Service manual

12-2
TROUBLESHOOTING
SM HADDCI 1-A.2 GB
No SYMPTOM
PROBABLE
CAUSE
CORRECTIVE ACTION
8 Compressor is on but
outdoor fan does not work
Problem with outdoor
electronics or outdoor
fan
Check outdoor fan motor according
to the procedure in section 15.1.5.3
below, if not OK replace controller
9 Unit works in wrong mode
(cool instead of heat or
heat instead of cool)
Electronics or power
connection to RV
Check RV power connections, if OK,
Check RV operation with direct
230VAC power supply, if OK,
Replace outdoor controller.
10 All components are
operating properly but no
cooling or no heating
Refrigerant leak Check refrigeration system.
11 Compressor is over heated
and unit does not generate
capacity
EEV problem Check EEV
12 Units goes into protections
and compressor is stopped
with no clear reason
Control problem or
refrigeration system
problem
Perform diagnostics (See 15.1.3 below),
and follow the actions described.
13 Compressor motor is
generating noise and no
suction occurs
Phase order to
compressor is wrong
Check compressor phase order.
14 Water leakage from indoor
unit
Indoor unit drainage
tube is blocked
Check and open drainage tube.
15 Freezing of outdoor unit in
heat mode and outdoor unit
base is blocked with ice
Connect base heater.
16 Unit operates with wrong
fan speeds or wrong
frequency
Wrong jumper
settings
Perform diagnostics (See 15.1.3 below),
and check if units is operating by
EEPROM parameters.
12.1.2 Checking the refrigeration system
Checking system pressures and other thermodynamic measures should be done when system
is in Test Mode (in Test mode, system operates in fixed settings). The performance curves
given in this manual are given for unit performance in test mode when high indoor fan speed is
selected.
Entering test mode:
Set unit to Cool/16 degrees/High indoor fan speed, or Heat/30 degrees/High indoor fan speed,
and enter diagnostics.
12.1.3 Judgment by Indoor/Outdoor Unit Diagnostics
Enter diagnostics mode - press for five seconds Mode/Reset button in any operation mode.
Acknowledgment is by 3 short beeps and lights of all Display LED’s. Then, The units will enter
into Indoor and Outdoor unit diagnostic modes.
During the Outdoor unit diagnostics all three Indoor LED’s (STBY/Operate, Filter and Timer)
are blinking. When Indoor diagnostics is displayed, all three LED’s (STBY/Operate, Filter and
Timer) are ON.
When system enters diagnostics mode, only one fault code is shown. Order of priority is from
the lower to the higher number. Diagnostics is continuously ON as long as power is ON. The
current system operation mode will not be changed.
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