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See SERVICE PROCEDURE RG-II
THERMOCOUPLE TESTING
MAGNET ASSEMBLY TESTING (White Rodgers Control)
Step 1. 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 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 multi meter to
probe the top terminal located at the back of the combination thermostat/gas valve.
Probe top terminal on
back of combination
thermostat/gas valve
Alligator clip to copper
sheath of thermocouple
Step 6. With a meter reading of 13 millivolts or greater, rotate knob of combination thermostat/gas valve to the
“OFF” position.
Step 7. The magnet should remain closed for a drop of at least 6 millivolts. You will here 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 combination thermostat/gas valve should be replaced.
MAGNET ASSEMBLY TESTING (Robertshaw Control)
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.
Step 6. With a meter reading of 13 millivolts or greater, rotate knob of combination thermostat/gas valve to the
“OFF” position.
Step 7. The magnet should remain closed for a drop of at least 6 millivolts. You will here 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 combination thermostat/gas valve should be replaced.
SERVICE PROCEDURE RG-V
Combination Thermostat/Gas Valve Testing
and Replacement