Central heating not working

[dholi85]

Hi,

i have a Vailliant Eco 630 boiler and mega flow.

this morning I went to turn the heating on from the room stat, it clicked but the radiators haven't heated up after a hour which isn't normal.

i had a look at the boiler and there are no error messages, and the programmer is set to continuous. The pressure is good at 1.5bar.
The flow and return pipes are hot, and my hot water is still hot I.e. Could be because it is stored.

I'm thinking it could be a faulty 2port zone valve? as the pipe work after the zone valve connected to the central heating is cold. Where as the pipe work to the after the other zone valve connected to the megaflow is hot. I tried to manually move the pin on the zone valve to manual, and it didn't do anything, it was loose like its broken. Is that normal. Because the other zone valve has some tension and can hear it engage.

Any help ell would be good.

thanks

 

[Reg Man]

Normally you would get some tension when manually opening the zone valve. If the boiler is firing up and working for the hot water, it must be a problem on the heating control side of things. I would check the rads for air, by bleeding them first and re-pressurise the system. Then I would do some electrical tests on the heating control wiring, to establish what is and what's not working. Programmer, roomstat, zone valve.

 

[oz-plumber]

If your Room stat has batteries in it - replace them with new batteries.

 

[Meady]

By the sounds of things if the pin is moving freely that normally means the valve has opened, but if it isn't letting water through then I would say something is wrong with the two port valve

 

[EPH]

If its moving freely and there's no heat going through its more likely the end switch has gone. Very simple to check if you're competent nod usually a very simple repair.

Also, if you put the hot water on at the same time that should heat your radiators up for now.

 

[dholi85]

Thank you for the help everyone.

The zone valve for the hot water is working fine, and operating as it should.
The zone valve for the central heating doesn't seem to open (i.e. the pin not moving freely)

I've now done as you said "eph" I've manually flicked the pin over on the zone valve to manual. and the central heating works for a bit when the hot water is being used.

Anyone know why a zone valve would go?, it's only been a year since being installed?

 

[kay-jay]

Thank you for the help

Anyone know why a zone valve would go?, it's only been a year since being installed?

Depends really. Cheap stuff can fail anytime. Bet its not a honeywell.....

 

[SimonG]

Quality of valve, location of installation, condition of system, number of times operated etc. Will all aid in premature failure.

 

[dholi85]

Depends really. Cheap stuff can fail anytime. Bet its not a honeywell.....

It was A Honeywell 2 port zone valve, on a new install thats why I was surprised. Think I need to write them a letter.

 

[mountainman]

Check posts 2 & 3, the zone valve is the last item in the switching sequence.