Gfi - A.O. Smith 710 ASME Service Manual

10-16. GFI

Unit Part #
Function
Failure event
Effects on the water
heater if the GFI fails
Error codes when the GFI
fails
Diagnostic
Color / Number of wires
From transformer
#712 AOS Part #
-Detects electrical leakage in the water heater.
-Stops providing power to the water heater in the case of electrical leakage.
1. ON-failure: Always in the ON mode (never trips).
2. OFF-failure: Always in the OFF mode (always stays tripped).
1. ON-failure: GFI cannot detect electrical leakage within the water heater.
2. OFF-failure: the water heater does not receive any power from the GFI, which
means the water heater cannot operate.
1. V isual inspection: connection / breakage of wires and/or some signs of
electrical damage on the GFI.
2. Check the power supply to the GFI. If the red LED on the GFI lights up after
pressing the "test" button, the GFI is receiving power. After verifying the power
supply, verify that 100 VAC is entering and leaving the GFI.
To the computer board
710 / 710 ASME Service Manual
319143-227
N/A
N/A
2 - 3 / 4 " ( 7 0 m m )
1 - 7 / 8 " ( 5 0 m m )
31
CONFIDENTIAL
Ver. 1.00
Checkpoint A,A1