3
6. Error code
Use
Failure
1
79
E0 2
E 0 3
E 0 4
E 0 5
E06
E07
E08
E 0 9
E a
Eb
P01
Ec
P0 2
Unit working statue
Unit work ing st atue
Failure
Code
Type
Sanitary hot water temp. sensor
failure
Sanitary hot water mode
is not available.
Check whether sanitary hot water temperature sensor is
open, short-circuit or value drifts too much. Replace it
if necessary.
Heating water temp. sensor
failure
Heating mode is not
available.
Check whether heating water temperature sensor is
open, short-circuit or value drifts too much. Replace it
if necessary.
Cooling water temp. sensor
failure
Cooling mode is not
available.
Check whether cooling water temperature sensor is
open, short-circuit or value drifts too much. Replace it
if necessary.
Unit water outlet temp. sensor
failure
Unit stops
Unit stops
Check whether unit water outlet temperature sensor is
open, short-circuit or value drifts too much. Replace it
if necessary.
Unit water inlet temp. sensor
failure
Check whether unit water inlet temperature sensor is
open, short-circuit or value drifts too much. Replace it
if necessary.
System 1 indoor coil temp.
sensor failure
System 1 stops
System 1 stops
Check whether indoor coil temperature sensor of
system 1 is open, short-circuit or value drifts too much.
Replace it if necessary.
System 2 indoor coil temp.
sensor failure
For dual compressor system: check whether indoor coil
temperature sensor of system 2 is open, short-circuit or
value drifts too much. Replace it if necessary. For single
compressor system: check dip-switch numbe rDIP2-1.
It should be in OFF position.
Indoor EEPROM failure
Unit keep on working
Reset EEPROM setting. If still not OK, replace the
indoor PCB. Reset EEPROM: Press "reset" button on
indoor PCB, unit will reset EEPROM automatically.
After done, LED light for indicating the statue of relay
"YL" will be powered. Repower the unit.
Too small water flow rate
failure
System 1 communication
protection
Compressor stops
System 1 stops
System 1 stops
Compressor stops
System water flow rate is less than minimum allowable
flow rate. Check the water system, especially the filter;
check the working statue of water pump.
Water flow switch failure
Water flow switch failed to work. Check whether flow
switch is broken or not well connected.
Communication data lost too much. Check whether
communication cable is correctly connected; check
whether communication cable is longer than 30M;
whether there has a source of the disturbance nearby
the unit. Unit recovers when communication recovers.
System 2 communication
protection
Communication data lost too much. Check whether
communication cable is correctly connected; check
whether communication cable is longer than 30M;
whether there has a source of the disturbance nearby
the unit. Unit recovers when communication recovers.
P 0
3
Communication data lost too much. Check whether
communication cable is correctly connected; check
whether communication cable is longer than 30M;
whether there has a source of the disturbance nearby
the unit. Unit recovers when communication recovers.
Warning but unit keeps
on working
Operation panel communication
protection
P
0 4
This failure happens when a external master unit is used
to control the heat pump unit via Modbus.
Communication data lost too much. Check whether
communication cable is correctly connected; check
whether communication cable is longer than 30M;
whether there has a source of the disturbance nearby
the unit. Unit recovers when communication recovers.
Unit stops
Master unit communication
protection
Protection
【
】
Failure for indoor unit
Room temperature sensor failure
Room temperature is out
of control
Check whether room temperature sensor is open,
short-circuit or value drifts too much. Replace it if
necessary.