8.Maintenance and repair
8.Maintenance and repair
30
31
3.
The normal failure and solutions
For any malfunctions, please refer to the table below :
4. FAQ
1
）
Why the compressor is not running when I start up the unit?
Answer
：
When the unit is powered on after the last shut-down, the compressor will not run
until 3 minutes later. This is the self-protection of the unit.
2
）
Why sometimes the outlet water temperature on the display increases slowly?
Answer
：
Because the water temperature is different between the upper layer and bottom
layer in the tank at the beginning. When the water temperature in all parts of the tank is
basically the same, it will rise faster.
3
）
Why the outlet water temperature on the display decreases when the unit is in heating
mode?
Answer
：
If the upper water temperature is much higher than that of the bottom water, the
water temperature will decrease a little because of the convection between hot water and
cold water in the tank.
4
）
Why does the unit not start up to heat when the outlet water temperature decreases?
Answer:
The water temperature will decrease because of the heat loss if the hot water in the
tank is not used for a long time. In order to avoid the continual ON/OFF, the unit does not start
up until the water temperature decrease for more than 5°C .
5
）
Why does the outlet water temperature decrease a lot abruptly?
Answer:
The temperatures of hot water and cold water in the tank are different. The cold
water may go to the upper sensor when the hot water have been used up.
6
）
Why the hot water is still available when the water out temperature on the display
decreases a lot?
Answer:
Because the upper sensor is positioned near the top of the tank, there is still 1/5 of hot
water available when the outlet water temperature on the display decreases a lot.
7
）
Why the compressor stops but the fan keeps running when the unit is in the heating
mode?
Answer:
The unit needs to defrost when the evaporator freezes because of the low ambient
temperature. The compressor will stop and the fan keeps running when the unit defrosts.
8
）
Why is the heating time so long ?
Answer:
Energy saving, little power consumption and long heating time are the
distinguishing features of the units. Normally, the heating time is 2~5 hours according to the inlet
water temperature, water consumption and ambient temperature.
Malfunction
Display
Canse
Solution
Bottom water
temp. Failure
P01
The water bottom temp. Sensor is
open or short circuit
Check or change the water
bottom temp. Sensor
Top tank water
temp. Failure
P02
The water top tank temp. sensor is
open or short circuit
Check or change the water
top tank temp. Sensor
Ambient
temp. Failure
P04
The ambient temp. sensor is
open or short circuit
Check or change the
ambient temp.
S
ensor
Coil temp. Failure
P05
The pipe temp. sensor is
open or short circuit
Check or change the
pipe temp.
S
ensor
Refrigerant absorb
temp. Failure
P07
The evaporator temp. Sensor
is open or short circuit
Check or change the
evaporator temp. Sensor
Anti-freeze temp. Failure
P09
The anti-freeze temp. Sensor
is open or short circuit
Check or change the
anti-freeze temp. Sensor
High pressure protection
E01
The exhaust pressure is high ,
high pressure switch action
Check high pressure switch
and cooling return circuit
Low pressure protection
E02
The suction pressure is low,
Low pressure switch action
Check low pressure switch and
cooling return circuit
Water flow failure
E03
No water or litter water
in water system
Check the flow volume ,water
pump is failure or not
Electric-heater
overheat protection
E04
Water flow volume not enough,Water
system pressure difference is small
Check the flow volume,water
system is jammed or not
Anti-freeze protection
E07
Water flow volume not enough,Water
system pressure difference is small
Check the flow volume,water
system is jammed or not
Anti-freeze protect level 1
E19
Ambient temperature is too low
Anti-freeze protect level 2
E29
Ambient temperature is too low
