I Have a small external aircon / heating unit for a dog kennel.
It has stopped working, however I do get a transformer buzz (it made this noise when working too, inbetween cycles.)
Switching the master switch to either fan, heat or cool does not make any difference, still only the hum.
There are no other noises, clicks, clunks etc.
I have taken the casing off and cannot see any obvious internal damage or missing, burnt wires etc.
Any thoughts or suggestions would be very welcome.
Many thanks in advance for your help.
