Johnson Controls R SERIES Installation And Maintenance Manual page 63

PU Charging circuit error
Yes
Replace the
mainboard
ee driving board chip error
ee is displayed
on the wired
Replace the
Works Normally
PU is displayed on
wired zone
controller
PU is displayed in
the mainboard 88
indicating light
Is the PFC wire
tightened or is the
sequence right?
Works normally
controller
Yes
Is the
Yes
jumper
loose
No
mainboard
55
No
Tighten the PFC
wire or adjust the
sequence
Tighten the
jumper