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DISPlaY
01
Inverter Power Module Overcurrent
02
03
04
05
High Inverter Heat Sink Temperature
06
07
08
09
10
Line Voltage Sampling Error (Inverter)
11
Loss of Communication (Inverter Internal)
12
Inverter Heat Sink Sensor Failure
13
Loss of Communication (Inverter Internal)
14
Loss of Communication (IFB to Inverter)
15
Override, High Compressor Current
16
17
Override, High Inverter Heat Sink Temp
18
19
20
High Compressor Discharge Temperature
21
22
Sensor Failure - Suction Line Temp
23
Sensor Failure - Compressor Dischg Temp
24
Sensor Failure - Ambient Temperature
25
Sensor Failure - Coil Temp #1, Defrost
26
Sensor Failure - Suction Pressure Transdcr
27
28
29
Table 6. Interface Board Diagnostic codes
The display will alternate between an operating code (Table
5) and a list of the codes for up to the last 20 different faults
or warnings. When this list is being displayed, each fault or
warning code in memory will be displayed for 5 seconds. If
one of the stored coded conditions occurs again, no repeat
entry will be made. Thus, the fault codes in the list are not
necessarily displayed in order of occurrence. Fault codes are
retained through loss of power. The fault code list in memory
can be cleared by shorting the J4 Test pins briefly when the
compressor is off. noTE: This action may also have other
consequences - See Delay Override on page 7.
Instrumentation
The 18 SEER iQ Drive split heat pump includes instrumentation
as listed in Table 7. All items listed are connected to the
interface board except for the high pressure switch. Refer
to Figures 2, 7, 8, and 9. The five temperature sensors are
color coded so that the color of the wire insulation matches
the color of the connector base on the left side of the circuit
board. All temperature sensors are 10k ohm thermistors. The
resistances of these sensors (when disconnected from the
interface board) may be checked against Figure 10 (page 15)
for troubleshooting purposes. Figure 10 shows the thermistor
resistance-temperature curve broken into two parts for ease
of use.
8
caPacITY STaGE
General Inverter Drive Fault
High Compressor Current
Current Sampling Error (Inverter)
High DC Bus Voltage (Inverter)
Low DC Bus Voltage (Inverter)
Low Line Voltage at Inverter
Line Overcurrent at Inverter
Override, High Line Current
Outdoor Fan Motor Fault
Low Pressure Switch Open
Interface Board Software Error
Blower Motor Fault
Blower Communication Fault
Cooling Low Temp Lockout
FuncTIon
TYPE
High Pressure
Opens 650 ±15 psig,
Switch
recloses 460 ±15 psig
Low Pressure
Opens 20 ±5 psig,
Switch
recloses 35 ±5 psig
Thermistor 10KΩ @
Ambient
Air Temp
25° C (Fig. 10)
Thermistor 10KΩ @
Compressor
Discharge Temp
25° C (Fig. 10)
Thermistor 10KΩ @
Coil Defrost
Temp
25° C (Fig. 10)
Thermistor 10KΩ @
Coil Saturation
Temp
25° C (Fig. 10)
Thermistor 10KΩ @
Suction
Temp
25° C (Fig. 10)
*IFB=Interface Board
Table 7. Instrumentation list
MaInTEnancE
WarnInG:
ElEcTrIcal SHocK, FIrE or EXPloSIon
HaZarD
Failure to follow safety warnings exactly could result
in serious injury or property damage.
Improper servicing could result in dangerous
operation, serious injury, death or property damage.
• Before servicing, disconnect all electrical power
to the equipment.
• When servicing controls, label all wires prior to
disconnecting. reconnect wires correctly.
• Verify proper operation after servicing.
• Inspect the indoor air filter monthly. Clean or replace it
at the start of each heating and cooling season or when
an accumulation of dust or dirt is visible. If the indoor coil
needs to be cleaned, contact a qualified service technician.
• Inspect the condensate disposal line from the indoor coil
at the beginning of the cooling season to make sure it is
not obstructed.
• Remove any leaves, grass clippings, and debris from the
outdoor unit coil, being careful not to damage the aluminum
fins. Dirt may be cleared from the coil by using a water
hose directed through the discharge fan grille toward the
outside of the unit.
• Have a yearly inspection by a qualified service technician
to ensure that the system is performing at its optimum level.
• At least once a season open the control panel (with power
off) to inspect for and clear out insect structures and/or
cobwebs which might impede airflow through the control
panel compartment and the air inlet louvers at the bottom
of the control compartment.
connEcTIon
See Figures 8 & 9
IFB* LP1-LP2
IFB* "OUTDOOR TEMP"
(BLK)
IFB* "DISCHARGE TEMP"
(RED)
IFB* "COIL #1 TEMP"
(WHT)
IFB* "COIL #2 TEMP"
(YEL)
IFB* "SUCTION TEMP"
(BLU)
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