11
TROUBLESHOOTING
This unit has the ability to check its own operation continuously. If an error occurs, a message will flash on the digital
monitor of the front panel.
This assists with diagnosing the error, and may enable you to overcome a problem without a service call. Please quote
the code displayed when inquiring about service.
NOTE:
In all cases you may be able to clear the Error Message simply by turning the hot water tap OFF, then ON again. If
this does not clear the Error Message, try pushing the ON/OFF button OFF, then ON again. If the Error Message still
remains, contact our service center or your nearest service agent and arrange for a service call.
1- 877-934-7455
8am-4:30pm CST, Monday through Friday
Troubleshooting
Code Displayed Fault Remedy
E1
E2
E3
E4 / E5
E6 / E7
E8 / E9
E11
E12
E13
E14
E15
E16
E17 / E18
E19 / E20
E21
E22
E24
E27
E28
E30 / E31
E34
E35
E36
E37
E38
E39
E40
E41
E42
E43
E45
E46
Remaining flame detected
Ignition failure
Weak flame or abnormal combustion
An outlet thermistor open/short
A H/E thermistor open/short
An inlet thermistor open/short
A DC motor failure
Water temperature too hot
No filled water in tank or pressure switch failure
A controller failure concerning an inlet thermistor
A controller failure concerning a H/E thermistor
A controller failure concerning an outlet thermistor
A burner thermistor short/open
A secondary air hole thermistor short/open
A vent condition is not normal
Temperature too high on a burner thermistor
Mixing control valve is not connected
Mixing control valve initialization failure
Power line of main gas valve is open
Rotation of a DC fan is too high/low
Carry over gas valve is not connected
Modulation gas valve is not connected
A controller failure concerning gas valve
Communication failure with SUB CPU
Sub's RAM failure
A controller failure concerning sub's flame signal
Main's RAM failure
A controller failure concerning flame signal
Main's ROM failure
Main's MUX error
No air pressure during DC motor operating
Detection of Oxygen depletion
Call service center
Check gas line, igniter, flame rod
Gas line not supplying enough gas
Check outlet thermistor and wiring
Check H/E thermistor and wiring
Check inlet thermistor and wiring
Call for replacement motor
Check flow sensor or CPU
Check water tank or pressures witch
Call service center
Call service center
Call service center
Check burner thermistor and wiring
Check air hole thermistor and wiring
Check vent condition for backflow
Call for replacement thermistor
Check mixing valve wiring
Call for replacement valve
Check wiring, thermostat and fuse
Call for replacement motor
Check carry over gas valve wiring
Check modulation gas valve wiring
Call service center
Call service center
Call service center
Call service center
Call service center
Call service center
Call service center
Call service center
Check intake or vent condition
Call service center
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