Heiko Thermal Plus 12, User Manual

Page: 64 / 110

D. Warning
When the unit is having a protection or failure, a symbol will be shown on the display. Please enter
"Info" menu to check the protection or failure codes.
Some information, protections and failures that are more likely to happen, will shown in front page so the
customers can see it easily:
Yellow —— Outdoor unit protection or failure
Red —— System protection or failure
1.
Coil Temp. Too Low
This is indoor coil temperature too low. This happens in cooling operation of the unit. Too low coil
temperature may make the water freeze up inside plate heat exchanger and cause damage.
. When this happens,
please :
A. Check whether set temperature for cooling is too low; whether system has too small water flow rate;
check water system especially the filter .
B. Check whether system has not enough refrigerant inside by measuring the evaporating pressure .
C. Check whether ambient temperature is lower than 15 ℃.
It means
Unit recover
automatically when this coil temperature goes over the safety value again
2. Water Flow Rate Too Small
System water flow rate is less than minimum allowable flow rate. Check the water system,
especially the filter; check the working status of water pump.
3. Water Flow Switch Failure
Water flow switch should be in open mode when unit circulation pump is working. If not, the unit thinks
the flow switch itself is broken. Check whether flow switch is broken or not well connected. Check
whether there is another pump that circulates the water through the unit, when unit circulation pump is
working.
4. Communication Failure
Communication failure shown here means the communication between operation panel, indoor PCB and
outdoor PCB has been set up, but communication data loses too much. Check whether communication
cable is longer than 30M; whether there is a source of the disturbance nearby the unit. Unit recovers
when communication recovers.
into
6. Introduction Of Operation Panel
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