In article , fred writes
In article , David Williams
writes
Had a look inside and reseated the two
connectors onto the PCB (one was loose) and guess what, it now works fine...
same heat on setting 3 as previously on setting 6 so twice the flow. The
engineer couldn't have seated the connectors properly when he replaced the
board.

A quick followup, those spades are carrying quite a bit of current, so you
might want to gently re-tension the contacts if they are the slightest bit
loose; to avoid more trouble later.
--
fred