We have a problem with our heating, we think it started after we bled some radiators and took one off to wash threw. The rads downstairs are not getting hot, the rads nearest to the boiler appear to get hotter. We have hot a plumber out four times and he has not found the problem. He has bled the rads, balanced the rads, changed the pump, changed loads aof thermo valves on the rads, drained the system and refilled (never did a power wash as the rads were not really that dirty and never saw any sludge). We have since tried turning the honeywell motorised head valves onto manual and the heating kicks in for a couple of minutes then switches back toi auto again, what are the possible causes of this?

Jue, January 2011

Further update, I have turned the hallway thermostat upto high and the honey well motorised valves onto auto, the boiler kicked in and started to fill the rads, then before the hallway rad warmed up, the valve closed again. I had someone hold a cold air hairdryer near the hallway thermo to see if it sent a message back to the boiler to open the valve again, but it didnt open, which is faulty the motorised valve or the hallway thermostat on the wall?

Jue, January 2011