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3.USEAGE

Code

Uni t wor ki ng stat ue

Type

01(02) Pa

01(02) Pb

01(02) Pc

Failure

01(02 ) Pd

Protection

Comprssor stops

AC over high/low voltage
protection

Unit input voltage too high or too low. Check the voltage
of unit power supply if it's higher than 264V or lower
than 180V.

Compressor shut down due to
too high/low ambient
temperature

Ambient temperature is too high or too low for unit to
work.

Compressor speed limit due to
too high/low ambient
temperature

Compressor speed down

Ambient temperature is too high or too low for unit to
work in full speed. This is a normal protection and
doesn't need any treatment.

Preserved

01(02) F1

01(02) F2

01(02) F3

01(02) F4

01(02) F5

01(02) F6

01(02) F7

Outdoor ambient temp. sensor
failure

Comprssor stops

Check whether ambient temperature sensor is open,

short-circuit or value drifts too much. Replace it if

necessary. If unit gives this failure code only when

compressor is working, please check whether the ambient

temperature sensor and coil temperature sensor is mixed.

Outdoor evaporator coil temp.
sensor failure

Check whether outdoor coil temperature sensor is open,
short-circuit or value drifts too much. Replace it if
necessary.

Compressor discharge temp.
sensor failure

Check whether compressor discharge temperature sensor
is open, short-circuit or value drifts too much. Replace
it if necessary.

Outdoor Suction temp. sensor
failure

Check whether outdoor suction temperature sensor is
open, short-circuit or value drifts too much. Replace it
if necessary.

Evaporating pressure sensor
failure

Check whether evaporating temperature sensor is open,

short-circuit or broken. Replace it if necessary. If unit has

no low pressure sensor, then it should be a wrong Eeprom

setting on the power PCB.

Condensing pressure sensor
failure

High pressure switch failure

(

High/low pressure switch

failure, if system has low

pressure switch)

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Possible Reasons And Solutions

Compressor speed down due
to abnormal low pressure
detected by evaporating
pressure sensor

01(02 ) PE

Comprssor stops

Check whether condensing temperature sensor is open,

short-circuit or broken. Replace it if necessary. If unit

has no high pressure sensor, then it should be a wrong

Eeprom setting on the power PCB.

1.If pressure switch is in open position when unit is in
standby statue, or 2 minutes after compressor stops,
unit gives this failure. Check whether high or low
pressure switch is broken or not well connected.
2. If system gives 01(02) P5 3 times in a certain period
of time, unit stops until repowered (with 01(02) F7
failure code also shown on the display). Check
whether fan motor and water pump is working OK;
whether condensor is blocked; whether water
temperature too high, and whether water inlet&outlet
temperature has too big difference (should no bigger
than 8

℃

01(02) P9

Outdoor evaporator coil temp.
sensor protection

Comprssor stops

This is a protection caused by outdoor coil temperature

too high. Check whether air circulates fluently in outdoor

unit, air flow is too small, ambient temperature is too

high. If the same protection happens over 3 times in

certain period of time, unit can only be reset by repower.

Failure

Outdoor Unit Failure Codes.

This protection happens when system evaporating
pressure is higher than the set compressor speed-down
pressure point. If after slow down the compressor
speed but pressure still lower than the protection point,
compressor stops. Check whether water temperature
set value is too high; whether system water flow rate
too small; whether EEV works normally; whether air
circulates fluently in cooling mode or ambient
temperature too high in heating mode;If same
protection happens over 3 times in certain period of
time, unit shows

Fb.

(02)