i have a meggaflow system my heating is not working i have checked the preasure wich is fine and have bled all the rads. My boiler (A potterton suprima ) dosen,t seem to be fireing up at this time. please help its cold tonight kind regards spen

spen, October 2008

thanks for getting back to me so quickly iain. how will i know if the motorised valve is working? pump feels hot and seems to be running

spen, October 2008

system type?

does the boiler fire for hot water?

do you have a room thermostat?
is it calling for heat?
do you have power in power out of stat?

dont know what set up you have but if boiler fires for hot water when needed you know boiler is ok.
now you need to sequence out where power goes when you want ch.
do you get power into room stat from timer?
if yes do you get power out of stat to motorised valve?
is motorised valve doing anything? it may get power but may not motor over making end switch and firing pump/boiler.

8 out of 10 are motorised valve faults. does pump run?

iain, October 2008