Recent content by spshannon

It is the Overheat LED - the one above the thermostat knob. The thermostat knob position is set to 4. I have tried taking it lower and higher (but not to max. & min. settings) but this did not seem to make any difference. There is one other indicator that behaves strangely. The water...

Not consistently, but this may fit a pattern. I guess it depends much on the ambient temperature, but now I think about it there is often a lock out about half an hour after it has has been off for a period of time. We usually have HW & CH on together but I think it locks out on either.

Yes, the pump is wired to the boiler. I can't see enough (nor know enough) to be sure about zone valves. I should say that this is a boiler installation in a new house built in 2001. The system has run without trouble for 6+ years. Judging by some of the other comments I've seen, could...

The first few times we got an 'Overheat Lockout' it was traced to low water pressure and was easily rectified by topping up the water in the system. Now we are experiencing 'Overheat Lockout' more frequently. It is easily cleared but I can't understand what is causing the problem - sometimes...