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Q The heat pump unit repeats Run and Stop
A During hot water storage operation, if the outdoor air temp is rather low, the HP unit repeats
Run and Stop due to defrost operation.
During standby, if the outdoor air temp is below 5°C the water pump built in the HP unit might
start and stop in order to prevent water in the HP unit and piping from freezing.
And during standby, the fans on the HP unit might start and stop depending on the SW
setting in order to prevent snow from accumulating on the fan. (SW setting is required)
Q During hot water storage operation, the surface of the air heat exchanger becomes white
with frost.
A If the outdoor air temp is rather low, the surface of the air heat exchanger may be covered
with frost during operation.
Q During hot water storage operation, water comes out from the HP unit.
A When the HP unit retrieve heat from the air, dew condensation comes out. And if the outdoor
air temp is rather low, much water comes out due to melted ice by defrost operation.
Q Hot water does not come out
A If no hot water or no water comes out, water in the pipe may be frozen. Please consult with
the dealer where you purchased.
If only water (not hot water) comes out, it is the states that hot water is not stored in the
cylinder.
Please start operation to top up or to fill up and store hot water in the cylinder.
Q Hot water amount is decreasing despite no usage of hot water.
A The display of hot water amount shows the hot water amount in the cylinder whose temp is
about 50°C or higher.
If hot water does not be used for a long period of time, hot water in the cylinder becomes
colder due to natural heat dissipation and the display of hot water amount decreases.
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When error happens
However, please note the following cases are not anomaly.
The cases that are not anomaly
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