User Guide

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.

Step 2. 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 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.

CLOSED CIRCUIT THERMOCOUPLE TESTING (White Rodgers Control)

Probe top terminal on

back of combination

thermostat/gas valve

Alligator clip to copper

sheath of thermocouple

Step 1. Disconnect thermocouple from combination thermostat/gas valve.

Step 2. Connect a thermocouple adaptor

(BWC P/N 239-44642-00, Robertshaw P/N 75036) at the

thermocouple location in the combination thermostat/gas valve.

Step 3. Reconnect thermocouple to adaptor. Make certain all

connections are tight (finger tight plus ¼ turn).

Step 4 Using a multimeter capable of measuring millivolts, connect

one alligator clip to the set screw of the adaptor, and the other

alligator clip to copper portion of the thermocouple.

Step 5. Following the lighting instruction label on the heater, proceed to light the pilot and allow to operate

for three minuets. If the pilot will not stay lit, hold the red reset button (located on the combination

thermostat/gas valve) down during this test.

Step 6. If meter reads 13 mv or higher, the thermocouple is OK. If reading is below 13 mv

replace the thermocouple.

CLOSED CIRCUIT THERMOCOUPLE TESTING (Robertshaw Control)

SERVICE PROCEDURE RG-II

Thermocouple/Thermopile Testing and

Replacement