EEPROM data
EE27
read malfunction
The inter-chip
communication
EE28
failure on the
main control
board
Inlet water
PP 01
temperature
sensor failure
Outlet water
PP 02
temperature
sensor failure
Heating piping
PP 03
sensor failure
Gas return sensor
PP 04
failure
Ambient
PP 05
temperature
sensor failure
Exhaust piping
PP 06
sensor failure
Antifreeze
PP 07
protection in
Winter
Low ambient
PP 08
temperature
protection
Piping
temperature too
PP 10
high protection
under cooling
mode
Water
temperature (T2)
PP 11
too low
protection under
cooling mode
1. Wrong EEPROM data in the program or
failed input of EEPROM data
2. Main board failure
Main board failure
1. The sensor failure or short circuit
2. The wiring of sensor is loose
1. The sensor failure or short circuit
2. The wiring of sensor is loose
1. The sensor failure or short circuit
2. The wiring of sensor is loose
1. The sensor failure or short circuit
2. The wiring of sensor is loose
1. The sensor failure or short circuit
2. The wiring of sensor is loose
1. The sensor failure or short circuit
2. The wiring of sensor is loose
Ambient temperature or water inlet
temperature is too low
1. Beyond the scope of using environment
2. Sensor abnormality
1. Ambient temperature is too high or the
water temperature is too high in cooling
mode
2. Refrigeration system is abnormal
1. Low water flow
2. T2 temperature sensor abnormal
1. Re-enter correct EEPROM data
2. Change a new main board
1. Turn off electricity supply and
restart it
2. Change a new main board
1. Re-fix the wiring of the sensors
2. Change the sensor
1. Re-fix the wiring of the sensors
2. Change the sensor
1. Re-fix the wiring of the sensors
2. Change the sensor
1. Re-fix the wiring of the sensors
2. Change the sensor
1. Re-fix the wiring of the sensors
2. Change the sensor
1. Re-fix the wiring of the sensors
2. Change the sensor
Normal protection
1. Stop using, beyond the scope of
using
2. Change the sensor
1. Check the scope of using
2. Check refrigeration system
1. Check water pump and waterway
system
2. Change T2 temperature sensor
68