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SERVICE PROCEDURE RG-V
Gas Valve Testing and Replacement
(White Rodgers Mechanical)
MAGNET ASSEMBLY TESTING (White Rodgers Mechanical Control)
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 (located on the gas valve) down
during this test.
Using a multimeter capable of measuring millivolts, connect one lead using an alligator clip to the
copper sheath of the thermocouple. Use the second lead of the multimeter to probe the top
terminal located at the back of the gas valve.
Step 2.
Step 3.
Step 4.
ECO (ENERGY CUT OFF) TESTING
Step 1. Disconnect the thermocouple from the
gas valve.
Step 2. Using a multimeter capable of measuring ohms (or
continuity), attach one lead using an alligator clip to the
pilot tube. Insert the other lead fully into the magnet
opening, be sure the lead makes contact only at the top
center of the magnet opening.
DO NOT allow the lead to make contact with the
threaded sides of the opening.
Step 3. If continuity is indicated, the ECO is O.K.. If continuity is not indicated, the ECO has opened, and
the gas valve must be replaced.
With a meter reading of 13 millivolts or greater, rotate the knob of the combination thermostat/gas
valve to the “OFF” position.
The magnet should remain closed for a drop of at least 6 millivolts. You will hear a “snap” or “click”
sound when the magnet opens; if you hear this sound prior to a drop of 6 millivolts, the magnet is
out of specification and the gas valve should be replaced.
Alligator clip to copper
sheath of thermocouple
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