Lennox LIAC060-180P431 - Fan, Voltage, and Pressure Faults

28
Eb/E6 (DC fan motor fault)
Diagnosis
Handling
Check whether motor wiring is
reliably connected according to
the nameplate
Yes
Check whether outdoor unit is
sheltered
No
Reseat the wiring
according to wiring
nameplate
No
remove impurities around
outdoor unit
Check whether there’s 15VDC
Between P8 and P2
Check whether wiring is
correct, replace the
mainboard
Yes
No
Yes
Replace the motor to check
whether it is normal after
restart?
Replace the mainboard
No
P8 (Hurricane protection of the DC fan motor(for 48、60))
Diagnosis Handling
Check whether motor wiring is
reliably connected according to
the nameplate
Yes
Check whether there’s 15VDC
between P8 and P2
Yes
Cheak whether the high speed
operating of fan motor was
caused by external force
No
Cheak whether it reports
P8 when stopping
No
Replace the motor
Reseat the sensor
according to wiring
nameplate
No
If wiring is correct, replace
the mainboard
No
Avoid motor is influenced by the
external force when stopping
Re-power on when lock up
Yes
Replace the mainboard
Yes
F4/P0 (High module radiator temperature (TF)protection)
Diagnosis
Handling
Check whether the radiator is
damaged or badly fixed
No
Check whether there’s dust or
fallen leaves influencing
radiating
No
Check whether the fan and
blade can normally operate
Yes
Check whether the duct,
including radiator, is blocked
by debris
No
Check whether resistance
of Tf is in the range of
TABLE2
Yes
Reseat Tf, power off and
restart to ccheck whether
there’s the same fault
Fix the radiator. If
radiator is damaged,
replace it
Yes
Clean radiator duct
Yes
Replace motor or blade
No
Replace Tf
No
Troubleshoot surrounding
influence to the duct
Yes
Replace compressor driver
Yes
E5(Voltage protection)
Diagnosis
Handling
Check whether the power
supply voltage is between
208V-10% and 230V+10%
Yes
Check whether the power supply is
reliably connected, whether the
power supply wire diameter meets
the requirements in the manual
Yes
Cut off the power, and wait until
compressor operates normally
Yes
Test whether there’s 380vDC
on the terminals of CN31
when compressor is operating
Yes
Check whether there’s
high-power equipment
nearby
Check power supply
to troubleshoot
problems
No
Replace power supply
wire or connect power
supply wire well
No
Replace the mainboard
Replace the mainboard
No
Yes
Separate high-power
equipment and power supply
No
Caused by power supply
voltage instantaneous
fluctuation. Recover when
power grid is normal
No