No central heating or hot water (with pics)

Gasguru · 6 Sep 2006

The motor in the valve head may have failed. Remove lid of valve and check power to motor. With heating only selected the motor should wind the valve fully to open the heating port A and then power the boiler/pump with the microswitches inside the valve head.

Alternatively the system may not be wired correctly and you may need to set the hot water on, on the timeclock.

holty69 · 6 Sep 2006

Gasguru

At the moment both the water and CH are selected.

I'll change it to be CH only and see if it changes. If not i'll take a look in the 3 port valve.

thanks

holty69 · 6 Sep 2006

ok - back - just moved the slider up to 'Man Open' and it stayed there. Th epump isn't going yet, should it kick in soon?

ChrisR · 7 Sep 2006

When you put the CH on, the lever on the end of the 3 port should go floppy - does it? If not, wiring or valve/motor is faulty.
Moving the lever to the man position doesn't turn the pump on. If you push it really hard it overshoots and you hear the pump come on for a second or so. The motor should be taking the mechanism past that point.

holty69 · 7 Sep 2006

Chris - how do you mean 'floppy' - i'm able to move it upwards....

just a quick update of what i noticed this morning:-

Had no CH or Water on over night.

Tried tap and hot water was still there.

Switched CH only on in the programmer, no fireing up noise from the boiler and the pump not running.

Switched CH back off

Switched Water on, heard boiler fire up instantly.

Switched Water off

Switched CH on via timer to come on and it fired up perfectly, pump running etc. Although after 30 mins the rads where still stone cold.

Do you think i have a dodgy programmer? any ideas why the rads didn't come on after 30 mins - do you think they need a little longer as they havent been on since April?

ChrisR · 7 Sep 2006

SOunds like a wiring error, (or maybe a faulty microswitch in the valve head)
Check that there's a connection to the HW OFF terminal in the programmer, and that there are 3 wires going to the cylinder stat, excluding any earth - unless it has been used for a signal wire!
Check all the connections:
http://content.honeywell.com/uk/homes/Catalogue/Sundial Plans/3.4 Y Plan.pdf

holty69 · 7 Sep 2006

Cheers Chris - i'll take off the programmer tonight and see whats going on!

holty69 · 7 Sep 2006

I think i might actually get a new programmer as the one i have is horrible - looks about 20 years old.

I might go for the Honeywell ST6400C - is this a good one?

first i'll get the CH working (hopefully) on the current one.

holty69 · 7 Sep 2006

actually this is the newer version of my programmer - http://www.plumbworld.co.uk/763-16645

fitz1 · 7 Sep 2006

you dont happen to have an immersion heater turned on.

holty69 · 8 Sep 2006

you dont happen to have an immersion heater turned on.

I don't think so - is there anyway that I can check? I don't know of a way to switch it on (havent seen a switch for it)

Didnt have time last night to check the programmer wiring, so will do that tonight

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No central heating or hot water (with pics)

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