Heiko Thermal Plus 12 User Manual Download Page 98

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Type

Code

Description

Solution

Unit working
statue

Blinking
times

Compressor stops

S08 Defrosting Failure

Compressor stops
and AH (or HBH)
works

S09

Water outlet Temp.
too low protection
in heating/hot water

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

℃

. This is a

protection for protecting the safety of the compressor, as too low
water temperature in heating or hot water mode may kill the
compressor.

Compressor stops

S07

Water outlet Temp.
too high protection
in heating/hot water

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.

Unit stops

S05

Serial port connect
error

Communication failure between operation panel and the indoor or
outdoor PCB. Check the cable connection in between. Check whether
the last three switches on outdoor power PCB are set to 001; Whether
four switches on indoor PCB are set to 1000. Unit recovers when
communication recovers.

Compressor stops

S06

Water outlet Temp.
too low protection
in cooling

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.

Protection

Unit stops

S04

Communication
failure

Communication data lost too much. Check whether communication
cable is longer than 30M; whether there has a source of the
disturbance nearby the unit. Unit recovers when communication
recovers.

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.

Compressor stops

S10

Too small water flow
rate failure

If unit stops due to “too small water flow rate”protection code(S02)
over three times in certain period of time, unit stops and gives S10
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.

Compressor stops

S11

Indoor Anti-freezing
Protection Failure in
Cooling

If unit stops due to “Indoor Anti-freezing protection in cooling (S01)”
over three times in certain period of time, unit stops and gives S11
failure code. It can only be recovered by re-powering the unit.

E01

System

failure

Communication
between operation
panel and indoor
PCB or outdoor
PCB failure

E02

Communication
between outdoor
main control PCB
and module PCB

Check the communication cable between outdoor power PCB and
deiver PCB. Check whether outdoor power PCB and deiver PCB is
broken.

E03

Compressor phase
current failure
(open/short circuit)

Check whether the power cable to compressor is broken or short-
circuit.

E04

Compressor phase
current overload
(over current)

Check whether the power cable to compressor is broken or short-
circuit.

E05

Compressor driver
failure

Check whether compressor drive PCB is broken, or cable to
compressor is wrong connected.

E06

Module VDC over
high/low voltage
failure

Input voltage too high or too low.

E07 AC current failure

Check the current to outdoor unit, and compare it with the unit
current shown on the operation panel. If the difference is not big,
check whether the system has enough refrigerant (more likely it is not
enough refrigerant that caused this abnormal low current). If the
difference is big, outdoor power PCB is broken. Please replace it with
a new one.

E08 EEPROM failure

Cut the unit power and short-circuit JP404 port on outdoor power
PCB, repower the unit, cut power again and cancel the short-circuit
on JP404 port. If still not OK, replace the outdoor power PCB.

Compressor stops