Flow Adjustment Valve - A.O. Smith 110 Indoor Service Manual

10-8. Flow adjustment valve

Unit Part #
Function
Failure events
Effects on the water
heater if flow adjustment
valve fails
Error codes when flow
adjustment valve fails
Diagnostic
Color/Number of wires
The flow adjustment valve is assembled with the flow sensor.
Flow adjustment valve
#402 AOS Part #
Controls water flow to properly control the output hot water temperature.
1. Water leakage from valve.
2. The valve cannot modulate or make open/close positions.
1. Water leakage from failed valve can damage other water heater
components.
2. Temperature fluctuations in the hot water output.
1. Visual inspection: connection/breakage of wires, motor drive locked due
to scale buildup, and/or water leakage.
2. Check voltages and resistance; proper range of values shown below.
Black - Red 7 to 16 VDC and 0.09 to 0.2 kΩ
110 Indoor / 110 Outdoor Service Manual
319143-167
N/A
24
CONFIDENTIAL
Ver. 1.01
Checkpoint J