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SERVICE PROCEDURE RG-IV
Piezo Igniter, Electrode
Testing and Replacement
Piezo Ignit
er, Electrode Testing and Replacement
With the pilot not in operation (no pilot flame) you can check the Piezo and electrode circuit by viewing pilot thru the
sight glass located on the inner door and observing the spark action.
Step 1. Remove outer jacket door.
Step 2. Repeatedly depress the Piezo igniter while viewing the pilot thru the sight glass. If a spark is present,
the circuit is OK. If there is no spark, proceed to step 3.
Step 3. Remove orange wire from Piezo igniter and install a jumper wire in its place. Hold the other end of the
jumper by the wire insulation or using an insulated tool, next to an unpainted surface such as the feed
line or gas valve and depress the Piezo igniter. If there is a spark, the igniter is OK, the pilot is not
functioning and must be replaced, see SERVICE PROCEDURE RG-III for pilot replacement. If no spark is
present the igniter is not functioning and must be replaced.
Step 4. With orange wire disconnected from Piezo igniter. Using a common screw driver, place blade of screw
driver under Piezo bracket and gently pry bracket from front of combination thermostat/ gas valve and
unhook bracket from rear of combination thermostat/gas valve.
Repeatedly
Depress Piezo
Igniter
Common
Screw Driver
View spark
Action through
Sight glass