Troubleshooting; Troubleshooting For Problem While Operation - LG THERMA V Air-to-Water Heat Pump Installation Manual

Check Points, Maintenance and Troubleshooting

Troubleshooting

If operates not properly or it does not start operation, please check following list.
Turn off the power before proceeding troubleshooting

Troubleshooting for Problem while Operation

No Problem
Heating or cooling is not
1
satisfactory.
Although electric power
supply is OK (control panel
2
displays information), the
outdoor unit does not start
working.
3
Water pump noise.
Water is flood out through
4
drain hose.
5
Sanitary water is not hot.
90 Air-to-Water Heat Pump
Reason
• Setting target temperature
is not proper.
• Charged water is not
enough.
• Water flow rate is low.
• Water inlet temperature is
too high.
• Water inlet temperature is
too low.
• Air purging is not
completely finished.
• Water pressure is low.
• Too much water is
charged.
• Expansion tank is damaged.
• Thermal protector of water
tank heater is activated.
• Sanitary water heating is
disabled.
• Set target temperature correctly.
• Check if temperature is water-based or air-based. See Function
code 03 and 05.
• Check pressure gage and charge more water until pressure gage is
indicating 2.0~2.5 bar.
• Check if strainer gathers too much particles. If so, strainer should be
cleaned.
• Check if internal water pump speed is NOT set as ʻHighʼ. It should
be set as ʻHigh.ʼ
• Check if pressure gage indicates above 0.3 bar.
• Check if water pipe is getting closed due to stacked particles or lime.
• If water inlet temperature is above 55°C, the outdoor unit does not
operated for the sake of system protection.
• If water inlet temperature is below 5°C, the outdoor unit does not
operated for the sake of system protection. Wait while indoor unit
warms up the water inlet temperature.
• Open the cap of air purge and charge more water until pressure
gage is indicating 2.0~2.5 bar.
• 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.
• Check if pressure gage indicates above 0.3 bar.
• Check if the expansion tank and pressure gage operates well.
• Flood out the water by opening the switch of the safety valve until
pressure gage is indicating 2.0~2.5 bar.
• Replace the expansion tank.
• Open the side panel of the sanitary water tank and push the reset
button of the thermal protector. (for more detail information, please
refer to installation manual of sanitary water tank.)
• Push button and identify if
panel.
Solution
icon is displayed on the control