Check Points, Maintenance and Troubleshooting
If operates not properly or it does not start operation, please check following list.
Troubleshooting
Turn off the power before proceeding troubleshooting
Troubleshooting for Problem while Operation
CAUTION
94
Air-to-Water Heat Pump
No Problem Reason Solution
Heating or cooling is not
satisfactory.
Although electric power
supply is OK (remote
controller displays
information), the unit does
not start working.
Water pump noise.
Water is flood out through
drain hose.
Sanitary water is not hot.
• Setting target temperature
is not proper.
• Charged water is not
enough.
• 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.
• Water flow rate is low.
1
2
3
4
5
• Set target temperature correctly.
• Check if temperature is water-based or air-based. See Function
code 03 and 05 in Chapter 6.
• Check pressure gage and charge more water until pressure gage
is indicating 200~250 kPa.
• Check if strainer gathers too much particles. If so, strainer should
be cleaned.
• Check if internal water pump speed is NOT set as ‘High’. It should
be set as ‘High.’
• Check if pressure gage indicates above 30 kPa.
• Check if water pipe is getting closed due to stacked particles or
lime.
• If water inlet temperature is above 55 °C, the unit does not
operated for the sake of system protection.
• If water inlet temperature is below 5 °C, the unit does not operated
for the sake of system protection. Wait while unit warms up the
water inlet temperature.
• 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.
• Check if pressure gage indicates above 30 kPa.
• 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 200~250 kPa.
• 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 icon is displayed on the
remote controller.
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Summary of Contents for Therma V AHUW096A2
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