Lennox LIAC024-180P431, Руководство по установке

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30
E9 (EEPROM fault)
Diagnosis Handling
Power off and re-power on to
see whether it is normal
Yes
Caused by electricity grid
strong interference. Go back
to normal when electricity grid
is normal
Re-insert the EEPROM
Replace the mainboard
No
F3/P5
(
condensor coil temperature(T3) protection in cooling)
Diagnosis
Handling
Yes
Check whether T3
/
T5 are
abnormal according to
resistance
No
Check whether outdoor unit fan
is abnormal and whether the
outdoor condenser coil is
blocked by debris
No
Check whether there's short
circuit in air outlet and inlet side
when the ambient temp. is high
No
Restart to check whether
there’s the same fault
No
Replace sensors
Yes
Replace the fan and
exclude the surrounding
debris of heat exchanger
Yes
Keep operating
No
No
Check refrigerant filling
amount according to
refrigerant filling mode
Refill enough amount of
refrigerant
Yes
Replace installation position
or rectify the surrounding
goods to avoid air return short
circuit
Yes
Replace the mainboard
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
wired according to wiring
nameplate
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
nameplate correctly and
power on to restart
No
Exclude influence by the
nearby heat sources
Yes
Replace the mainboard
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
thansducer(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
nameplate correctly and
power on to restart
No
Replace pressure sensor
No
Keep on operating
Yes
Replace the mainboard
No
F1
(
High pressure switch(HPS) fault)
Diagnosis Handling
Yes
Whether high pressure switch
resistance is normal
(CLOSE is normal)
Yes
Stop the unit for an hour to
check whether it reports the
same fault
No
Replace high pressure switch
No
Replace the mainboard
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