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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 Collector
Limit Switch Open
Check to see if the exhaust collector high limit switch, located in the exhaust
collector area near the pressure switch 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 high temperatures in this compartment. If there
is evidence of high temperatures, call Tech Support. Do not continue to
operate the water heater if high temperature is occurring in this area.
29
Pressure Switch
Failed to Close
The blocked vent pressure switch contacts have opened. Check to make sure
the venting system is not blocked. Check to make sure the condensate drain is
not clogged and is sloping toward the drain. Make sure the vent length does
not exceed the specified limits. Make sure the vent terminal is not blocked.
Check to make sure the pressure switch tubing is clear. Replace the pressure
switch if the venting system has checked out O.K. Control will reset once
problem is corrected.
32
Lower Sensor
Readings Faulty
Resistance of lower sensor out of operating range. Check continuity of wire
harness to lower sensor, and if O.K., replace lower 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.