I have a Potterton Netaheat Profile and a Honeywell thingamy whatsit that controls everything. It all appeared to work fine but the water got very hot, so I replaced the tank thermostat which was the obvious answer at the time but nothing changed. Could it be a second faulty stat or something more sinister. Even when the stat is set to zero the water is still scolding, the boiler is not going constantly which I presume is due to its own internal thermostat........Any advise is gratefully received.
