No and No.

All he should have done was to have checked to see if the new boiler fired up.

The gas pressure and the fitting of the radiators should only have been checked if you had asked him AND PAID HIM to do that.

It's not his job to check you whole system or your whole house unless that's what you ask him to do.

Case in point.

I installed a new water heater for a customer. Because he wanted a larger one I had to break into the chimney higher up. On doing this I discovered that the original installation was incorrect and that flue gasses were being piped into his house.

I pointed this out and asked him if I should fix it for him or did he want to do it hisself or get someone else to fix it.

He said go ahead and fix it. This required making up a speciallly designed flue section to bypass the problem area and direct the gasses up the chimney.

When he got the bill he complained that it was too high and that installing a water heater should not cost that much.

The fact that we had protected his family from carbon monoxide poisoning didn't cross his mind.

Also if we had just replaced the heater with one the same size we would never have seen the problem. Of course by your logic that would have been OUR fault.