Daikin ComfortNet DX7TC Service Instructions Manual page 72

SERVICING
Digit 3
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 .
Air conditioner/heat
pump may appear to be
operating nor mally.
Integrated control
module diagnostic/status
LED displ ay sho ws the
indicated code .
.
Integrated control
module diagnostic/status
LED displ ay sho ws the
indicated code .
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 .
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.
72
Digit 2 Digit 1
H 8 High Line
Voltage
0 9 Low Pilot
Voltage
P 0 Comp
Protector
Open
0 8
08 High line
VO LT voltage
LO W 09 Control detects
secondar y
VO LT voltage less
than 18 VAC.
Tr ansf ormer
overloaded.
Low line voltage.
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.
08
VO LTAG E
Correct high line Tu rn power OFF pr ior
voltage condition; to repai r.
contact local utility Control detects line
if needed. voltage greater than
Ve rify unit is 255 VAC.
connected to po wer Fault will clear if line
voltage decreases
on rating plate . below 255 VAC.
Chec k fuse . Turn power OFF pr ior to
Correct lo w second - repair.
ary voltage condition. Fault will clear if
Chec k transf ormer; secondar y voltage r ises
replace if needed. above 21V AC.
Replace with correct
replacement par t(s).
Chec k compressor ; Tu rn power OFF pr ior
repair/replace as to repai r.
needed. Fault will clear after 1
Chec k wiring; repair/ normal cycle .
replace as needed. Fault ma y be cleared
Chec k r un ca - by cycling 24V AC to
pacitor; replace as control.
needed. Replace with correct
replacement par t(s).
Chec k circuit Tu rn power OFF pr ior
break er and fuses . to repair.
Ve rify unit is con - Control detects line
nected to po wer voltage less than
185 VAC.
on rating plate . Fault will clear if line
voltage increases
above 185 VAC.