ES AWH11-V5+, User Manual

Page: 66 / 86

3. Usage
66
Unit working st atue Failure Code Type
Failure
Indoor Unit Failure Codes
00 Pa
00 P9
Compressor stops
Compressor stops if water outlet is higher than 57
℃
in
heating or hot water mode. Check whether temperature
sensor Tc and Tw is OK and well connected; whether
set water temperature too high; whether system flow
rate too small.
Water outlet Temp. too high
protection in heating/hot water
00 P8
Compressor stops if water outlet is lower than 5
℃
in
cooling mode. Check whether temperature sensor Tc is
OK and well connected; whether set water temperature
too low; whether system flow rate too small.
Compressor stops
Water outlet Temp. too low
protection in cooling
Possible Reasons And Solutions
00 P7 Too small water flow rate
protection
00 P6
1.
Check whether set temperature for cooling is too low;
whether system has too small water flow rate; check
water system especially the filter.2.Check whether
system has not enough refrigerant inside by measuring
the evaporating pressure. 3.Check whether ambient
temperature is lower than 15
℃
.
System 1 indoor anti-freezing
protection in cooling
Compressor of system 1
speed stops. If this
failure doesn't recover
automatically after
3 minutes, it must have
happened over 3 times in
a certain period of time.
If so, it can only be
recovered by
repowering the unit.
Unit will restart after
3 minutes
System water flow rate is less than minimum
allowable flow rate. If the same protection happens
over 3 times in certain period of time, unit will not
restart and show "too small water flow rate failure".
Check the water system, especially the filter; check
the working statue of water pump. Check whether
flow switch is broken so it is blocked in "OFF" mode.
System 2 Water outlet Temp.
too low protection in
defrosting
Compressor of system
2 quit defrosting and
switch back to
heating/DHW
operation
When unit is working in defrosting, if water outlet
temperature is too low, water may freezing up in
plate heat exchanger and damage the plate heat
exchanger. When this happens, unit quit defrosting
and switch back to heating/DHW operation. It may
cause quite thick ice on evaporator coil. Please set
the set temperature for heating/DHW higher, or
turn ON the back-up heating system so actual water
temperature is high enough for defrosting operation.
If water volume in the system is too small that cause
the water temperature drops too much in defrosting
operation, please add a buffer tank that matches the
unit capacity to the system. Please check whether
indoor coil temperature sensor and water outlet
temperature sensor is mixed, so the reading of outlet
water temperature drops dramatically during
defrosting operation.