3 Amp fuse on main board keeps burning out... HELP !!!

[Zeke2640]

I have a Janitrol 60,000 BTU 93% gas furnace, with a 2.5 ton AC that is about 10 yrs. old, and a Honeywell T8600D 2028 programable tstat, tstat is about 1yr old. recently the problem is that the little 3 amp fuse on the main board of the furnance keeps blowing, I have checked the tstat wires and everything looks ok, I tested the 24v transformer next to the main board and I get a reading of 26-27 volts across that. fuses lifespan is different some blow with-in 3-5 mins other last maybe an hour. Outside unit is clean tstat wires that go there are good, no cuts, the wires are twister together,not just
together with a wire nut. any ideas ? any help would be greatly appreicated.

thanks
Zeke

[mattison]

These can be a joy to find. A lot of the time it's the contactors coil in the outdoor unit going bad. You need to amp each one out to see what's drawing the over current.

[Zeke2640]

Thank You Mattison...

I got a new contactor for about $13 and installed it last night, the system
worked thru the night so I hope that fixed it...

Again thank you for the help..

Zeke