4. Usage
4.4 Failure codes
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
】
Operation of digital thermostat
1) Press for 3 seconds to turn ON OFF of the electric heater. When heater is turned OFF, it shows
"- - -".
2) When heater is turned ON, press for 3 seconds to show the set temperature. After release, this set
temperature blinks on the display.
3) When set temperature is blinking, press or to increase or decrease the set temperature of electric
heater.
4) Controller will save this setting and show actual water temperature in the display if no operation in 6
seconds.
105
