Service Manual

For models with Honeywell Integrated Control
System w/ Direct Spark Ignition
The system will go into lock out mode for the following reasons:
1. ERROR CODE 26
If the blocked vent safety switch mounted on the draft hood should open, the gas valve will close, the blower
will post-purge and error code 26 will appear
on the display. The lockout condition will reset once the problem is
corrected and the switch reset. Refer to “Vent Safety Switch Testing and Replacement” in this Service Manual.
2. ERROR CODE 29
If the circulator flow switch or the damper contacts fail to open
or close in the normal sequence of operation, the
gas valve closes, and error code 29 will appear on the control display. When the condition is corrected, the error
code will disappear and the water heater will resume normal operation. No resetting of the control display
is
needed for resetting this error code.
3. ERROR CODE 62 or 63
Control board will go into “Soft Lockout” if the main burner cannot be lit or fails to prove flame after 3 ignition trials.
The water heater display indicates a lockout condition by showing an
error code number (62 or 63) with “Service
Needed” in the control display window. Refer to error codes in the diagnostic section of this Service Manual. In a
“Soft Lockout” condition, the control will wait for 60 minutes and then make 3 more attempts to light the main
burners
. Soft lockout reset is accomplished by depressing the lower right button under “Reset” for 3 seconds.
4. ERROR CODE 65
If the top of the tank should exceed 207°F, then the high limit control will shut off the burner and the water heater
will go into a “Hard
Lockout”. Error code 65 will be shown in the water heater display. The control can only be
reset in the “Service Mode”, which is detailed in the “Troubleshooting” section of this Service Manual.
Lockout Conditions (Complete list of error codes is listed on the unit)
CONNECTION/WIRING DIAGRAM
9
9