My potterton promax 15he is not cycling - the burner remains on for hours until eventually it locksout, I guess because it overheats.
The bolier responds correctly to the room and water thermostats, and seem to respond to the various sensors in that it shuts off when they are disconnected.
Is this likely to be a faulty flow temperature thermister? It measures 10k ohms cold and drops to 250 ohns when hot which seems to be ok, disconnecting it does shut off the burner.
Any other suggestions?
Thanks
The bolier responds correctly to the room and water thermostats, and seem to respond to the various sensors in that it shuts off when they are disconnected.
Is this likely to be a faulty flow temperature thermister? It measures 10k ohms cold and drops to 250 ohns when hot which seems to be ok, disconnecting it does shut off the burner.
Any other suggestions?
Thanks