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SERVICE PROCEDURE RG-II
Thermocouple/Thermopile Testing and
Replacement
CLOSED CIRCUIT THERMOCOUPLE TESTING (White Rodgers Control)
Step 1.
Closed circuit testing is the preferred method for testing thermocouple. 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 combination thermostat/gas valve)
down during this test.
Using a multimeter capable of measuring millivolts, connect one lead
Step 2.
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 combination thermostat/gas valve.
Step 3.
If meter reads 10 mv or higher, the thermocouple is OK. If reading is below 10 mv,
replace the thermocouple.
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