Hot water but no Central Heating...Doh!

[ivor@mailinator]

Hi Guys,

I've got a Glow Worm 40RR Regular/cylinder Boiler, hot water works fine (and diag neons X 4 light up upon PCB when fired up) But the Central Heating doesn't even fire up and theirs no neon diag lights appearing on the PCB, even the Power diag neon is off.

I've replaced the PCB, sync motor in the midpoint valve and the room thermostat, if I manually move the port valve when the water is on to open the radiators heat up.


Any ideas anyone why I get no power on the PCB only when the central heating is on and not the water all I can think the programmer is at fault..???


Cheers for any help folks

 

[Millsy 82]

Re: How water but no Central Heating...Doh!

Programmer, Room stat or 3 port valve stiff and not going far enough to turn heating on.

 

[ivor@mailinator]

Thanks Millsy (weird my surname is Mills and I'm also called Millsy must be an omen !) Room Stat is about 2 weeks old clicks and moves the Port valve when engaged must be the programmer.

 

[Millsy 82]

Does the heating work when hot water is on at the same time As it might be a wiring issue, Otherwise if you have power getting to the stat then it wont be the programmer it will be the 3 port.

 

[Whn1]

Do you have live at the white when room stat is turned on?

 

[ivor@mailinator]

The Heating doesn't work when the hot water is on and yes I do have 'Live' on the White guys....I have replaced the motor in the 3 port today must be the mechanism..?

 

[ivor@mailinator]

Slight update..(mainly for Millsy) just noticed that the radiators are getting warm slowly when the HW and the CH are on together but the CH won't fire up on it's own at all....

 

[PlumbBobBob]

when the hot water and ch are on at the same time the three port valve is in the mid position, but when in ch mode the valve isn't moving over to the correct side. there could be a restriction in the valve itself.

 

[Whn1]

Orange live when whites live, when heating on only?

 

[ivor@mailinator]

Checked valve markings - when program on HW shows W on valve, when program on CH shows H on valve and when program on both HW and CH shows Mid position on valve, but at no point will the central heating start by itself.....

(Whn1 the only orange I have goes to the flue fan but white is live even of the CH is off)

 

[dougal]

are you getting 230v on white wire on mid position valve, if so all external controls o.k faulty mid position valve not making switch.

 

[Whn1]

Sorry should have stated I ment orange on the 3port valve.

 

[ivor@mailinator]

Yes getting 230v on white wire on mid position of valve and also Orange live when whites live, when heating on only....Perhaps the Valve Micro switch at fault then..???

 

[Whn1]

That's where I would start..


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I am here: http://tapatalk.com/map.php?jjec51

 

[ivor@mailinator]

Cheers Guys !

 

[ivor@mailinator]

Whn1 I made a bit of a boo boo on the Meter readings should have read:

White 230 v
Grey 230 v
Orange o v...!

 

[Whn1]

When Ch or hw are on you should have 230 at orange.

 

[ivor@mailinator]

Yeah no 230v at orange when the CH is on so looks like the pcb or micro switch in the 3 port valve.

 

[ivor@mailinator]

RESOLVED:
Just incase anyone is following this thread or has a similar problem the problem was faultly switching by the micro switch in the Actuator, the cam angle on the plastic arm had worn just enought so the micro switch would not engage, slight adjustment in the micro switch position has temporary sorted the problem, ultimately I will have to replace the faulty part.
Thanks to everyone and special thanks to Whn1.