72
SERVICING
Air conditioner/heat
pump may appear to be
operating nor mally.
Compressor protector
may be open (compressor
and outdoor f
Integrated control
module diagnostic/status
LED displ ay sho ws the
indicated code .
H
8
High Line
Voltage
VO LT
08
High line
voltage
Correct high line
voltage condition;
contact local utility
if needed.
Ve rify unit is
connected to po wer
on rating plate .
Turn power OFF pr ior
to repai r.
Control detects line
voltage greater than
255 VAC.
Fault will clear if line
voltage decreases
below 255 VAC.
Air conditioner/heat
pump may appear to be
operating nor mally.
Integrated control
module diagnostic/status
LED displ ay sho ws the
indicated code .
0
9
Low Pilot
Voltage
LO W
VO LT
09
Control detects
secondar y
voltage less
than 18 VAC.
Transf ormer
overloaded.
Low line voltage.
Chec k fuse .
Correct lo w second -
ary voltage condition.
Chec k transf ormer;
replace if needed.
Turn power OFF pr ior to
repair.
Fault will clear if
secondar y voltage r ises
above 21V AC.
Replace with correct
replacement par t(s).
.
Integrated control
module diagnostic/status
LED displ ay sho ws the
indicated code .
P
0
Comp
Protector
Open
displayed displayed through run or
star t windings.
Compressor
run winding is
open.
Compressor not
properly wired to
control.
Faulty
compressor
wiring.
Failed
compressor r un
capacito r.
Faulty r un
capacitor wi ring.
Chec k compressor ;
repair/replace as
needed.
Chec k wiring; repair/
replace as needed.
Chec k run ca -
pacitor; replace as
needed.
Turn power OFF pr ior
to repai r.
Fault will clear after 1
normal cycle .
Fault ma y be cleared
by cycling 24V AC to
control.
Replace with correct
replacement par t(s).
Air conditioner/heat
pump may appear to be
operating nor mally.
Compressor protector
may be open (compressor
and outdoor f
Integrated control
module diagnostic/status
LED displ ay sho ws the
indicated code .
0
8
VO LTAG E
08
Chec k circuit
break er and fuses .
Ve rify unit is con -
nected to po wer
on rating plate .
Turn power OFF pr ior
to repair.
Control detects line
voltage less than
185 VAC.
Fault will clear if line
voltage increases
above 185 VAC.
Digit 1
Digit 2
Digit 3
ADDITIONAL NOTES FOR UNITARY CONTROLS
1. When system is at Standby mode Press "TEST" push button to turn on both the compressor and outdoor fan for (5) five
seconds.
2. The "RECALL" push button is used to retrieve the (6) six most recent faults. The control must be in Standby Mode (no
thermostat inputs) to use the feature. Depress the push button for approximately two seconds and less than five seconds. The
7-segment LED displays will then display the (6) six most recent fault and decrementing to the least recent fault.
3. The faults may be cleared by depressing the button for greater than (5) five seconds.
4. Consecutively repeated faults are displayed a maximum of (3) three times. Refer to the fault code definitions at the end of this
manual for more details.
5. A forced defrost can be initiated by pressing "TEST" and "RECALL" push buttons simultaneously for more than 1 second with a
valid call for heat. The forced defrost can be terminated by a (10) ten minute lapse in time, a coil temperature rise above 75°F
or by pressing the two buttons again for more than 1 second.
6. "TERM" dip switch is used for communications bus configuration. Leave the settings to the factory default position. Rarely do
the "TERM" dip switch settings need to be changed.
7. "LEARN" push button is used to reset the communications between the equipment. Used only for troubleshooting purposes.
