4. Usage
If unit continuously failed to finish the defrosting operation for three times, it stops and gives failure code S08
This can only be recovered by re-powering the machine. Please check whether the actual water temperature is
too low for the unit to defrost
,
so
the
plate
heat
exchanger
has
the
risk
of
freezing
up
If unit stops due to
“
too small water flow rate
”
protection
(
S02
)
over
three
times
in
certain
period
of
time
,
unit
stops
and
gives
S
10
failure
code
.
It
can
only
be
recovered
by
re
-
powering
the
unit
.
Check
the water
system
,
especially
the
filter
;
check
the
working
statue
of
water
pump
.
If unit stops due to
“
Indoor anti-freezing protection in cooling (S01)
”
over
three
times
in
certain
period
of
time
,
unit
stops
and
gives
S
11
failure
code
.
It
can
only
be
recovered
by
re
-
powering
the
unit
.
E.
Press to turn ON/OFF of heat pump operation.
When the unit is powered, home page will be shown on the screen. After repowered, unit will recover its
working mode and settings automatically.
5. Serial port connect error
Serial port connect error means the communication between operation panel and indoor PCB or outdoor
PCB hasn't been set up successfully. Check the cable connection in between. Check whether the last three
switches on outdoor power PCB are set to 001; whether last three switches on indoor PCB are set to 001.
Unit recovers when communication recovers.
6. Cooling water Temp. too low
Compressor stops if water outlet is lower than 5
℃
in cooling mode. This too low water temperature may
make the water freeze up inside plate heat exchanger and cause damage. Check whether temperature
sensor Tc is OK and well connected; whether set water temperature too low; whether system flow rate too
small.
7. Water outlet Temp. too high
Compressor stops if water outlet is higher than 57
℃
in heating or hot water mode. This too high water
temperature may make the system has too high condensate pressure inside and cause unit malfunction.
Check whether temperature sensor Tc and Tw is OK and well connected; whether set water temperature
too high; whether system flow rate too small.
8. Defrosting Failure
.
9. Water outlet Temp. too low
This is also used to protect the safety of the compressor. Compressor stops and AH (or HBH) starts if
water outlet temperature is lower than 15
℃
in heating and hot water mode. Compressor restarts when this
temperature is higher than 17
℃
.
10. Too small water flow rate failure
11. Indoor anti-freezing protection failure in cooling
ON
/
OFF
776
