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 too low 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 is too low; whether system flow rate is too small.
7. Water Outlet Temp. Too High
Compressor stops if water outlet is too high in heating or hot water mode. This too high water temperature
may make the system has too high condensing pressure inside and cause unit malfunction.
Check whether temperature sensor Tc and TW is OK and well connected; whether set water temperature is
too high; whether system flow rate is too small.
8. Defrosting Failure
9. System Initialization
When unit has just been turned ON, this information will be shown. It will disappear after system
initialization is finished.
10. Too Small Water Flow Rate Failure
If unit stops due to “small water flow rate” protection (S02) over three times in certain period of time, unit
11. 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
E. ON
/
OFF
Press to turn ON/OFF of heat pump operation.
When the unit is powered, home page will be shown on the screen. After re-powered, unit will recover its
working mode and settings automatically.
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.
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.
time, unit stops and gives S11 failure code. It can only be recovered be re-powering the unit.
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6. Introduction Of Operation Panel
Summary of Contents for Thermal Plus 12
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