Baxi 360 pf ...Hot Water but no Heating

[matt1e]

Hi sorry about delay, did what you said and the boiler fired after a 10-20 sec delay, but the leaver on the valve did not move , it stayed at the bottom torwards (auto)..thks

is the central heating working?

the lever will stay put but if you now try to move it it will feel loose (no spring resistance)

if the heating is on then it looks like you have a problem with your cylinder stat or wiring or balancing issues
turn it up to about 55-60 {the stat on the hot water cylinder)
does the central heating still work

Matt

 

[sellyservice]

HI
thanks will drop the cyclinder stat to 55 and see how it goes, thanks for taking time to help..regards

 

[sellyservice]

Hi
Turned the cyclinder stat to 55, when i got home tonight CH had come on but main rads were just luke warm and bathroom rads were baking hot, when you turn the HW water off on the programer and leave the CH on ,the boiler cuts out , it seems you can only get CH when the HW is switched on..Thanks

 

[matt1e]

when you turn the HW water off on the programer and leave the CH on ,the boiler cuts out , it seems you can only get CH when the HW is switched on..Thanks

does the ch stay selected "on",on the programmer when you turn off the hot water, or does it switch off the same time automatically?

Matt

 

[sellyservice]

Hi
you can turn off the HW on the programer and the CH stays on(on the programmer)..thanks

 

[MANDATE]

This seems to be another of these cases where you get CH with HW but can't get CH only.
There 2 reasons why this happens.

1.The valve may be moving to CH position, but a faulty micro switch will stop boiler from lighting. (change actuator head)

2.It could be the valve is not moving to CH position, so it can't trigger the micro switch. This could also be due to faulty actuator head, but it could also be a wiring fault.
It has been known for a 'wire' from programmers (HW OFF term)to feed the valves 'grey wire' to have been omitted, which prevents the valve being drive beyond mid position.

 

[MANDATE]

Just re-read your statement 'load of rubbish from day 1'
That is beginning to sound as its never operated correctly, perhaps cause it was never wired correctly

 

[matt1e]

Hi
you can turn off the HW on the programer and the CH stays on(on the programmer)..thanks

then there is a problem with the hot water off signal from the programmer,
you may also have a problem with the cyl thermostat too! but thats easy to sort (just a replacement) as its wired correctly and the valve is working
but you definately have a problem with the programmer hot water off connection to the valve grey, as mandate has said it may have been omited

There 2 reasons why this happens.
1.The valve may be moving to CH position, but a faulty micro switch will stop boiler from lighting. (change actuator head)

Mandate its not the actuator as it moves to CH and fires the boiler (see up to the last post on first page)

Matt

 

[sellyservice]

Hi
last night , took the lid off the valve cover and moved the valve into the middle postion and all night we had hot water and red hot heating..first time ever..

 

[MANDATE]

The valve operation depends on:
Firstly the room stat gives power to the valves white wire which drives the valve to mid point.
Secondly for the valve to move (if need be) power has to be applied to the valves 'grey' wire.
When HW and CH are both on, valve takes up mid position for a short time until either CH or HW is satisfied.

Say HW becomes satisfied, the cylinder stat stops feeding power to boiler and diverts it to the grey wire of the valve. This moves the valve onwards and also uses a micro switch to restore power to light the boiler again.
This action can only take place in this situation providing there is a wire from cylinder stat (satisfied terminal) to the grey wire.
Now suppose HW was never switched on! well it couldn't work if no power went to the stat, so it presents a problem.
The problem gets resolved by installing a alternative wire from the programmer (HW OFF terminal) ,so it still works when HW is off.

What I'm thinking may have happened here is the HW OFF wire is missing (or faulty)but the wire from cylinder stat to grey wire of valve is there.

This would mean the valve could go to CH only providing the HW is on and satisfied.
If the HW was off and only CH selected then valve would go to mid position and no further if there is no power to the grey wire.

If you turn both HW and CH off, the grey wire in the junction box should be 'live' if the HW OFF wire is present.
Are you in a position to check it?

 

[sellyservice]

Hi yes can check, do you mean the grey wire at the Valve above the bolier and should it be 240v live..can check no problem..thanks for taking time to help

 

[MANDATE]

The mid position valve will have a flex containing 5 wires, the 'grey' being the one directly related to the wire from the programmer HW OFF terminal.
If you can identify it in the actuator head and access it,then check it there.
If not you may have to go to your'10 terminal junction box.
Yes it should 240v