Grandaire 4860 - Page 29

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F3/P5 (condensor coil temperature(T3) protection in cooling)
Diagnosis Handling
Yes
Check whether T3/T5 are
normal according to Table 1
and Table 2
Check whether T3 are normal
according to Table 1
Yes
Check whether outdoor unit
motor is abnormal and whether
the outdoor condenser coil is
blocked
No
Check whether there's short
circuit in air outlet and inlet side
when the ambient temp. is high
Yes
Restart to check whether
there’s the same fault
No
Replace sensors
Replace sensors
No
Replace the fan and
remove all the barriers
Yes
Keep operating
No
No
Check refrigerant according
to charge mode
Adjust refrigerant charge
No
Replace installation position
or rectify the surrounding
goods to avoid air return short
circuit
Yes
Replace the main control
board
Yes
C4/C3 (T3 sensor is seated fault in cooling)
Diagnosis Handling
Check whether the T3 sensor
is seated to the condenser coil
No
Check whether T3/T4 sensors
and high pressure switch are
connected according to wiring
diagram
Yes
Check whether there’re other
heat sources around T3/T4
No
Check whether high pressure
switch(HPS) is in fault(CLOSE
is normal), whether the fan
doesn’t operate
No
Power off and restart to check
whether there’s the same fault
Reseat the sensor to
the condenser coil and
power on to restart
Yes
Wiring according to the
wiring diagram correctly
and power on to restart
No
Remove all the heat
sources
Yes
Yes
No
Replace the main
control board
Yes
Replace the fan and
high pressure switch
Yes
H8 (Pressure transducer(PT) fault)
Diagnosis Handling
Check whether pressure
transducer(PT) wiring is normal
Yes
Check whether the voltage
between gauging pressure
transducer(PT) white line and
black line is between 0.5-4.5V
when the system is on power
Yes
Restart to check whether
there’s the same fault
Wiring according to the
diagram correctly and
power on to restart
No
Replace pressure transducer
No
Keep on operating
Yes
Replace the main control
board
No
F1 (High pressure switch(HPS) fault)
Diagnosis Handling
Yes
Check whether high pressure
switch is close
Yes
Stop the unit for an hour to
check whether it reports the
same fault
No
Replace high pressure switch
No
Replace the main
control board
No
Keep operating
Yes
Check whether the service
valves are open
Open the service valve
Check whether the service
valves are open
Open the service valve