can't you email him? or text him?
its annoying when people go AWOL, but sometimes there are good reasons...
If he does not answer my several phone calls at different times of the day and also leaving messages on his answer phone, I doubt he would respond to text or email.
Yes and as I in my reply to bazdaman earlier, having think back to what was said, I think he felt the job to replace the part quite fiddly and he would prefer something more straight forward like servicing/cleaning the boiler and getting paid rather than doing a more involved job and getting paid about the same per hour. i suspect that would be the only reason ! People these days are looking for making an easy buck instead of having pride in thier job or have personal moral principles. In my past job, its called having the meat and leaving the bones to others !