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 HONEYWELL INTEGRATED
CONTROLS (24 VOLT FLUE DAMPER MODEL SERIES)
Error
Code
Definition of Code Cause of Problem and Actions Taken to Correct
4
Low Flame Sense
Current
Determine flame sense current in the Service Mode with the water heater
operating. If less than 1.0 microamps, check pilot flame sense rod and wire.
Clean flame sense rod with emery cloth. If problem is not solved, replace
pilot.
55
Damper End Switch
Failed to Close
(Stuck Open)
Check to see if flue damper has fully opened. If not, disconnect damper
harness at damper plug connection and check for 24 volts between pins on
red and white wires. If no voltage, check wire harness or measure output on
control board (pins 1&4). If there is no voltage at the control board, replace
control. Replace wire harness if voltage does not pass to the pin terminals
from the control. If there is 24 volts at flue damper connection, replace flue
damper. If damper is open, disconnect harness and check continuity
between pins from black and yellow wires on flue damper. If no continuity,
replace flue damper.
56
Damper End Switch
Failed to Open (Stuck
Closed)
Check to see if flue damper has fully closed. If not, disconnect damper
harness at damper plug connection and check for 24 volts between pins on
red and white wires. If no voltage, check wire harness or measure voltage
output on control board (pins 1&4). If there is no voltage at the control
board, replace control. Replace wire harness if voltage does not pass to the
pin terminals from the control. If there is 24 volts at flue damper connection,
replace flue damper. If damper is closed, disconnect harness and check
continuity between pins from black and yellow wires on flue damper. If there
is continuity, the end switch is stuck closed. Replace flue damper.
SELECT
SET
Status
°F
idle
setpoint
Operational
Exiting Service Mode
25
Ecoflo E864_ADENDA_MAR 2012 itempOCT12 16/10/12 11:07 Page 25
Summary of Contents for CSC39
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