A.O. Smith BTX 100 Service Handbook page 23

IGNITER CURRENT TEST AT J5 SOCKET ON CCB
IGNITER CURRENT TEST BEHIND CCB ENCLOSURE
Service Notes:
• The animated lighting bolt Status Icon is visible on the LCd desktop Screen during the Igniter warm up
operating state. See desktop Screen on page 46 and Status Icons on page 47.
• As a visual confirmation that minimum Igniter current is present the Control System will display a check
mark next to the lighting bolt icon on the desktop Screen during the Igniter Warm up operating state.
• Ensure the wiring and connections between the J5 Socket on the CCB and the Burner Adapter are not
broken, pinched or disconnected.
• Ensure there is approximately 120 VAC at the J5 Socket on the CCB during Igniter Warm up.
• It is a good practice to check igniter current when any service or maintenance is being performed.
Igniter current will be approximately 0.60 to 0.70 AC amps when the Igniter is new. Because hot surface
igniters are wearing parts they can cause intermittent ignition failure with age and wear. Replacing the
Igniter when current is lower than 0.55 AC amps is a good preventive maintenance procedure that can
prevent loss of hot water and customer dissatisfaction.
Figure 21
Servicing should only be performed by a Qualified Service Agent 21