Carrier Air 5 Manual

T-- 298 2-1
SECTION 2
TROUBLESHOOTING
For ducted units, the green operation indicator LED (SeeFigure 3-9) will flash if there is a problem.
Refer to Table 2--1 for diagnostic information.
SYMPTOM AND PROBABLE CAUSE
PROBABLE REMEDY
2.1 NO POWER TO UNIT
1. Master switch off
2. Open circuit breaker
3. Defective wiring
4. Loose electrical connections
5. Faulty switches, thermostat, or fan
6. 12 VDC not connected (Ducted System)
7. 12 VDC in-- line fuse open (Ducted)1. Reset master switch
2. Reset circuit...

T-- 2982-2 SYSTEM AND PROBABLE CAUSE
PROBABLE REMEDY
2.6 CYCLES ON COMPRESSOR OVERLOAD
1. Defective run capacitor
2. Defective compressor bearings or valves
3. Greatly restricted evaporator air, iced evaporator
coil.
4. Low refrigerant charge
5. Evaporator capillary restricted
6. Liquid line restricted
7. Compressor hot
8. Weak or inconsistent line power1. Replace capacitor -- Refer to Paragraph 3.5.8
2. Replace unit.
3. Defrost evaporator coil.
4. Replace unit.
5. Replace unit.
6. Replace unit.
7....

T-- 298 2-3 SYSTEM AND PROBABLE CAUSE
PROBABLE REMEDY
2.14 INADEQUATE HEAT (FREE -- BLOW HEAT ONLY)
1. No heat from heat strip.1. Verify AMP draw . ( 13.8 AMP)
Verify resistance through heating element. (9 OHM)
Check bi-- metal switch. If open, replace switch.
2.15 INADEQUATE HEAT (HEAT -- PUMP)
NOTE: Allow unit to operate 15 minutes after switch-
ing from cooling mode.
1. Reversing valve not operating
2. Outdoor coil icing.
1. Check for 115 volts at reversing valve coil
Check for reversing valve...

T-- 2982-4 Table 2--1 System Self--diagnostics Function (Ducted Remote)
Flashes
Error Codes
(Priority)
Error Contents
(Malfunction)
Display PatternAllowed Modes
21ROOM AIR THERM-
ISTOR FAILURE
3sec
.3sec
.
0.5 sec.
(Twice)FAN Mode
32INDOOR COIL
THERMISTOR FAIL-
URE
3sec
.3sec.
0.5 sec (3
Ti m e s )FAN Mode
FURNACE Mode
43OUTDOOR COIL
THERMISTOR
FAILURE
3sec.3sec
.
0.5 sec. (4
Ti m e s )FAN Mode
FURNACE Mode
54COMPRESSOR
DRIVE
MALFUNCTION
3sec
.3sec
.
0.5 sec. (5
Ti m e s )FAN Mode
FURNACE Mode...

T-- 298 3-1
SECTION 3
SERVICE AND MAINTENANCE
3.1 PREVENTATIVE MAINTENANCE
Cleaning-- Clean evaporator coil and condenser coil.
Hold flashlight behind coil to see if all spaces are clear.
Dust accumulation obstructs or reduces airflow and
results in loss of cooling capacity. Both coils may be
vacuumed when dry. Coils may also be brushed with a
stiff brush and then blown out with compressed air.
Thoroughly clean base pan, motors, fan wheels, and
other components.
Clean cover and ceiling grill. Mild...

T-- 2983-2 d. To replace the grill, place the grill up against the ceil-
ing panel and align the screw holes in the grill with the
ceiling panel.
e. Replace 4 screws.
Mounting
Screws
Figure 3-2 Ceiling Grill -- Free Blow
3.3.3 Ceiling Panel Removal
To remove the ceiling panel (Figure 3-3) do the
following:
a. Remove the ceiling grill. (Refer to paragraph 3.3.2.)
b. Remove 5 screws securing the duct plate to the ceil-
ing panel.
c. Remove 4 mounting bolts making sure to support the
weight of the ceiling...

T-- 298 3-3 3.3.6 Indoor Thermostat Removal
To remove the indoor thermostat (Figure 3-6) do the
following:
a. Remove ceiling grille. (Refer to paragraph 3.3.2.)
b. Remove 5 screws securing the control assembly
(item 3, Figure 1-3) to the control box cover.
c. Remove the indoor thermostat knob by grabbing the
outside edge of the knob and pulling it off of the ther-
mostat stem.
d.Remove 2 screws that secure the indoor thermostat to
the lower control box cover.
e. Carefully disconnect the 2 wires from the...

T-- 2983-4 3.4 CEILING UNIT -- DUCTED SYSTEMS
3.4.1 Filter Removal
The filters (Figure 3-9) are located in the ceiling grill. To
remove the filters, do the following:
a. Grasp the edge of the filter at recess in the end of the
ceiling grill.
b. Pull filter completely out of the filter slot.
c. Vacuum filter or wash filter in luke-- warm water.
Shake off excess water and dry thoroughly.
d. Replace filter by sliding the filter into the filter slot in
the ceiling grill until the filter frame is flush with...

T-- 298 3-5
115V AC
12V DC
Fuse
Upper Unit
ConnectorsFurnace
Wires (blue)
#1
#2
Figure 3-12 Control Box Assembly -- Ducted
3.4.4 Main PCB Board Removal
To remove the Main PCB board (Figure 3-13) do the
following:
a. Remove ceiling grill. Refer to paragraph 3.4.2.
b. Remove three screws securing the PCB cover to the
ducted ceiling unit.
c. Carefully turn over the PCB cover exposing the PCB
main and the PCB display assemblies.
d. Gently push holding clip away from PCB main assem-
bly.
e. Lift PCB main...

T-- 2983-6 3.5.2 Compressor Replacement
Observe the same procedures for rotary compressors
as for reciprocating compressors.
a. Follow all safety codes. Reminder: use protective
goggles, work gloves, and water soaked quenching
cloth.
b. Remove exterior cover. refer to paragraph 3.5.1. Dis-
connect all wiring from the compressor.
c. Apply field-- supplied, line-- tap-- valves to the suction
and discharge lines as close to the compressor as
possible.
d. Recover the refrigerant charge from the unit. After...