FOGATTI FDG370IN Manual page 42

Error Code
When the system
is turned on or
working, the
wired controller
displays
code"E5" and the
buzzer alarms
the fault.
During the
system working
process, the
wired controller
displays
code"E6" and
the buzzer
alarms the fault.
When the system
is turned on or
working, the
wired controller
displays "E7"and
the buzzer
alarms the
fault.
41
Possible Cause
1. The fan signal is not detected
or the speed is too low in the
system startup 5S.
2. During operation, the fan
speed is not detected for 2 s
consecutively, or the speed is too
low.
3. The power supply voltage is
too low, causing the fan speed to
slow down.
1. The gas supply pressure or
gas composition does not
match,causing abnormal
combustion;
2. The control program or
parameter settings are
incorrect,resulting in abnormal
combustion;
3. The water temperature sensor
specifications do not match, the
display temperature is much
higher than the actual
temperature;
4. The combustion system is
damaged or the specifications
are inconsistent, resulting in
abnormal combustion;
5. The heat exchanger fins of the
heat exchanger are poorly
welded,and the heat transfer is
slow.
After the water valve is
closed,the water in the tube is
continuously heated.
1. The valve connector is loose or
has poor contact.
2. The valve is short-circuited.
Tankless Gas Hot Water Heater
Fault Handling
1, 2, the fan assembly, controller
damage or line failure, causing
the fan not to run or the speed is
too low, check the fan, the main
controller is damaged, the wiring
is damaged, loose, replace the
damaged parts.
3. Confirm whether the power
supply and fan voltage meet the
design requirements.
1. Confirm that the gas type and
pressure meet the requirements
of the water heater;
2. Check whether the program
and parameters meet the values
of the parameter table;
3. Test whether the actual water
outlet temperature and the
wired controller display
temperature are close (±3 °C),
and replace the wrong outlet
water temperature sensor;
4. Check the combustion system
for damage and replace
damaged parts;
5. Detect if the heat exchanger
fins are poorly welded and
replace the damaged parts.
1. Clamp the water temperature
sensor terminal.
2. Check if the valve coil is short
circuited and replace the
damaged parts.
Installation Manual