My boiler started playing up last week. The plumber/heating engineer came and said it's the pump that's not working. He switched off the pump or removed it, I don't remember but he got the boiler working again and said it would okay for a few days until he could come back to replace it which was meant to be tomorrow! He's now said it will have to be after Christmas. Do you think the boiler should be okay or am I best not using it at all? TIA