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Step 6:
Continue pressing the “Temperature Down” button to change to the next error code index and press “Select” to view the
error code number, if any, for that index number. Continue on to index #1, the oldest error code index. The water heater
display will store up to 10 error codes with the oldest code starting in code index #1 with the most recent code in code
index #10.
Step 7: 10 seconds after the last button press, the Water Heater Display will revert back to the current error code display.
To exit Service Mode, either wait 30 seconds or press Temperature Up button and Select Button for 3 seconds.
DIAGNOSTIC ERROR CODES AND TROUBLESHOOTING PROCEDURES FOR EF MODELS WITH HONEYWELL
INTEGRATED DIRECT SPARK IGNITON CONTROL SYSTEM
Error
Code
Definition of Code Cause of Problem and Actions Taken to Correct
No code –
blank
display
Check power supply to the water heater. Make sure water heater is plugged in
and the breaker is on. Check if there is 120 volts power supply to the LINE
connections on the control board. If 120 volts is present, check for 24 volts
output to SECONDARY terminals on the Control Board. Check for loose wires,
defective transformer. Check wire harness connections from display to the
control board.
4
Low Flame Sense
Current
Determine flame sense current in the Service Mode with the water heater
operating. If less than 4.0 microamps, check burner flame sense rod and wire.
Clean flame sense rod with emery cloth. If problem is not solved, check for
debris clogging burner or replace flame sense rod.
6
Flame Sensed Out of
Normal Sequence
(Before Opening Gas
Valve or After
Closing Gas Valve)
Check to make sure gas valve has closed. No voltage should be present at the
gas valve before or after ignition cycle. Make sure wire positions on the wire
harness are correct. If gas valve is stuck open, replace.
23
Flame Detected
Before Ignition
Check to make sure gas valve has closed. No voltage should be present at the
gas valve before the ignition cycle. Make sure wire positions on the wire
harness are correct. If gas valve is stuck open, replace.
24
Flame Detected After
Heating Cycle
Completes
Check to make sure gas valve has closed. No voltage should be present at the
gas valve before the ignition cycle. Make sure wire positions on the wire
harness are correct. If gas valve is stuck open, replace.
SELECT SET
Status
°F
idle
setpoint
Operational
&
%
Exiting Service Mode