Error codes, Causes and Likely Solutions
Lower tank water
temp. sensor failure
The temp. sensor is open
or short circuit
Check and replace the lower
temp. sensor
Upper tank water
temp. sensor failure
The temp. sensor is open
or short circuit
Check and replace the upper
temp. sensor
Inlet evaporator. temp.
sensor failure
The temp. sensor is open
or short circuit
Check and replace the evaporator
inlet temp. sensor
Outlet evaporator
temp. sensor failure
The temp. sensor is open
or short circuit
Check and replace the evaporator
outlet temp. sensor
Ambient temp.
sensor failure
The temp. sensor is open
or short circuit
Check and replace the ambient
temp. sensor
Too much refrigerant in
the unit
2,bad heat exchanger on t
he air
1. Discharge the excess gas safely
2. clean the air side heat exchanger
Refrigerant level low or
there is a block in the filter
or capilliary
Water flow is not enough
Expansion sensor is
broken
1.check if there is any leak and refill
the gas
2.replace the filter or capillary
3.clean the water side exchanger
or discharge the air in the water loop
4.Check or replace the expansion valve
AUX-
heating thermal
protect
The electronic heating
temp. protection has
activated
Check the water supply for
insufficient flow and tank for air
Communication failure
between wire controller
and main board
Check the wire connection between
the wire controller and the main
board
This is not an error it is a natural function of the unit
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