Bradford White EF120T4003NA3 Service Manual page 21

Definition
Error Code
of Code
Water
temperature
172 sensor
resistance
invalid
NOTE
Cause of Problem and Actions Taken to Correct
• Hold 93 will be displayed if this value remains out of range
• Measure the resistance of the water temperature sensor and compare it with the tank
temperature using the chart below.
• If there is do display, check primary/secondary voltage
• Before troubleshooting always verify the following
o Gas inlet pressure
o Static to dynamic gas pressure drop
o
No vent and intake restrictions
o All wire connections are tight
o No grounded wires or missing grounds
o No water leaks
21
21