Troubleshooting
5 Troubleshooting
5.1 Diagnostic Codes and Remedies
Before You Call For Service Troubleshooting Tips Save time and money! Review the charts on the following
pages first and you may not need to call for service.
This water heater incorporates a variety of shut off devices that prevents the operation of the water heater
down if undesirable combustion conditions occur. Such as the presence of a blockage of the combustion air
vent insufficient gas or pressure which can impact the safe operation of the water heater. Please contact a
Qualified Service Technician if this occurs. When the water heater fails, the display shows the fault code,
and the buzzer continuously sends out "B, B, B" alarms. Please follow the table below.
Error Code
When the system is turned
on or working, the wired
controller displays code
"E0", and the buzzer
alarms the fault.
When the system is turned
on the working or the
working, the displays code
"E1" and the buzzer alarms
the fault.
When the system is turned
on, the wired controller
displays code "E2" and the
buzzer alarms the fault.
When the system is turned
on or working, the wired
controller displays code
"E3" and the buzzer alarms
the fault.
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Possible Cause
1. The outlet water temperature sensor
connector is loose or has poor contact.
2. The outlet water temperature sensor is
damaged (open circuit, short circuit or
metal parts).
1. The gas valve is not open.
2. The gas supply pressure or gas
composition is abnormal, causing
accidental flameout.
3. The igniter, ignition needle is damaged
or the line is faulty.
4. Damage to the flame induction needle
or wire failure.
5. The combustion system (burner, nozzle,
air control panel, proportional valve,
sectional valve) is damaged, the
specifications are inconsistent or the
wiring is wrong, resulting in abnormal
combustion.
6. The control program or parameter
settings are incorrect, resulting in
unstable combustion.
7. The fan speed is abnormal, resulting in
unstable combustion.
1. The feedback pin is bent and in contact
with other metal parts.
2. The feedback pin plug-in terminal is
loose and hits the metal part.
3. Feedback pin wire is broken.
1. The thermostat opens or the wire is
faulty.
2. The gas supply pressure or gas
composition does not match, causing
abnormal combustion.
3. The control program or parameter
settings are incorrect, resulting in
abnormal requirements combustion.
4. The combustion system is damaged or
the specifications are inconsistent,
resulting in abnormal combustion.
Fault Handling
1. Clamp the outlet water temperature
sensor terminal.
2. Replace the water temperature sensor.
1. Open the gas valve to ensure that the
water heater can get normal gas supply.
2. Confirm that the gas type and pressure
meet the requirements of the water heater.
3. Check if the igniter, ignition pin and circuit
are damaged, and replace the damaged
parts.
4. Check if the flame induction needle is
damaged and replace the damaged parts.
5. Check if the combustion system is
damaged, if the wiring is wrong, and
replace the damaged parts.
6. Check whether the program and
parameters meet the values in the
parameter table.
7. The wind speed of the fan is abnormal.
Check whether the program and
parameters meet the values in the
parameter table.
1. Replace the ignition feedback needle
assembly.
2. Plug the feedback pin terminal correctly
and firmly into the feedback pin.
3. Check if the wire is disconnected and
replace the wire.
1. Check the temperature controller or
circuit and replace the damaged parts.
2. Confirm that the gas type and pressure
meet the requirements of the water
heater.
3. Check whether the program and
parameters meet the values of the
parameter table.
4. Check the combustion system for
damage and replace damaged parts.