Service manual

13-3
TROUBLESHOOTING
SM CINCO 1-A.1 GB
№ SYMPTOM / PROBLEM PROBABLE CAUSE CORRECTIVE ACTION
11 Compressor does not start
operation
One or some
components are not
operating well
Check for any fault code shown on display board and act
accordingly ( 13.4)
Electronics control
problem or protection
PFC Chock coil Check the PFC Chock coil ( 13.5.6)
Driver failure
Check if fault code #11, 18, 19 or 26 is shown on display
board. If so, fix the problem according to 13.5.5 or
replace driver (14.1.15.).
If still not OK Replace compressor (14.1.11.)
12 Cooling capacity is not
sufficient
Unit size not match the
load
Check if the size chosen for the complete room(s) load is
enough or need bigger units
Piping size not
matching system
Check if piping is installed correctly and proper diameter
size and total length is according to unit specifications
Refrigerant leakage
Check refrigeration system ( 13.3)
Refrigerant over-
charge
Refrigerant clog Check and repair clogging specially near the EEV
Electronics control
problem or protection
Check for any fault code shown on display board and act
accordingly ( 13.4)
Compressor failure
Check if fault code #11 or 26 is shown on display board.
If so, fix the problem according to 13.5.10 or replace
driver
Indoor coil block Clean filters and/or remove block or air by-pass
Indoor fan malfunction Check the motor and capacitor ( 13.5.19)
Outdoor coil block Remove block and/or avoid air by-pass
Outdoor fan malfunc-
tion
Check outdoor fan motors ( 13.5.9)
EEV malfunction Check EEV ( 13.5.12)
Thermistor(s) malfunc-
tion
Check if any of fault codes #1-10 is shown on display
board. Replace faulty thermistors (14.1.12.)
13 Heating capacity is not
sufficient
Check all according to above cooling problem ( 10)
Reverse valve Check reversing valve operation ( 13.5.11)
Deicing not
performed well
(during low outdoors
temperatures)
Check OCT and OAT thermistors fault codes (#1-2 and
7-8)
Check OCT thermistor if connected well to pipe
Check OAT thermistor if connected well
Check the thermistors operation ( 13.5.13)
14 Compressor is over heated
Electronic control
Check for any fault code shown on display board and act
accordingly ( 13.4)
EEV problem Check EEV (
13.5.12)
Refrigerant leakage Check refrigeration system ( 13.3)
Indoor coil block Clean filters and/or remove block
Indoor fan malfunction Check indoor fan motor and capacitor ( 13.5.19)
Outdoor coil block Remove block and/or avoid air by-pass
Outdoor fan malfunc-
tion
Check outdoor fan motors ( 13.5.9)
Compressor malfunc-
tion
Check the compressor ( 13.5.10)
15 Compressor stops many
times during operation
Check all according to above problem ( 12)
HP Switch
Check if HPS fault code (#8) is accruing frequently. If so,
check the switch operation ( 13.5.14)
LP Switch
Check if LPS fault code (#9) is accruing frequently. If so,
check the switch operation ( 13.5.15)
16 Not all units are operating Communication prob-
lems
Check the communication between outdoor and indoor
units ( 13.5.17)
17 Unit is cooling while in heat
mode
RV problem Check RV operation ( 13.5.11)
IDU-ODU communica-
tion
Check the communication between outdoor and indoor
units ( 13.5.17)