Bradford-White Corp D-38T-155 service manual Control Board Replacement, Control board replacement

Page 34

SERVICE PROCEDURE D24-IV

Control Board Replacement

DANGER

120 volt exposure. To avoid personal injury, unplug while performing this procedure.

Control board replacement

Step 2: Unplug wire connections from board.

Step 1: Disconnect Power

23

24

Depress

plasticWire connections tabs

Step 3: To remove board, tilt control panel to the right and slide control hook tabs from slots in control panel.

25

Slots in control panel

Unhook tabs from control panel slots

To remove lower sensor

Remove clip, pull sensor out.

26

Remove clip

Pull out sensor

IMPORTANT

When replacing lower sensor, make sure sensor is fully inserted into the well and securely held by the clip on the well groove. (see photo 25)

Page 34

34

Image 34
Contents Service Manual To be performed only by qualified service providersTable of Contents Features of Honeywell Integrated Controls System Tools Required for Service Specifications Sequence of Operation Lockout ConditionVoltage at primary pins 1&3 white TroubleshootingPins to black and white wires DefectiveFrom previous Displaying temperature SensorsExample of error code shown on control display Operate?Using Control Display for Servicing Water Heater Sensor is used Setpoint Display/Change Software Version Display only Select SET ExitingSELECTServiceSETMode Display of Water TemperatureTo Display and Change Temperature Setpoint To Display Flame Sense Current of the Pilot Flame SensorSetpoint Flashes Selectset Idle Status Operational Error Codes and Error History Display Error Code HistoryTo view previous error codes ExitingSELECTServiceSET Mode Error Code Definitions Error Code Shown Water Heater Display Press for 3 seconds to reset control in service modeDo not reset the display from the hard lockout Service Procedure D24-IThermostat Circuit Testing State without correcting the causeService Procedure D24-I Lower Sensor Upper SensorUpper thermister location Applicable models Pilot Operation Testing Service Procedure D24-II131 Pilot Inspection Meter Probe Micro-amp readings MeterProbe Micro Amp =Main Burner Operation Testing Service Procedure D24-III114 See Pilot Inspection section Build-up causing restrictionHeater. Refer to Installation Instructions InspectionMain Burner Removal Service Procedure D24-IVMain Burner & Pilot Removal and Inspection Main Burner InspectionFlame Rod Pilot Burner RemovalPilot Burner Inspection Ferrule NutControl board replacement Control Board ReplacementTo remove lower sensor Service Procedure D24-V Flue Baffle Removal, InspectionService Procedure D24-VI Approximate Anode Rod Locations Generic Parts List 15A 16/16A 17/17A13A 14A 16A 17A6A 11A 10A 18A 15A 19A 12A 20A 19B 20B 17B18B 16B 12B10B 13B 14B 15BECO BTU/HCO2 GFIPage Page Parts@bradfordwhite.com Techserv@bradfordwhite.com