11
4. Error Handling:
ERROR
CODE
ERROR STATUS
REASONS
ERROR HANDLING
A1
Thermal sensor
alarm
Water temp. sensor open
circuit or short circuit.
1. Check the water temp. sensor
connection.
2. Change the water temp. sensor.
A2
Condenser coil
sensor alarm
Condenser coil temp.sensor
open circuit or short circuit.
1. Check the condenser coil temp.
sensor connection.
2. Change the coil sensor.
A3
Exhaust sensor
alarm
Exhaust temp. sensor open
circuit or short circuit.
1. Check the exhaust temp. sensor
connection.
2. Change the exhaust temp. sensor.
A4
Ambient temp.
sensor alarm
Ambient temp. sensor open
circuit or short circuit.
1. Check the Ambient temp. sensor
connection.
2. Change the ambient temp. sensor.
A5
Low /High pressure
alarm
1.1. High pressure protection
switch off.
1.2. Ambient temp. too high or
water heat exchanger dirty
block.
2.1. Low pressure protection
switch off.
2.2. Leakage of refrigerant.
1.1Check
or
change
the
high
pressure protector.
1.2. Check if the surround temp. is
too high, or clean the heat
exchanger of water tank.
2.1. Check or change the low
pressure protector.
2.2. Supply refrigerant and check if
there is any leakage.
A6
(Auxiliary) electric
heater protection
overheat alarm
1. Electric heater protection
switch off.
2. Tank water temp. too high.
1. Check if the water temp. is as LCD
display, or if water temp. is too
high.
2. Change the Electric heater.
A7
Exhaust temperature
too high
1. Lack of refrigerant.
2. Mix with air in system.
3. Lack of lubricating oil.
1. Supply refrigerant.
2.
Re-vacuumizing,
and
fill
in
refrigerant.
3. Change the lubricating oil of
compressor.
A8
Condensate drain
hole blocked
1.condensate pipe blocked
；
2.Machine drain hole blocked
；
1.Check condensate pipe is blocked
or not.
2.Check machine drain hole is
blocked or not.
A9
Return gas temp.
sensor alarm
Return gas temp. sensor open
circuit or short circuit.
1.Check the Return gas temp.
sensor connection.
2. Change the ambient temp. sensor.
- -
Screen no display or
display insufficiency
1. No plug in power.
2. Mainboard and operation
panel communication break
off.
1. Check the power line and voltage.
2. Reconnect the line of
mainboard and operation panel.
3.
Change
the
mainboard
or
operation panel.
NOTE:
1. When the unit has error, the buzzer of the operation panel will make an alarm sound, and there will
show “Alarm” on the screen panel.
2. “ERROR CODE” will show on temperature display location by alternately.
3. Part of the error alarm can be automatically restored (resumed). That is the appeared alarm can be
eliminated by electronically controlled self-test.
4. Some of the error alarm is caused by large fluctuation of the external power, by this, just power off and
restart the unit to clear the error.
5. When the machine has error alarm and restart still can not eliminated error, please contact the after
service as soon as possible for solution.
