Troubleshooting - cooling mode, Diagnostic display, Instrumentation – Reznor R6GI Unit Installation Manual User Manual

Page 24: Low ambient cooling, Troubleshooting - heating mode, Troubleshooting - cooling mode diagnostic display

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Table 8

Table 7

DISPLAY

CODE

INDICATION

01

Inverter Power Module Overcurrent

02

General Inverter Drive Fault

03

High Compressor Current

04

Current Sampling Error (Inverter)

05

High Inverter Heat Sink Temperature

06

High DC Bus Voltage (Inverter)

07

Low DC Bus Voltage (Inverter)

08

Low Line Voltage at Inverter

09

Line Overcurrent at Inverter

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

Override, High Line Current

17

Override, High Inverter Heat Sink Temp

18

Outdoor Fan Motor Fault

19

Low Pressure Switch Open

20

High Compressor Discharge Temperature

21

Interface Board Software Error

22

Sensor Failure - Suction Line Temperature

23

Sensor Failure - Compressor Discharge Temperature

24

Sensor Failure - Ambient Temperature

25

Sensor Failure - Coil Temp #1, Defrost

26

Sensor Failure - Suction Pressure Transducer

27

Blower Motor Fault

28

Blower Communication Fault

29

Cooling Low Ambient Lockout

Table 7.

Interface Board Diagnostic Codes

TROUBLESHOOTING - COOLING MODE

Diagnostic Display

The interface board located inside the control panel has a
two character display which provides information regarding
operational status and fault history. When 24VAC control
power is provided to the board, the display will show some
combination of characters. In order to diagnose a problem
with the unit, or to determine its operational status, remove
the control panel cover, then observe the 2-character
lighted display on the interface board. Refer to

Table 7

.

The display will alternate between an operating code as
shown in

Table 17, (page 31)

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 20

.

FUNCTION

TYPE

CONNECTION

High Pressure

Switch

Opens 650 ±15 psig,

recloses 460 ±15 psig

See

Figure 8

&

Figure 9

Low Pressure

Switch

Opens 20 ±5 psig,

recloses 35 ±5 psig

IFB* LP1-LP2

Ambient

Air Temp

Thermistor 10KΩ

@

25° C (Fig. 10)

IFB* “OUTDOOR TEMP”

(BLK)

Compressor

Discharge Temp

Thermistor 10KΩ

@

25° C (Fig. 10)

IFB* “DISCHARGE

TEMP” (RED)

Coil Saturation

Temp

Thermistor 10KΩ

@

25° C (Fig. 10)

IFB* “COIL #2

TEMP” (YEL)

Suction

Temp

Thermistor 10KΩ

@

25° C (Fig. 10)

IFB* “SUCTION TEMP”

(BLU)

*IFB=Interface Board

Table 8. Instrumentation List

TROUBLESHOOTING - HEATING MODE

If the furnace fails to operate check the following:

• Is the thermostat operating properly?

• Are the blower compartment door(s) in place?

• Is the furnace disconnect closed?

• Has the circuit breaker tripped or the control board fuse

burned open?

• Is the gas turned on?

• Are any manual reset switches open?

• Is the filter dirty or plugged?

• Is the flame sensor coated? (Remove and clean with

steel wool. Do not use emery cloth or sandpaper!)

• Are all the LED’s on the furnace and motor control

boards constantly ON? If not, refer to

Table 9

&

Table

10, (page 25)

to determine fault condition.

IMPORTANT NOTE:

The furnace will lock out after 5 failed attempts for

ignition and will try again every hour if the call for

heat remains.

Instrumentation

The 20 SEER iQ Drive split air conditioner includes
instrumentation as listed in Table 8. All items listed
are connected to the interface board except for the
high pressure switch. Refer to

Figure 12 (page 30)

&

Figure 13 (page 30)

,

Figure 14 (page 31)

,

Figure 15

(page 32)

,

Figure 17 (page 34)

&

Figure 18 (page

35)

. 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 23 (page

39)

for troubleshooting purposes. The charts show the

thermistor resistance-temperature curve broken into two
parts for ease of use.

Low Ambient Cooling

System control will modulate to allow safe operation in
low outdoor temperatures by controlling blower CFM,
compressor speed, and fan speed until an outdoor
temperature is less than 50

0

F. Unit is then disabled and

remains locked out until temperature has increased to

55

0

F. Code 29 is displayed to indicate low cooling lockout.

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