High Water Temperature Limit Control | Bradford-White Corp 900kW

NOTE: The control values

programmed into memory will not be lost

because of a power failure.

ERROR MESSAGES DISPLAYED BY THE ELECTRONIC TEMPERATURE CONTROL

There are seven error messages that can be displayed in response to software or hardware problems with the boiler’s internal electronic temperature control. The error codes that may be seen flashing on the display are:

OE - ROM Error

The internal ROM of the microprocessor in the boiler’s electronic temperature control is defective. This error cannot be field repaired. Replace the water heater’s electronic temperature control.

AE - RAM Error

The internal RAM of the microprocessor in the boiler’s electronic temperature control is defective. This error cannot be field repaired. Replace the water heater’s electronic temperature control.

SF - Sensor Failure

The display flashing SF indicates an out-of-range or defective sensor. Make sure sensors are properly installed, wired and connected to the control. Correct sensor installation or replace sensor.

EF- EEPROM Failure

The values read form the EEPROM are not the same as the values written into the EEPROM. This error cannot be field repaired. Replace the water heater’s electronic temperature control.

CF - Calibration Failure

The calibration resistor reading was not within the range of the Analog to Digital converter. This error cannot be field repaired. Replace the water heater’s electronic temperature control.

OF - Stray Interrupt Failure

An unused interrupt occurred. This error cannot be field repaired. Replace the water heater’s electronic temperature control.

CE - Configuration Error

The device hardware was configured to a nonexistent device. This error cannot be field repaired. Replace the water heater’s electronic temperature control.

HIGH WATER TEMPERATURE

LIMIT CONTROL

FIG. 21	High Water Temperature Limit Control
	- Fixed Setting

The unit is equipped with a fixed setting, manual reset high water temperature limit control. The water heater temperature limit control has a fixed limit setting of 195° F (90.6° C). If water temperature exceeds the limit set point, the limit will break the control circuit and shut down the unit. The limit control can only be reset after the water temperature has cooled below the set point of the limit. The high water temperature limit control is mounted on the surface of the tank, above the heating element installed at the highest point in the tank. The high limit control is reset by pushing the red reset button on the control. Operation of the limit control usually indicates a major problem with the thermostat, contactors or heating elements. Do not continue to push the

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Bradford-White Corp 900kW, 9kW service manual High Water Temperature Limit Control

Models: 9kW 900kW Commercial Electric Water Heaters