Flammable Vapor Sensor Testing

Flammable Vapor Sensor Testing (cont’d)

Step 3. Using a multi-meter set to the ohms setting, measure the resistance of the flammable vapor sensor and resettable thermal switch. The resistance must be between 3,000 and 48,000 ohms. If the resistance is out of this range, verify that the resettable thermal switch has not been tripped. If it hasn’t, replace the flammable vapor sensor.

Flammable vapor

sensor harness

120 VAC Circuit Trace

Note: The 120 VAC Circuit Trace section is in addition to the Defender Atmospheric service manual, p/n 238-44943-00.

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.

Relay Replacement

Note: The Relay Replacement section is in addition to the Defender Atmospheric service manual, p/n 238-44943-00.

Step 1. Move the gas control power switch to the “OFF” position.

Gas control power

switch

Step 2. Unplug the water heater and Accessory Module from the wall outlet.

Water heater power cord and

Accessory Module transformer

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Bradford-White Corp PE4503*F(BN,SX) Flammable Vapor Sensor Testing cont’d, VAC Circuit Trace, Relay Replacement

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