14
2. High-pressure switch
is damaged
；
3.Refrigerant system
block
；
4. EEV deadlock
。
2.
Check if high-pressure
switch is off
；
3.
Check if refrigerant system
is blocked
4.
Switch heat pump off,
then turn it on and off to
check if EEV r e s e t can
be heard.
2.
Replace high-pressure
switch
3.
Replace filter
4.Replace EEV
P03
Low pressure
protection
1. Lack of gas
2.Refrigerant system
block
；
3.Heat pump operating
range exceeded
1.
Check if gas system is
leaking
2.
Check if filter is blocked
3.
Check if ambient temp. or
water temp.are above limits
1.
Repair the
leak
and refill with gas
2.
Replace filter
P04
T3 Coil
overheat
protection
1.
Heat Pump
fan
discharge area is
blocked
2.
Evaporator
is blocked
3.
T3
coil
sensor
position
was changed
1.
check if the discharge area
is open/free
2.
check if the evaporator is
blocked
3.
check if the coil sensor
resistance value is correct
1.
Free up the discharge area
2.
Clean the evaporator
3.
Replace sensor
P05
Exhaust gas
temperature
protection
1.
Lack of gas
2.
sensor position
was changed
1.
Check if there is a leak in
the refrigerant system
2.
Check if the sensor
resistance value is correct
1.
Repair leak and refill gas
2.
Replace sensor
P06
Outlet water
temperature
anti-freezing
protection
1.
lower water flow
；
2.
heat exchanger
blocked
；
3.
Y-shaped filter
blocked
；
4.
Overlow load
。
1.
check if there is air in
water system
；
2.
Plate heat exchanger if
blocked
；
3.
check if Y-shaped filter has
block
；
4.
check that design of
indoor water system is
appropriate, if there is a
water bypass
。
1.
If there is a problem
with the drain valve,
replace it
；
2.
blow plate heat exchanger
with water or high-pressure
gas from the opposite
direction
；
3.
clean Y-shaped filter;
4.
water system must have
bypass
P07
Pipe
temperature
anti-freeze
protection
1.
lack of gas in system
2.
water sytem is
blocked
；
3.
cooling system is
blocked
。
1.
check system for
leaks
；
2.
check if Y-shaped filter
is blocked
；
3.
check if cooling system
filter is blocked
。
1.
Repair leak and refill gas
；
2.
Clean Y-shaped filter
；
3.
Change filter
。
P08
High-pressure
2 protection
High pressure switch 2
fault
check if high pressure switch
2 cuts out under unit OFF
condition
change high pressure switch 2
E01
Controller
communicatio
n failure
Communication
cable fault
Check communication cable
Re-connect or change
connection cable
E02
TP1 exhaust
gas
temperature
sensor failure
sensor temperature
deviation or
failure
Check sensor
resistance value or if
sensor is faulty
Re-connect cable or
change sensor
