Cause of error code A24

Lost flame signal 3 times during one heat call. 

Solution for error code A24

1. Inspect harness connection flame sensor. Is connection clean and secure? 
Yes: -> 2
No: Replace flame sensor or harness

2. Remove flame sensor. Is rod free of contamination? 
Yes: -> 3
No: Clean or replace flame sensor.

3. Follow operation instructions to initiate boiler operation. Enter installer menu, boiler status, flame signal. Is flame signal greater then 3.7uA? 
Yes: Replace control module 
No: Replace flame sensor and burner.