Worcester greenstar junior - no heating but hot water?

[baconsandwitch]

I have an Worcester greenstar junior it seems that the mt10 timer has given up..... I have hot water but no heating, the green light comes on for about 30 seconds and then turns off, I'm hoping these are related issues. is there a way of by passing the timer to test this? or any other way of testing this?
I have turned bled all the radiators,
pressure is 1.5 bar
I have reset the boiler
turned it off and on again.
now run out of ideas.

If I install a nest/hive system, do I need to replace the timer as well? this may be a silly question... but I've been up since 4am with a crying child.

 

[CBW]

Sounds like it could be a diverter motor issue. However the MT10 timer - in what sense has it given up?

 

[baconsandwitch]

that sounds expensive... thanks ill do some googling. the MT10, the clock doesn't work, and the switch doesn't seem to do anything between off, clock and on

 

[CBW]

Try putting it on the clock setting and push all the pins in, make sure the thermostat is set high enough too. As for the expense - it’s a matter of whether you have heating. Can’t see it being that expensive. As for Nest/Hive - either would work, as would many others, although Nest requires existing wiring for the thermostat or to be plugged into a socket. Removing the MT10 requires removing the boiler casing and must only be done by a competent person able to check for safety afterwards.

 

[amcluesent]

A Nest would replace the MT10, the Nest HeatLink has output to request central heating from the Combi

 

[baconsandwitch]

ah okay, just had a google, that's not as bad as I expected. I think id get both done at the same time better safe than sorry and all that. thanks both.

 

[Madrab]

If the clock doesn't work (does it actually advance in time?), that may be what is interfering with the CH not running. The timeclock is the 'interlink' that controls the central heating, if that isn't making the internal connection then the boiler won't fire in CH mode.

The bypass would be performed inside the boiler and as suggested that's really an engineers territory, especially if you have little ones. It is a relatively quick and easy test mind you.

 

[baconsandwitch]

no, the time clock doesn't advance in time. so that would make sense.

ideal thank you

 

[CBW]

Did you try my suggestion of pushing all the pins in?

 

[baconsandwitch]

Hey, sorry for taking ages to get back. Yeah I tried the pins.

 

[CBW]

Had anyone out to it yet? I take it the pins in didn’t work then?

 

[baconsandwitch]

Not had anyone out yet, been away all week on work. Yeah the pins didn’t work. Thanks for the ideas though

 

[kidgreen61]

Those clocks are prone to fail, and they're quite expensive to replace, you'd probably be better off just replacing it with a wireless prog stat, and disconnecting the existing clock.
If you're not confident, get someone to do it for you, it's a 20 min job.