lp-672 Rev. 000 Rel. 002 Date 10.3.18
50
Error Code
Error Code Description
Possible Remedies
Er:70
Register, Ram, Rom, I/O Port,
AD Abnormal, Important
EPROM Data or Safe Data
Abnormal
This Error Code will go away when the condition is remedied.
If Error happens again:
1. Turn power OFF and ON at the main power switch internal to the water heater.
2. If the problem persists, replace the main control.
Er:72
Flame Signal Detected before
Ignition
This Error Code will go away when the condition is remedied.
If Error happens again:
1. Check the water heater cover. Ensure it is secure. Flame detection sensor can detect an external light
source.
2. Check flame detection sensor. Ensure connections are secure. Normal operating settings are more than
2.5DC before ignition, less than 2.5DC after ignition.
3. If the problem persists, replace the main control.
Er:76
Poor Communication
This Error Code will go away when the condition is remedied.
If Error happens again:
1. Check connections from main control to display panel.
2. If the problem persists, replace the display and/or the main control.
Er:80
Low Water Level Sensor
(Low Water Level Detected
four [4] Consecutive Times)
This Error Code will go away when the condition is remedied.
If Error happens again:
1. Ensure all valves are open to the appliance and there are no leaks.
2. Ensure all air has been purged from the system.
3. Check wiring connections to low water level sensor. Ensure all are secure.
4. Check low water level sensor resistance. If resistance is zero, replace the sensor.
5. If the problem persists, replace the main control.
Er:81
Low Water Level Circuit
This Error Code will go away when the condition is remedied.
If Error happens again:
1. Ensure all valves are open to the appliance and there are no leaks.
2. Check wiring connections to low water level sensor. Ensure all are secure.
3. Check low water level sensor resistance. If resistance is zero, replace the sensor.
4. If the problem persists, replace the main control.
Er:85
Freeze Protection
(Appliance has detected water
temperature below 34
o
F
[1
o
C])
This Error Code will go away when the freezing condition is remedied.
If Error happens again:
1. Ensure appliance is located in a mechanical room protected from freezing conditions.
2. Ensure all valves are open to the appliance, there are no leaks.
2. Check wiring connections to low water level sensor. Ensure all are secure.
3. Check low water level sensor resistance. If resistance is zero, replace the sensor.
4. If the problem persists, replace the main control.
Er:94
Exhaust (Eh) NTC detects Vent
Temperature is Greater than
190
o
F (87.8
o
C)
This Error Code will go away when the condition is remedied.
If Error happens again:
1. Check if dip switch High Fire setting is ON. Switches 6 and 7 should be OFF for normal operation.
2. Check exhaust temperature sensor. Ensure connections are secure.
3. Check sensor resistance. If resistance is zero, replace the sensor.
4. Check exhaust vent for blockage.
5. If the problem persists, replace the control.
6. If the problem persists, replace the heat exchanger.
Table 26 - Error Codes and Suggested Corrective Actions
This water heater is equipped with a blocked vent shutoff system. If Error Codes Er:29, Er:41, Er: 42, or Er:94 occur, turn off the gas valve at
the manual shutoff. Check the vent terminations for obstructions. If no obstructions are found, reset the water heater by pressing the power
button. If the error continues to occur, call a qualified service technician or the gas supplier to check the water heater. Failure to follow these
instructions could result in property damage, personal injury, or death.
