I have had this controller for many years and it has worked well.
I moved 2 years ago and boxed it up. When I try to use it, I get Fr in the display.
If I unplug it, hold the Set button till I plug it in (then release the Set button) and before it displays the Fr code I press the increase button I get the following:
a) Fr is displayed in PV
b) 210 is displayed in SV
c) work 1 light comes on
After 5 seconds the Fr is displayed.
If I press the decrease button (instead of the increase), I get the following:
a) 21.2 C is displayed in PV
b) 210 is displayed in SV
c) work 2 light comes on
Again after 5 seconds the Fr is displayed.
What does the Fr code mean?
Thanks!