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.
| °F | setpoint |
idle |
|
|
Status | Operational |
|
ExitingSELECTServiceSET Mode | ||
DIAGNOSTIC ERROR CODES AND TROUBLESHOOTING PROCEDURES FOR HONEYWELL INTEGRATED
CONTROLS
(PDV AND INDUCED DRAFT MODEL SERIES)
Error | Definition of Code | |
Code | ||
|
4Low Flame Sense
Current
Pressure Switch
2Failed to Open (Stuck
Closed)
29Pressure Switch Failed to Close
Flame Sensed Out of
Normal Sequence
6(Before Opening Gas Valve or After Closing Gas Valve)
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 and wire. Clean flame sense rod with emery cloth. If problem is not solved, replace pilot. The pressure switch contacts did not return back to the normally open position at the end of the last heating cycle. The control checks to make sure the pressure switch is in the normally open position before allowing the blower to start the ignition sequence. Check to make sure the pressure switch tubing is not blocked. If the pressure switch tubing is clear, replace the pressure switch.
The pressure switch contacts did not close after the blower was energized. Check to make sure the blower is energized at the beginning of the heating cycle. If the blower did not start, check to make sure there is power to the motor. Replace blower or control board if defective. Check to make sure the venting system is not blocked. 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.
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.
54