Hello, I have a model FSU2x2400A air handler and a condenser model
EQ71924434. The unit will run for a hour and a half and trip 5 amp
control fuse. the tstat was replaced the control board in air handler
was replaced. the defrost control board and coil temp sensor was
replaced the unit still trips fuse in a hour and a half. the unit
works well in heat mode cool mode and emergency heat
probly just a bad thermostat...
Still, suggest have a tek reset the defrost jumper to the 60 minutes
position and keep him on full time so he can sit there and replace the fuse
every hour on the hour--hint if you supply enough beer also have him piss on
the outdoors unit just prior the fuse replacement.
the unit was installed a year and half ago with no issues till now, a
new defost control board and coil temp sensor was replaced, the
reversing valve switches from heat to cool, I also believe it is
something to do with the defrost cycle. the unit had a older t-stat
replaced with a white rogers, replaced control board in air handler
also just trying to figure out what is going on, checked all wiring
continuity thought of a possible short, I guess the next thing would
be is check the charge, could be low causing coil temp sensor not to
make to let it go in defrost
Normally Id guess that but the OP said:
"the reversing valve switches from heat to cool"
If its shorted it wont switch. Ive been finding the wires from the LP
and HP switch and even the sensor touch the coppper and the vibration
of the unit rubs through the insulation.
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