P01
Type
Protection
Code
Description
Main line current
protection
P02
Compressor phase
current protection
P03
IPM module
protection
P04
Compressor oil
return protection
Solution
Input current too high or too low, or system works in over-load
condition. Unit recovers automatically after 5 minutes when it
happened the first time. If same failure happened 3 times in a certain
period of time, unit stops until repowered. Check unit input current.
Check whether fan motor and water pump is working OK; whether
condenser is blocked; whether water temperature too high, and
whether water inlet&outlet temperature has too big difference
(should no bigger than 8
℃
)
Unit working
statue
Compressor stops
Compressor stops
Compressor input current too high or too low, or system works in
over-load condition. Check compressor input current. Check whether
fan motor and water pump is working OK; whether condenser is
blocked; whether water temperature too high, and whether water
inlet&outlet temperature has too big difference (should no bigger
than 8
℃
)
Compressor drive failure. Check whether cable is broken or loosen.
Check whether compressor driver PCB or compressor is broken.
Compressor speed
up
If unit has been continuously working in low speed for certain period
of time, unit starts this protection to suck compressor oil back into
compressor. This is a normal protection and doesn't need any
treatment.
Blinking
times
1
2
3
4
P05
Compressor shut
down due to high/
low pressure switch
open caused by
abnormal high/low
pressure
If system pressure is too high or too low, it activates this protection.
Unit recovers automatically after 5 minutes when it happened the
first time. If same failure happened 3 times in a certain period of
time, unit stops until repowered. Check whether fan motor and water
pump is working OK; whether condenser is blocked; whether water
temperature too high, and whether water inlet&outlet temperature
has too big difference (should no bigger than 8
℃
)
5
Compressor stops
Compressor stops
【
Outdoor
】
Ambient temperature is too high or too low for unit to work.
P11
Compressor shut
down due to too
high/low ambient
temperature
If system pressure is too high , it activates this protection. Unit
recovers automatically after 5 minutes when it happened the first
time. If same failure happened 3 times in a certain period of time,
unit stops until repowered. Check whether fan motor and water pump
is working OK; whether condenser is blocked; whether water
temperature too high, and whether water inlet&outlet temperature
has too big difference (should no bigger than 8
℃
)
Standard function,
doesn't need any
treatment.
This is a normal protection and doesn't need any treatment. When
compressor did not work for long time and ambient temperature is
low, compressor crankcase heater work for certain period of time
before compressor start to warm up the compressor.
Check whether water temperature set value is too high, especially
when ambient temperature is low; whether water flow rate too small;
whether system is lacking of enough refrigerant.
Check whether air circulates fluently in outdoor unit.
P07
Compressor
preheating
P08
Compressor
discharge temp. too
high protection
P09
Outdoor evaporator
coil temp. sensor
protection
P06
Compressor speed
down due to
abnormal high
pressure detected
by condensing
pressure sensor
Unit input voltage too high or too low. Check the voltage of unit
power supply.
P10
AC over high/low
voltage protection
6
Compressor stops
7
8
Compressor stops
9
Compressor stops
10
Compressor stops
11
Compressor stops
This is a normal protection and doesn't need any treatment.
Compressor speed
down
Compressor speed
limit due to too
high/low ambient
temperature
P12
0
9. Failure Code
95
Summary of Contents for Thermal Plus 12
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