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TROUBLESHOOTING
12 TROUBLESHOOTING
12.1 OPERATION
Condition
Unit is not operating
The water does not become hot or it
takes a time for it to heat up
Water comes out of the outdoor unit
Water comes out of the tank unit
Steam is coming out of the outdoor
unit
No hot water
Water is coming out of the safety
pressure relief valve
If the unit still fails to operate normally after carrying out the inspections in the Troubleshooting section, close the water heater shut-
off valve and turn the breaker off before calling your sales agent. Inform your agent of the model of your unit, its production number
and date of installation. Please also provide your sales agent with an explanation of the failure, considering the following symptoms:
Breakers trip and fuses blow frequently.
-
Foreign matter or water have spilled accidentally inside the unit.
-
Cables are hot or the wire coating is damaged.
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The control panel displays error codes.
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There is water in the leak water receiver in the hot water tank.
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The heat exchanger in the hot water tank has failed.
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Water is leaking from the tank or from pipes (The hot water tank unit is not operating normally).
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Water output is poor (The outdoor unit is not operating normally).
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The strainer in the pressure reducing valves of the water installation has become clogged.
-
?
N O T E
In particular when the room lights are dimmed, a slight fluctuation of brightness in lighting may occur upon starting of heating operation. This is of no
consequence. The conditions of power supply established by the local power supply companies are to be observed.
25
PMML0451 rev.2 - 03/2018
Check whether a power outage has occurred, a fuse is blown or the breaker has tripped.
Check whether the timer has been set and if it has been correctly set.
Check whether the water temperature is correctly set.
Check whether the air outlet or air inlet of the outdoor unit has been blocked.
Check whether the unit is leaking water.
The outdoor unit discharges water during defrosting.
In a cold area, this water could freeze so the water outlet on the outdoor unit must not be blocked.
When the outdoor unit is installed overhead, use a bush to connect a drain pipe to the water outlet to arrange
proper discharge.
When the temperature of incoming water is very low and the air around the tank is very humid, dew may
form on the surface of the metal or piping and may condensate as water drops.
This is steam generated by frost melting during defrosting in the outdoor unit
Check if a water outage has occurred. Turn the breaker off and close the water valve during a water outage.
Water leakage during heating operation is normal.
The water in the tank is expanding as it is being heated up, and about 3% of the volume of the tank is
discharged.
During operation other than heating, water leakage from the water outlet indicates that the safety pressure
relief valve is defective.
Check the following
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