Installation Guide

WHL-648 Rev. 000 Rel. 002 Date 1.3.18
54
Error Code
Error Code
Description
Possible Remedies
Er:68
Mixing Valve Opera-
tion Error
(Mixing Valve Stuck in
Initial Position)
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 appliance.
2. Check wiring connections to mixing valve. Ensure all are secure.
3. Replace mixing valve.
4. If the problem persists, replace the main control.
Er:70
Register, Ram, Rom, I/O
Port, AD Abnormal, Im-
portant 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 appliance.
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 appliance cover. Ensure it is secure. Flame detection sensor can detect an external light source.
2. Check ame 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 (error occurs if there is no communication for ten [10]
minutes).
2. If the problem persists, replace the display and/or the main control.
Er:77
Outdoor Sensor
Shorted
The Error Code will go away when the condition is remedied.
If Error happens again:
1. Check outdoor sensor. Ensure all wiring connections are intact and secure. If the sensor wires were secured to the
wall with staples, the wires may have been damaged.
2. Check outdoor sensor resistance. If resistance is zero, replace the sensor.
3. If the problem persists, replace the outdoor sensor.
NOTE: When this error occurs, the appliance will still operate at the max setting of the Outdoor Reset Curve.
Er:80
Low Water Level
Sensor
(Low Water Level
Detected four [4] Con-
secutive 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 the system is lled with water. 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 detect-
ed 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 NTC detects
Vent Temperature is
Greater than 190
o
F
(88
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 30 - Error Codes and Suggested Corrective Actions
This appliance is equipped with a blocked vent shuto system. If Error Codes Er:29, Er:41, Er: 42, or Er:94 occur, turn o the gas valve at
the manual shuto. Check the vent terminations for obstructions. If no obstructions are found, reset the appliance by pressing the power
button. If the error continues to occur, call a qualied service technician or the gas supplier to check the appliance. Failure to follow these
instructions could result in property damage, personal injury, or death.