getting lost in randall controler and glowworm system

[purchas1971]

quick run down is

glowworm back boiler about 10-15yr old

programmer lost power found to be fuse..replaced fuse getting hotwater again - however heating wouldnt come through, boiler firing on water cycle. the programmer sounded diffrent when i pressed +1 on heating compared to water so ive replaced the 922 programmer with a new fp975..ive checked al the wiring and setting switches twice. i am still getting it to fire and supply hot water but cannot get any heating..

any ideas please..

oh and i cant get to the pump as its under the floor but i think its working as i am getting the hotwater up to the tank.

thanks

 

[seco services]

is it a fully pumped system or gravity hot water pumped heating.

 

[purchas1971]

i think its a fully pumped..

is there an easy way to tell the diffrence?

sorry im a numpty with heating

 

[seco services]

do you have any valves like these

wheres the pump ? under what floor ?

 

[purchas1971]

i belive its under the living room floor -- allthought ive never taken the complete floor up to find it...

i thought it could be the mv but cant seem to find it --would it be located by the pump?....i was hoping it would be something i could fix without ripping the floor up.

 

[seco services]

have known them to be under the floor as well as the pump.

sonnds like a gravity hw pumped heating system.

 

[purchas1971]

so it could be the pum or the mv then?

damm.. looks like its a floor up job to try and find it

 

[seco services]

have you set the switchs on the back correct ?

 

[purchas1971]

ive got it set for 5/2

unlinked and mk9 as i copied the wiring from the old 922 programmer

 

[seco services]

i suspect your is gravity hw so would need to be in gravity linked.

 

[purchas1971]

just tried that it lights up on both sides but heating still doesnt work just had a look at the old control and that was unlinked aswell

 

[purchas1971]

oh and cheers for all this advice aswell

 

[seco services]

i would check the rest of the wiring ie pump etc