25
E3 Thermostat
(overheating)
failure
When the system starts or works normally, it is
detected that the overheating protection thermostat
is disconnected, and the thermostat is judged to be
faulty
Turn off water flow or
shut down to eliminate
E4 Outlet
temperature over
temperature fault
When the system is in a burning state, if the outlet
temperature is detected to exceed 85°C for 3
consecutive seconds, it is determined that the outlet
temperature is over temperature.
Turn off water flow or
shut down to eliminate
C4 Air duct blockage
failure
When the system is in the burning state, when the
smoke pipe is blocked or the back flow air is to a
certain degree (the action value is determined by the
current fan speed and current), it is judged as a wind
blockage fault.
Turn off water flow or
shut down to eliminate
E5 Fan failure When the system is turned on and there is water, the
wind speed is less than 600r/min for 2 seconds after
the fan is started, and it is judged as a fan failure
Turn off water flow or
shut down to eliminate
E6 Solenoid valve
E7
failure
When the system detects that the solenoid valve
(including the proportional valve) drives the triode
short circuit at startup, or the valve wiring of the
whole machine is disconnected, it is determined that
the solenoid valve is faulty
Turn off water flow or
shut down to eliminate
EE Timeout fault The system burns continuously for more than 40
minutes in a 40-minute timer mode, and it is judged
as a timeout fault
Turn off water flow or
shut down to eliminate
Remote control
communication
failure
The PCB of the remote control and the water
heater cannot be connected, and there is no signal
AC feedback
shut down to eliminate
Error code
Unable to recover fault code
Fault name Fault defnition description
A0 Watchdog circuit
failure
Controller watchdog circuit or chip is abnormal
A1 MCU PC
command failure
A2 Instruction
compilation and
A3 MCU RAM
fault
A4
MCU ROM fault
A5
MCU Register fault
When these codes appear, the system cannot be recovered at this time. You need to contact the after-sales
personnel to replace the corresponding PCB
The PC command of the main chip of the controller is abnormal
Controller main chip instruction compilation and
execution failure
The main chip ram of the controller does not pass the walk pat
check
The CRC test of the main chip ROM of the controller failed
The controller master chip failed the register test
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