My heating is split into 3 zones - upstairs, downstairs, hot water.
All was ok until the other morning when the upstairs heating didn't come on as normal.
When I turn it on nothing happens. The boiler doesn't kick in. The light comes on the timer but thats all. But everything is fine with downstairs heating and hot water.
The oil was fairly low until I got a fill on Monday. If it got too low while the upstairs heating was trying to kick in(or was on) would this have resulted in an air lock?
Or would an air lock have occured between oil tank and boiler thus not allowing any heating to work.
What is the likely cause?
Any opinions appreciated. Thanks.