Step 6: Iid Module Test (Power To The Pilot Valve) - A.O. Smith BTR 120-400 Service Handbook

STEP 6: IID MODULE TEST (POWER TO THE PILOT VALVE)

CONDITION:
• 24VAC to module, no pilot.
Using a multimeter, test for 24 VAC between terminal PV and 24 V (GND) on the IID during the 90 second
trial for ignition.
IF
The meter does not read 24 VAC and the IID module
is not between ignition trials:
The meter does read 24 VAC:
22 Servicing should only be performed by a Qualified Service Technician
THEN
• Replace the module.
• Go to Step 7.