wrote in message
ups.com...

It is printed on the block that it's 25 ohms and that is what I am
getting.
I will have a look again and see if I can find the thermostat. There is
a dial
on the front panel that controls the temperature " 1 to 5" but I
presumed this was just another variable resistor. I'm afraid the owners
manual is not very helpful.

Never seen an electronic one. It should be a mechanical thermostat. I'd take
a look at that - see if something is damaged. Also, if you have a 'hot'
light there should be another 'stat somewhere IMO.
--
N