hot water but no heating

[chippy plumbob]

Hi all

Having some problems with my combi boiler ariston microgenus. Not too fimiliar with boilers reason why im here so pls help. I turn the hot water tap on ignites my boiler and gives me hot water everytime however trying to start the heating is a different story. After resetting the boiler it fires up the heating to max cause thats where ive set the main temp guage on the control panel to, pipes get real hot then after about a minute or 2 it just dies down. Ive just installed a new thermostat with new cable to the existing 2 core low voltage wire from the main control panel and I move the dial and still no heating. Now ive tried swiching it onto constant - doesnt work, timer on with timer set to present - doesnt work and the only one it works with is off! haha. Please help any ideas would be greatly app. By the way Ive removed all the rads bar 1 and both valves are opened, been bled and sitting at 1.5 bar. The boiler hasnt been used for about 3 yrs so maybe somethings blocked inside and not sure i thermo worked previously.

 

[sonray ltd]

you say the pipes get really hot and then dies down.

what pipes are getting hot ?
how far are they getting hot ?

 

[chippy plumbob]

Thanks for the reply. I have one rad in the house so it heats up nice and hot but thats only when its been reset, after that it just dies down and boiler will sparks up for like 3-5 seconds every 5-10 mins. could it be my control panel playing up? should I try and connect a new timer/switch to the back of the control panel to check if its that? Ive also disconnected the thermo as well to rule that one out.

 

[sonray ltd]

the pump is running on heating ?

 

[chippy plumbob]

wot do you mean by pump running on heating? thanks

 

[sonray ltd]

pump inside the boiler behind the cover

http://www.plumbnation.co.uk/site/a...-boiler-natural-gas/Ariston Microgenus HE.pdf

have you tried shutting the hot rad and leaving others open ?

 

[chippy plumbob]

pump inside the boiler behind the cover

[DLMURL]http://www.plumbnation.co.uk/site/ariston-microgenus-28he-combination-boiler-natural-gas/Ariston%20Microgenus%20HE.pdf[/DLMURL]

I have the end user manual for mine, its says its a micro 23 or 27 mffi . ive opened the cover up. Ive reset it and had it on on, had it on timer with the timer set to present time and had it on off. sorry if im missing something let me know if i am