Installation / Operation Instruction Manual
48
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.
26
Exhaust Vent Limit
Switch Open
Check to see if the exhaust vent high limit switch, located on the draft hood has
opened. Depress the red manual reset button on the high limit switch. If it
resets with a “click”, the switch has opened. Check for evidence of blockage in
the exhaust vent. If there is evidence of blockage in the exhaust, call your
Plumbing Professional to the clear blockage. Do not continue to operate the
water heater with the blockage in the exhaust vent.
29
Flow Switch/Damper
Failed
Check to make sure the circulator is operating. Check to make sure the flow
switch closed when the circulator turned on. Make sure the damper opened
when the blower turned on. Control will reset once problem is corrected.
32
Sensor Reading
Faulty
Resistance of sensor out of operating range. Check continuity of wire harness
to sensor, and if O.K., replace sensor.
57
Flame Rod Shorted
to Ground
Pilot flame sensor rod is shorted to ground. Check to see if flame sensor wire
has bare spots touching metal parts of if flame sensor rod is touching the
burner or other metal parts. Replace if flame sense wire is damaged or flame
rod is bent.
58
AC Line Frequency
Error – Signal Too
Noisy or Frequency
Incorrect
Check line voltage frequency to the water heater. Determine if there are wide
fluctuations. Call an electrician if the problem persists. The water heater
should be on a separate line.
59
Line Voltage Too
Low or High
Check line voltage to the water heater. Determine cause of low or high voltage.
Call an electrician or your utility. The water heater should be on a separate
line.
61
DC Output Voltage
Unstable
Check line voltage to the water heater for erratic readings. Also check wiring to
make sure there are no shorts. If power supply and wiring are O.K., replace
control board.