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COMPREHENSIVE APPLICATION AND INSTALLATION MANUAL
LG Electronics
Installation check listConguration
System Design ApplicationsIntroduction
Code
No.
Description Cause Normal Condition
14 Problem in ow switch
• Flow switch is open
while internal water
pump is working
• Flow switch is open
while DIP switch
No.5 of Main PCB
assembly(Heater) is set
as on.
• Flow switch should be
closed while internal water
pump is working or DIP
switch No. 5 of Main PCB
assembly(Heater) is set
as on
• Flow switch should be open
while internal water pump is
not working
15 Water pipe overheated
• Abnormal operation of
electric heater
• Leaving water tempera
-
ture is above 57 °C
• If there is no problem in
electric heater control,
possible maximum leaving
water temperature is 57 °C
20 Thermal fuse is damaged
• Thermal fuse is cut off
by abnormal overheat
-
ing of internal electric
heater
• Mechanical fault at
thermal fuse
• Wire is damaged
• This error will not be hap
-
pened if temperature of
electric heater tank is below
80 °C
2.2 Trouble shooting
No Problem Reason Solution
1
Heating or Cooling
is not satisfactory.
Setting target
temperature is not
proper.
• Set target temperature correctly.
• Check if temperature is water-based or air-
based. See ‘Remote sensor active’ and ‘Temp.
selection’ chapter.
Charged water is
not enough.
• Check pressure gage and charge more water
until pressure gage is indicating 200~250 kPa.
Water ow rate
is row.
• Check if strainer gathers too much particles.
If so, strainer should be cleaned.
• Check if pressure gage indicates above 4 Bar.
• Check if water pipe is getting closed due to
stacked particles or lime.
2
Although electric
power supply is
OK(remote control
-
ler displays informa-
tion), the unit does
not start working.
Water inlet
temperature is too
high.
• If water inlet temperature is above 55 °C, unit
does not operate in order to protect the system.
Water inlet tem
-
perature is too low.
• If water inlet temperature is below 5 °C, the
unit does not operate in order to protect the
system. Wait while unit warms up the water inlet
temperature.
3 Water pump noise.
Air purging is
not completely
nished.
• Open the cap of air purge and charge more
water until pressure gage is indicating 200~250
kPa.
• If water does not splash out when the tip (at the
top of the hole) is pressed, then air purging is
not completed yet. If well purged, the water will
splash out like fountain.
Water pressure
is low.
• Check if pressure gage indicates above 30 kPa.
• Check if the expansion tank and pressure gage
operate well.
4
Water is ood out
through drain hose.
Too much water is
charged.
• Flood out the water by opening the switch of
the safety valve until pressure gage is indicating
200~250 kPa.
Expansion tank is
damaged.
• Replace the expansion tank.
5 DHW is not hot.
Thermal protector
of water tank
heater is activated.
• Open the side panel of the DHW tank and push
the reset button of the thermal protector. (for
more detail information, please refer to installa
-
tion manual of DHW tank.)
DHW heating is
disabled.
• Select DHW heating operation and identify if
icon is displayed on the remote controller.
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