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Page
240 (T-H3J), 340 (T-H3S) and 540 (T-H3) models Service Manial
Ver. 1.00
CONFIDENTIAL
10-10. Flow sensor
Part#
• 319143-463 (EK129)
Unit Part#
#402
Function
Detects and measures water flow rate using a spinning impeller and
magnetic pick-up.
Failure events
Unable to detect or measure any water flow rate.
Effects on the water heater
if flow sensor fails
Ignition sequence does not start (water heater will not initiate any
operation)
Error codes when flow
sensor fails
441 (only within Easy-Link systems)
Diagnostic
1. Visual inspection: connection/breakage of wires and/or debris on
impeller.
2. Check voltages: proper range of values shown below.
Color / Number of wires
Red - Black
4.0 to 5.5 VDC (Input)
Check
point
H2
White(85) -Black 1.0 to 4.0 VDC (pulse)
1,080 pulse/min (more than 18 Hz)
The flow sensor is assembled with the flow adjustment valve.
Flow
adjustment
valve
Flow sensor
Flow
adjustment
valve
Flow sensor
IN
OUT
OUT
IN
Flow sensor
Red
White
Black GND
OUTPUT
VCC
>P
PE
-GF
<
3-3/8" (84.4 mm)
2
1
3
1
2
3
1-7/8" (47 mm)
2-5/8" (67.5 mm)