DIY Doctor UK DIY Forums

Hi all

Having some problems with my combi boiler ariston microgenius. Turning 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.

from what you say the boiler is working ok well at least 90% apart from the heating thermistor could be at fault
another thing it could be a circulation problem and could be a blockage it might be worthwhile draining and disconnecting and checking if there is any sludge about

Did the boiler work ok before you fitted the stat ?

htg

To htg....Not sure really, dont think so. Just refurbing the property so first thing i did was take the rads off. I would have to say no. Thanks for the reply too

and to To gasmick...when you say heat thermistor I take it you dont mean the wall thermostat? And have drained the system many times pressure in the heating had to be up for the boiler to even produce hot water so no real problem there but when you say dissconnect do you mean the pump? thanks again for you patience

thanks for your post. When you say heat thermistor I take it you dont mean the thermostat? Ive drained it many of times cause id take a rad off then had to repressurize the system to get the hot water working again so its been drained many times. any ideas?

To gasmick...when you say heat thermistor I take it you dont mean the wall thermostat? And have drained the system many times pressure in the heating had to be up for the boiler to even produce hot water so no real problem there but when you say dissconnect do you mean the pump? thanks again for you patience