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Flammable Vapor Sensor Testing
Do not use standard multi-meter probes for this testing. Doing so will damage the con-
nector. Use special pin type electronic probes or small diameter wire pins inserted into
connector.
Step 1.
Move the gas control power switch to the "OFF"
position.
Step 2.
Disconnect the flammable vapor sensor / resettable thermal switch (FVS/
RTS) harness from the gas control.
FVS/RTS harness
Step 3.
Using a multi-meter set to the ohms setting, measure the resistance of
the flammable vapor sensor.
Step 4.
Using a multi-meter set to the ohms setting, measure the resistance of
the resettable thermal switch (between the left two pins of the wire harness). The
resistance must be between 3,000 and 48,000 ohms for both the switch and sensor. If
the resistance is out of this range, verify that the resettable thermal switch has not
been tripped. If it hasn't, replace the thermal switch.
120 VAC Circuit Trace
Step 1.
Verify 120VAC and proper polarity are at the wall outlet.
Step 2.
With the water heater plugged in and the gas control power switch in the
"ON" position verify LED status.
120 VAC Circuit Trace
CAUTION
Gas control power
switch
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