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Error Codes
The water heater has self-diagnos c func ons for safety and convenience when troubleshoo ng.
If there is a problem with the installa on or the unit, the error code associated with that failure will be displayed on the built-in
controller or remote controller. The display will fl ash E and the three digit number. It will show leading zeros. Example: E002
Error codes in the cascade system are diff erent. The heater number and E### (three digit number) will alternately fl ash on the
parent unit UIM. The child unit in error will fl ash the E### (three digit number) on it's UIM.
Consult the the table below for the descrip on of each error code.
Fault Analysis of Error Codes
If the water heater is displaying an error code, please check the following. A er checking, consult with the manufacturer.
Table 24: Error Code Fault Analysis
Error
Error Type
Code
E002
Hi-Limit Switches
E006
PCB Hardware Fault
E010
Frequency Fault
E011
PCB - Memory
E036
Flame Failure
1. Manual Hi-Limit Switch on water outlet tripped. Check the switch for proper
opera on. Press the reset bu on (center of the switch), to reset it. NOTE: You
will hear and feel the switch click when rese ng it.
If the high limit switch con nues to trip contact a qualifi ed service technician.
2. Automa c Hi-Limit Switch on burner door tripped. If the automa c Hi-limit
switch trip has occurred, it cannot be reset and must be replaced. Contact a
qualifi ed service technician.
1. Check PCB wiring for loose, damaged, or cut wires/connectors. Correct any loose
connec ons and replace any damaged wires/connectors. If all wires/connectors
are intact, replace the PCB.
1. PCB has detected an incorrect power supply frequency. Note the default fre-
quency is 60 Hz. Confi rm that C07 is set to the correct frequency of the supply
power. See Table 18 to access modes
2. If the se ng is correct and the error s ll occurs contact a qualifi ed service
technician.
1. The water heater will con nue to operate while in this error code is fl ashing,
however, the recircula on pump will be disabled. If this heater is part of a cas-
cade system, then the system will be aff ected based on the heater's se ng.
• Parent Heater: The cascade system will not operate. Remove this heater from
the cascade system and set a diff erent heater as the Parent.
• Child Heater: This heater will not operate. The rest of the cascade system will
con nue to run.
WARNING! Working on an energized circuit can result in severe injury or death from
electrical shock.
1. Check the fl ame sensor wire for a short or disconnec on. Correct any loose
connec ons and replace any damaged wire/connector. If the error s ll occurs,
contact a qualifi ed service technician.
Residen al Gas Tankless Water Heater Use and Care Guide • 57
TROUBLESHOOTING
Procedure
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