Lennox LNINVC052, Руководство по обслуживанию

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56
Installation and Maintenance
Service Manual
17
Decrease
frequency
due to high
air discharge
F9
Flash
9 times
every 3s
■ ■ □ □
All loads
operates
normally,
while
operation
frequency of
compressor
decreases.
Overload; ambient
temperature is too
high;
1. Reduce load;
Refrigerant is not
enough
2. Add refrigerant
Malfunction
of electronic
expansion valve
（
EKV
）
3. Replace
electronic
expansion valve
→ replace outdoor
unit's main board
AP1
18
DC busbar
voltage is
too high
PH
Flash
11 times
every 3s
□ ■ □ ☆
During cooling
and drying
operation,
compressor
stops while
indoor fan
operates.
During heating
operation, all
loads stop.
1. Measure the
voltage at position
L and N on wiring
board (XT). If the
voltage is higher
than 265VAC,
wait until the
power voltage is
decreased within
normal range and
then turn on the
unit;
1. Check whether
power supply
network is
abnormal;
2. If AC input
is normal,
measure the
voltage between
A and B ends
of electrolytic
capacitor (fig. 30
in 9.1) on control
board (AP1)
after turning on
the unit. If it's
normal, the circuit
has malfunction.
Please replace
the main board of
outdoor unit.
2. Replace outdoor
unit's main board
AP1;
19
Detection
malfunction
of system
current
U5
Flash
13 times
every 3s
□ ■ ☆ ■
During cooling
and drying
operation,
compressor
and outdoor
fan stop while
indoor fan
operates.
During heating
operation, all
loads stop.
Malfunction of
circuit on outdoor
unit's main board
AP1. Replace
outdoor unit's
main board AP1.
1. Replace outdoor
unit's main board
AP1