Westinghouse WGR-076 Series Installation, Start-Up, Maintenance, Parts, Warranty page 36

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Code Short Description
High Limit Temperature
F03
Protection
F05 Incorrect Fan Speed
F07 Vent Temperature Too High
F08 Flame Circuit Failure
F09 Valve Feedback Error
F12 EEPROM Integrity Lockout
Tank Sensor Data Not
F14
Consistent
F21 ADC Failure
WHL-001 Rev. 3.16.15
Long Description
The control shuts down the
water heater after it has met /
surpassed the high temperature
limit.
The control detects incorrect fan
speed.
The vent temperature has met /
surpassed the maximum limit for
more than 15 minutes.
The control detects an incorrect
flame level.
The gas valve does not respond
to controller demands.
The EEPROM check fails.
EEPROM data is corrupted.
The data received from the tank
sensors exceeds the difference
allowed by the control.
The ADC test has detected a
major fault in the electronic
components.
Corrective Action
1. Manually reset the water heater.
2. Observe water heater operation. If fault code occurs again:
3. Check the Dual Temperature Sensor. Ensure it is properly
wired to the control, and that there are no breaks, cuts, or other
visible issues with the sensor wire.
4. Use an ohmmeter to check resistance on first Sensor A, then
Sensor B of the Dual Temperature Sensor.
5. Replace Dual Temperature Sensor if either Sensor A or Sensor
B fails the resistance test. See Figure 24.
Figure 25 - Sensor Detail
1. Manually reset the water heater.
2. Observe water heater operation. If fault code occurs again:
3. Check condition of wiring.
4. Check Fan PWM connections at control board and fan.
5. Replace fan.
1. Manually reset the water heater.
2. Observe water heater operation. If fault code occurs again:
3. Replace sensor.
4. Measure actual vent temperature.
1. Manually reset the water heater.
2. Observe water heater operation. If fault code occurs again:
3. Check ignitor cable connections.
4. Check ignitor cable ground.
5. Replace cable.
6. Check spark gap between spark electrode and burner.
7. Replace ignitor.
1. Manually reset the water heater.
2. Observe water heater operation. If fault code occurs again,
reset the water heater and:
3. When water heater attempts to fire, check voltage at the gas
valve connector. If there is voltage, but no gas pressure on the
outlet side of the valve, the valve is stuck closed. Replace the
gas valve.
4. If there is no voltage at the ignition phase, replace the control
board.
1. Manually reset the water heater.
2. Observe water heater operation. If fault code occurs again:
3. Replace the controller.
1. Manually reset the water heater.
2. Observe water heater operation. If fault code occurs again:
3. Check the Dual Temperature Sensor. Ensure it is properly
wired to the control, and that there are no breaks, cuts, or other
visible issues with the sensor wire.
4. Use an ohmmeter to check resistance on first Sensor A, then
Sensor B of the Dual Temperature Sensor.
5. Replace Dual Temperature Sensor if either Sensor A or Sensor
B fails the resistance test. See Figure 24.
1. Manually reset the water heater.
2. Observe water heater operation. If fault code occurs again:
3. If fault code occurs again, replace the controller.