this is my problem i think.couldnt get enough heat for downstairs,changed thermostats and ch sensor.closed off top rads,now getting warm.but i got the exact same problem as you.not hot enough for all,keeps cuttting out.
i am thinking factory 90" reset has changed but dont know where this one is. i got a heatline and wondered if you solved your problem. thanks
paul tracey
October 2012