist that one, the sun's gone to my head! )

Hairyarse said

I reckon it's knackered and you should check out the central heating!! :dance:
(Sorry - couldn't resist that one, the sun's gone to my head! )

   

and the Blooming hot radiators are getting to me  - its like damn Sauna in here      

So any other "better" ideas ?

Get yourself over to DIYnot.com and join the forum there.  Worked for me when my central heating went. Very busy forum so describe your problem fully in your first post otherwise your thread will get lost on page 2.

Thanks Rivageman - will give that a whirl  

Turbo - depends on what central heating system you have got.

Some have a pump and two solenoid valves - one for hot water and one for CH.  Others have gravity hot water and only run the pump for CH.

My money is the first one and your CH solenoid valve is stuck open.  They are usually near the pump and have a level on the top to manually open.

Thanks for the pointer Rich.

Found one valve when I was having a poke about on th emain piepwork by the boiler that has what looks like a solenoid type valve on it wiht some wires coming out. Has a couple of pipes running to it. All the pipes get hot when the boiler is on, so my guess is this is some form of control valve and should not let one of the outlets get hot when the heating is not on. My guess is that this is not closing. Sound logical to anyone, and if so can it be fixed (I can take the cover of it as its only held on by screws) or perhap a tap with a hammer to free it off  

They probably fail open for safety.  Not sure if that is the one.  I'd replace the valve rather than try and repair it.

crazyquiff said

Turbo - depends on what central heating system you have got.

Some have a pump and two solenoid valves - one for hot water and one for CH.  Others have gravity hot water and only run the pump for CH.

My money is the first one and your CH solenoid valve is stuck open.  They are usually near the pump and have a level on the top to manually open.

I've had this happen on a preious house, the solenoid was at fault, about ?20 plus fitting.

Could also be that the hotwater is hot enough and the CH is acting as an overflow. Possible faulty hotwater thermostat?

change your heater matrix mate No, seriously, I had this problem too. As said above just change the innards of the faulty valve. The wiring is easy just make a careful note of where the old ones went.DIY in ten minutes  :wink:

I had the same problem, and the heating engineer corrected the fault by rewiring the programmer. My boiler had only just been upgraded though.

Cheer's guys - will take the cover off in the morning and have apoke about.  

I love Plumbing    

From your description you have a "3 port motorised valve" . Easily identified by looking at it , it should have 3x22mm pipes going in to it and a white electric cable . On the front you will see a cover with the power off remove the lower screw and take off the cover , look inside and there will be a round motor with wires to it , these are crimped to the electrical flex leaving the valve . This motor is the only servicable part of these valves you may be lucky and find that its faulty . Removal is straight forward including cutting the crimps off the wire . If its not the motor a new valve is needed and i always use http://www.mjtcontrols.co.uk/ who deliver rapidly . Search thier  site and buy just the motor or call a plumber to change the valve if you not confident to do it yourself . I am not a fan of the 3 port valve , when it fails it fails and prefer depending on the system to have 2 X 2 port valves instead .

Wow and blocked drains are my favourite  

Blooming 'eck Chudd  :notworthy: !! Thanks for this mate. I hope its the motor (could do with saving a few quid  :wink: ). AS for Blocked drainds, I'l l et you know   , but my old man fell into our old Sespit once - that was quite funny…………. although he smelt for ages