DV Series
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Closed Circuit Thermopile Testing
(White Rodgers Electronic and Honeywell)
Closed circuit thermopile testing is the preferred method for testing the thermopile.
Step 1. Following the lighting instruction label on the
heater, proceed to light the pilot and allow to
operate for three minutes. If the pilot will not
stay lit, hold the pilot button (rotate the gas
control knob to the pilot position, push and
hold in) during this test.
Step 2. Using a multimeter capable of measuring
millivolts, place one lead of the multimeter on
the left side of the wire harness and place the
second lead of the multimeter on the right side
of the wire harness.
Step 3. If meter reads 300 millivolts or higher, the
thermopile is O.K.. If reading is below 300
millivolts, replace the pilot assembly per
Service Procedure VI.
Open Circuit Thermopile Testing
(White Rodgers Electronic and Honeywell)
Step 1. Disconnect the red and white pilot wires from the gas control.
Step 2. Using a multimeter capable of measuring millivolts, connect one lead to the red
thermopile wire and one lead to the white thermopile wire.
Step 3. Following the lighting instruction label on
the heater, proceed to light the pilot and
allow the heater to operate for three
minutes. It will be necessary to hold
the gas control knob down in the
“PILOT” position
continuously
throughout this test. A reading over
400 millivolts indicates a good thermopile
output.
Step 4. A reading under 400 millivolts indicates a
bad thermopile; replace the pilot
assembly per Service Procedure VI.
Service Procedure II
Thermocouple/Service
Testing and Replacement
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