Diagnostic Error Codes And Troubleshooting Procedures For Honeywell Intergrated Controls; 24 Volt Flue Damper Model Series - andrews ECOflo Series Installation And Service Manual

6.20 Diagnostic error codes and troubleshooting procedures for Honeywell integrated
controls (24 volt flue damper model series)
Error code Definition of code
4 Low flame sense
Damper end switch
55
failed to close
(stuck open)
56 Damper end switch
failed to open
(stuck closed)
6 Flame sensed out of
normal sequence
(before opening gas
valve or after closing
gas valve)
23 Flame detected
before ignition
24 Flame detected after
heating cycle
completes
31 Upper sensor
reading faulty
Issue 2 14/07/16
Cause of problem and actions taken to correct
Determine flame sense current in the Service mode with the water
heater operating. If less than 1.0 microamps, check pilot flame
sense rod with emery cloth. If problem is not solved, replace pilot.
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.
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 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 open. Replace
flue damper.
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.
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.
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.
Resistance of upper sensor out of operating range. Check
continuity of wire harness to upper sensor, and if O.K., replace
upper sensor.
Servicing 6
75